Bumped version to 2025.8.1 (#2369)

* Fix #2360 - Better shared env/setup handling (#2361)

* Updated Polyscript to its latest

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* changed is_null to a more Pythonic is_none

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

.github/PULL_REQUEST_TEMPLATE.md

@@ -4,12 +4,9 @@
 
 ## Changes
 
-<!-- List the changes done to fix a bug or introduce a new feature.Please note both user-facing changes and changes to internal API's here -->
+<!-- List the technical changes done to fix a bug or introduce a new feature. -->
 
 ## Checklist
 
-<!-- Note: Only user-facing changes require a changelog entry. Internal-only API changes do not require a changelog entry. Changes in documentation do not require a changelog entry. -->
+-   [ ] I have checked `make build` works locally.
-
+-   [ ] I have created / updated documentation for this change (if applicable).
--   [ ] All tests pass locally
--   [ ] I have updated `CHANGELOG.md`
--   [ ] I have created documentation for this(if applicable)

.github/workflows/prepare-release.yml

@@ -7,7 +7,7 @@ on:
 
 defaults:
     run:
-        working-directory: ./pyscript.core
+        working-directory: ./core
 
 jobs:
     prepare-release:
@@ -19,7 +19,22 @@ jobs:
             - name: Install node
               uses: actions/setup-node@v4
               with:
-                  node-version: 18.x
+                  node-version: 20.x
+
+            - name: Python venv
+              run: python -m venv env
+
+            - name: Activate Python
+              run: source env/bin/activate
+
+            - name: Update pip
+              run: pip install --upgrade pip
+
+            - name: Install PyMinifier
+              run: pip install --ignore-requires-python python-minifier
+
+            - name: Install Setuptools
+              run: pip install setuptools
 
             - name: Cache node modules
               uses: actions/cache@v4
@@ -35,14 +50,14 @@ jobs:
                       ${{ runner.os }}-
 
             - name: NPM Install
-              run: npm install && npx playwright install
+              run: npm install && npx playwright install chromium
 
             - name: Build
               run: npm run build
 
             - name: Generate index.html
               working-directory: .
-              run: sed 's#_PATH_#./#' ./public/index.html > ./pyscript.core/dist/index.html
+              run: sed -e 's#_PATH_#./#' -e 's#_DOC_VERSION_#latest#' -e 's#_TAG_VERSION_##' -e 's#_VERSION_#latest#' ./public/index.html > ./core/dist/index.html
 
             - name: Zip dist folder
               run: zip -r -q ./build.zip ./dist

.github/workflows/publish-release.yml

@@ -6,7 +6,7 @@ on:
 
 defaults:
     run:
-        working-directory: ./pyscript.core
+        working-directory: ./core
 
 jobs:
     publish-release:
@@ -21,7 +21,22 @@ jobs:
             - name: Install node
               uses: actions/setup-node@v4
               with:
-                  node-version: 18.x
+                  node-version: 20.x
+
+            - name: Python venv
+              run: python -m venv env
+
+            - name: Activate Python
+              run: source env/bin/activate
+
+            - name: Update pip
+              run: pip install --upgrade pip
+
+            - name: Install PyMinifier
+              run: pip install --ignore-requires-python python-minifier
+
+            - name: Install Setuptools
+              run: pip install setuptools
 
             - name: Cache node modules
               uses: actions/cache@v4
@@ -37,14 +52,14 @@ jobs:
                       ${{ runner.os }}-
 
             - name: npm install
-              run: npm install && npx playwright install
+              run: npm install && npx playwright install chromium
 
             - name: build
               run: npm run build
 
             - name: Generate index.html in snapshot
               working-directory: .
-              run: sed 's#_PATH_#https://pyscript.net/releases/${{ github.ref_name }}/#' ./public/index.html > ./pyscript.core/dist/index.html
+              run: sed -e 's#_PATH_#https://pyscript.net/releases/${{ github.ref_name }}/#' -e 's#_DOC_VERSION_#${{ github.ref_name }}#' -e 's#_TAG_VERSION_#/tag/${{ github.ref_name }}#' -e 's#_VERSION_#${{ github.ref_name }}#' ./public/index.html > ./core/dist/index.html
 
             - name: Generate release.tar from snapshot and put it in dist/
               working-directory: .

.github/workflows/publish-snapshot.yml

@@ -10,7 +10,7 @@ on:
 
 defaults:
     run:
-        working-directory: ./pyscript.core
+        working-directory: ./core
 
 jobs:
     publish-snapshot:
@@ -25,7 +25,22 @@ jobs:
             - name: Install node
               uses: actions/setup-node@v4
               with:
-                  node-version: 18.x
+                  node-version: 20.x
+
+            - name: Python venv
+              run: python -m venv env
+
+            - name: Activate Python
+              run: source env/bin/activate
+
+            - name: Update pip
+              run: pip install --upgrade pip
+
+            - name: Install PyMinifier
+              run: pip install --ignore-requires-python python-minifier
+
+            - name: Install Setuptools
+              run: pip install setuptools
 
             - name: Cache node modules
               uses: actions/cache@v4
@@ -41,7 +56,7 @@ jobs:
                       ${{ runner.os }}-
 
             - name: Install Dependencies
-              run: npm install && npx playwright install
+              run: npm install && npx playwright install chromium
 
             - name: Build Pyscript.core
               run: npm run build
@@ -54,7 +69,7 @@ jobs:
 
             - name: Generate index.html in snapshot
               working-directory: .
-              run: sed 's#_PATH_#https://pyscript.net/snapshots/${{ inputs.snapshot_version }}/#' ./public/index.html > ./pyscript.core/dist/index.html
+              run: sed -e 's#_PATH_#https://pyscript.net/snapshots/${{ inputs.snapshot_version }}/#' -e 's#_DOC_VERSION_#${{ inputs.snapshot_version }}#' -e 's#_TAG_VERSION_#/tag/${{ inputs.snapshot_version }}#' -e 's#_VERSION_#${{ inputs.snapshot_version }}#' ./public/index.html > ./core/dist/index.html
 
             - name: Copy to Snapshot
               run: >

.github/workflows/publish-unstable.yml

@@ -1,11 +1,11 @@
 name: "Publish Unstable"
 
 on:
-    push: # Only run on merges into main that modify files under pyscript.core/ and examples/
+    push: # Only run on merges into main that modify files under core/ and examples/
         branches:
             - main
         paths:
-            - pyscript.core/**
+            - core/**
             - examples/**
 
     workflow_dispatch:
@@ -18,7 +18,7 @@ jobs:
             contents: read
         defaults:
             run:
-                working-directory: ./pyscript.core
+                working-directory: ./core
         steps:
             - name: Checkout
               uses: actions/checkout@v4
@@ -26,7 +26,22 @@ jobs:
             - name: Install node
               uses: actions/setup-node@v4
               with:
-                  node-version: 18.x
+                  node-version: 20.x
+
+            - name: Python venv
+              run: python -m venv env
+
+            - name: Activate Python
+              run: source env/bin/activate
+
+            - name: Update pip
+              run: pip install --upgrade pip
+
+            - name: Install PyMinifier
+              run: pip install --ignore-requires-python python-minifier
+
+            - name: Install Setuptools
+              run: pip install setuptools
 
             - name: Cache node modules
               uses: actions/cache@v4
@@ -42,14 +57,14 @@ jobs:
                       ${{ runner.os }}-
 
             - name: NPM Install
-              run: npm install && npx playwright install
+              run: npm install && npx playwright install chromium
 
             - name: Build
               run: npm run build
 
             - name: Generate index.html in snapshot
               working-directory: .
-              run: sed 's#_PATH_#https://pyscript.net/unstable/#' ./public/index.html > ./pyscript.core/dist/index.html
+              run: sed -e 's#_PATH_#./#' -e 's#_DOC_VERSION_#latest#' -e 's#_TAG_VERSION_##' -e 's#_VERSION_#latest#' ./public/index.html > ./core/dist/index.html
 
             - name: Configure AWS credentials
               uses: aws-actions/configure-aws-credentials@v4

.github/workflows/test.yml

@@ -5,20 +5,20 @@ on:
         branches:
             - main
         paths:
-            - pyscript.core/**
+            - core/**
             - .github/workflows/test.yml
 
     pull_request: # Only run on merges into main that modify certain files
         branches:
             - main
         paths:
-            - pyscript.core/**
+            - core/**
             - .github/workflows/test.yml
     workflow_dispatch:
 
 jobs:
     BuildAndTest:
-        runs-on: ubuntu-latest-8core
+        runs-on: ubuntu-latest
         env:
             MINICONDA_PYTHON_VERSION: py38
             MINICONDA_VERSION: 4.11.0
@@ -69,24 +69,12 @@ jobs:
                   make setup
 
             - name: Build
-              run: make build
+              run: make build # Integration tests run in the build step.
-
-            - name: Integration Tests
-              #run: make test-integration-parallel
-              run: |
-                  make test-integration
 
             - uses: actions/upload-artifact@v4
               with:
                   name: pyscript
                   path: |
-                      pyscript.core/dist/
+                      core/dist/
                   if-no-files-found: error
                   retention-days: 7
-
-            - uses: actions/upload-artifact@v4
-              if: success() || failure()
-              with:
-                  name: test_results
-                  path: test_results/
-                  if-no-files-found: error

.github/workflows/test_report.yml

@@ -1,16 +0,0 @@
-name: Test Report
-on:
-    workflow_run:
-        workflows: ['\[CI\] Test']
-        types:
-            - completed
-jobs:
-    report:
-        runs-on: ubuntu-latest-8core
-        steps:
-            - uses: dorny/test-reporter@v1.9.0
-              with:
-                  artifact: test_results
-                  name: Test reports
-                  path: "*.xml"
-                  reporter: java-junit

.gitignore

@@ -142,11 +142,11 @@ coverage/
 test_results
 
 # @pyscript/core npm artifacts
-pyscript.core/test-results/*
+core/test-results/*
-pyscript.core/core.*
+core/core.*
-pyscript.core/dist
+core/dist
-pyscript.core/dist.zip
+core/dist.zip
-pyscript.core/src/plugins.js
+core/src/plugins.js
-pyscript.core/src/stdlib/pyscript.js
+core/src/stdlib/pyscript.js
-pyscript.core/src/3rd-party/*
+core/src/3rd-party/*
-!pyscript.core/src/3rd-party/READMEmd
+!core/src/3rd-party/READMEmd

.pre-commit-config.yaml

@@ -4,10 +4,10 @@ ci:
     #skip: [eslint]
     autoupdate_schedule: monthly
 
-default_stages: [commit]
+default_stages: [pre-commit]
 repos:
     - repo: https://github.com/pre-commit/pre-commit-hooks
-      rev: v4.6.0
+      rev: v5.0.0
       hooks:
           - id: check-builtin-literals
           - id: check-case-conflict
@@ -21,33 +21,33 @@ repos:
           - id: check-yaml
           - id: detect-private-key
           - id: end-of-file-fixer
-            exclude: pyscript\.core/dist|\.min\.js$
+            exclude: core/dist|\.min\.js$
           - id: trailing-whitespace
 
     - repo: https://github.com/psf/black
-      rev: 24.4.2
+      rev: 25.1.0
       hooks:
           - id: black
-            exclude: pyscript\.core/src/stdlib/pyscript/__init__\.py
+            exclude: core/tests
+            args: ["-l", "88", "--skip-string-normalization"]
 
     - repo: https://github.com/codespell-project/codespell
-      rev: v2.3.0
+      rev: v2.4.1
       hooks:
           - id: codespell # See 'pyproject.toml' for args
-            exclude: \.js\.map$
+            exclude: fs\.py|\.js\.map$
             additional_dependencies:
                 - tomli
 
+    - repo: https://github.com/astral-sh/ruff-pre-commit
+      rev: v0.11.8
+      hooks:
+          - id: ruff
+            exclude: core/tests
+
     - repo: https://github.com/hoodmane/pyscript-prettier-precommit
       rev: "v3.0.0-alpha.6"
       hooks:
           - id: prettier
-            exclude: pyscript\.core/test|pyscript\.core/dist|pyscript\.core/types|pyscript.core/src/stdlib/pyscript.js|pyscript\.sw/|pyscript.core/src/3rd-party
+            exclude: core/tests|core/dist|core/types|core/src/stdlib/pyscript.js|pyscript\.sw/|core/src/3rd-party
             args: [--tab-width, "4"]
-
-    - repo: https://github.com/pycqa/isort
-      rev: 5.13.2
-      hooks:
-          - id: isort
-            name: isort (python)
-            args: [--profile, black]

.prettierignore

@@ -1,5 +1,4 @@
 ISSUE_TEMPLATE
 *.min.*
 package-lock.json
-docs
+bridge/
-examples/panel.html

.readthedocs.yml

@@ -1,28 +0,0 @@
-# .readthedocs.yaml
-# Read the Docs configuration file
-# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
-
-# Required
-version: 2
-
-# Set the version of Python and other tools you might need
-build:
-    os: ubuntu-20.04
-    tools:
-        python: miniconda3-4.7
-
-# Build documentation in the docs/ directory with Sphinx
-sphinx:
-    configuration: docs/conf.py
-
-conda:
-    environment: docs/environment.yml
-
-# If using Sphinx, optionally build your docs in additional formats such as PDF
-# formats:
-#    - pdf
-
-# Optionally declare the Python requirements required to build your docs
-python:
-    install:
-        - requirements: docs/requirements.txt

CHANGELOG.md

@@ -1,97 +0,0 @@
-# Release Notes
-
-## 2024.05.21
-
-### Features
-
-### Bug fixes
-
-### Enhancements
-
--   `py-editor` run buttons now display a spinner when disabled, which occurs when the editor is running code.
-
-## 2023.05.01
-
-### Features
-
--   Added the `xterm` attribute to `py-config`. When set to `True` or `xterm`, an (output-only) [xterm.js](http://xtermjs.org/) terminal will be used in place of the default py-terminal.
--   The default version of Pyodide is now `0.23.2`. See the [Pyodide Changelog](https://pyodide.org/en/stable/project/changelog.html#version-0-23-2) for a detailed list of changes.
--   Added the `@when` decorator for attaching Python functions as event handlers
--   The `py-mount` attribute on HTML elements has been deprecated, and will be removed in a future release.
-
-#### Runtime py- attributes
-
--   Added logic to react to `py-*` attributes changes, removal, `py-*` attributes added to already live nodes but also `py-*` attributes added or defined via injected nodes (either appended or via `innerHTML` operations). ([#1435](https://github.com/pyscript/pyscript/pull/1435))
-
-#### <script type="py">
-
--   Added the ability to optionally use `<script type="py">`, `<script type="pyscript">` or `<script type="py-script">` instead of a `<py-script>` custom element, in order to tackle cases where the content of the `<py-script>` tag, inevitably parsed by browsers, could accidentally contain _HTML_ able to break the surrounding page layout. ([#1396](https://github.com/pyscript/pyscript/pull/1396))
-
-#### &lt;py-terminal&gt;
-
--   Added a `docked` field and attribute for the `<py-terminal>` custom element, enabled by default when the terminal is in `auto` mode, and able to dock the terminal at the bottom of the page with auto scroll on new code execution.
-
-#### &lt;py-script&gt;
-
--   Restored the `output` attribute of `py-script` tags to route `sys.stdout` to a DOM element with the given ID. ([#1063](https://github.com/pyscript/pyscript/pull/1063))
--   Added a `stderr` attribute of `py-script` tags to route `sys.stderr` to a DOM element with the given ID. ([#1063](https://github.com/pyscript/pyscript/pull/1063))
-
-#### &lt;py-repl&gt;
-
--   The `output` attribute of `py-repl` tags now specifies the id of the DOM element that `sys.stdout`, `sys.stderr`, and the results of a REPL execution are written to. It no longer affects the location of calls to `display()`
--   Added a `stderr` attribute of `py-repl` tags to route `sys.stderr` to a DOM element with the given ID. ([#1106](https://github.com/pyscript/pyscript/pull/1106))
--   Resored the `output-mode` attribute of `py-repl` tags. If `output-mode` == 'append', the DOM element where output is printed is _not_ cleared before writing new results.
--   Load code from the attribute src of py-repl and preload it into the corresponding py-repl tag by use the attribute `str` in your `py-repl` tag([#1292](https://github.com/pyscript/pyscript/pull/1292))
--   &lt;py-repl&gt; elements now have a `getPySrc()` method, which returns the code inside the REPL as a string.([#1516](https://github.com/pyscript/pyscript/pull/1292))
-
-#### Plugins
-
--   Plugins may now implement the `beforePyReplExec()` and `afterPyReplExec()` hooks, which are called immediately before and after code in a `py-repl` tag is executed. ([#1106](https://github.com/pyscript/pyscript/pull/1106))
-
-#### Web worker support
-
--   introduced the new experimental `execution_thread` config option: if you set `execution_thread = "worker"`, the python interpreter runs inside a web worker
--   worker support is still **very** experimental: not everything works, use it at your own risk
-
-### Bug fixes
-
--   Fixes [#1280](https://github.com/pyscript/pyscript/issues/1280), which describes the errors on the PyRepl tests related to having auto-gen tags that shouldn't be there.
-
-### Enhancements
-
--   Py-REPL tests now run on both osx and non osx OSs
--   migrated from _rollup_ to _esbuild_ to create artifacts
--   updated `@codemirror` dependency to its latest
-
-### Docs
-
--   Add docs for event handlers
-
-## 2023.03.1
-
-### Features
-
-### Bug fixes
-
--   Fixed an issue where `pyscript` would not be available when using the minified version of PyScript. ([#1054](https://github.com/pyscript/pyscript/pull/1054))
--   Fixed missing closing tag when rendering an image with `display`. ([#1058](https://github.com/pyscript/pyscript/pull/1058))
--   Fixed a bug where Python plugins methods were being executed twice. ([#1064](https://github.com/pyscript/pyscript/pull/1064))
-
-### Enhancements
-
--   When adding a `py-` attribute to an element but didn't added an `id` attribute, PyScript will now generate a random ID for the element instead of throwing an error which caused the splash screen to not shutdown. ([#1122](https://github.com/pyscript/pyscript/pull/1122))
--   You can now disable the splashscreen by setting `enabled = false` in your `py-config` under the `[splashscreen]` configuration section. ([#1138](https://github.com/pyscript/pyscript/pull/1138))
-
-### Documentation
-
--   Fixed 'Direct usage of document is deprecated' warning in the getting started guide. ([#1052](https://github.com/pyscript/pyscript/pull/1052))
--   Added reference documentation for the `py-splashscreen` plugin ([#1138](https://github.com/pyscript/pyscript/pull/1138))
--   Adds doc for installing tests ([#1156](https://github.com/pyscript/pyscript/pull/1156))
--   Adds docs for custom Pyscript attributes (`py-*`) that allow you to add event listeners to an element ([#1125](https://github.com/pyscript/pyscript/pull/1125))
-
-### Deprecations and Removals
-
--   The py-config `runtimes` to specify an interpreter has been deprecated. The `interpreters` config should be used instead. ([#1082](https://github.com/pyscript/pyscript/pull/1082))
--   The attributes `pys-onClick` and `pys-onKeyDown` have been deprecated, but the warning was only shown in the console. An alert banner will now be shown on the page if the attributes are used. They will be removed in the next release. ([#1084](https://github.com/pyscript/pyscript/pull/1084))
--   The pyscript elements `py-button`, `py-inputbox`, `py-box` and `py-title` have now completed their deprecation cycle and have been removed. ([#1084](https://github.com/pyscript/pyscript/pull/1084))
--   The attributes `pys-onClick` and `pys-onKeyDown` have been removed. Use `py-click` and `py-keydown` instead ([#1361](https://github.com/pyscript/pyscript/pull/1361))

CONTRIBUTING.md

@@ -1,181 +1,4 @@
 # Contributing to PyScript
 
-Thank you for wanting to contribute to the PyScript project!
+Please see our guide to contributing to PyScript
-
+[in our documentation](https://docs.pyscript.net/latest/contributing/).
-## Table of contents
-
--   [Contributing to PyScript](#contributing-to-pyscript)
-    -   [Table of contents](#table-of-contents)
--   [Code of Conduct](#code-of-conduct)
--   [Contributing](#contributing)
-    -   [Reporting bugs](#reporting-bugs)
-    -   [Creating useful issues](#creating-useful-issues)
-    -   [Reporting security issues](#reporting-security-issues)
-    -   [Asking questions](#asking-questions)
-    -   [Setting up your local environment and developing](#setting-up-your-local-environment-and-developing)
-    -   [Developing](#developing)
-    -   [Rebasing changes](#rebasing-changes)
-    -   [Building the docs](#building-the-docs)
-    -   [Places to start](#places-to-start)
-    -   [Setting up your local environment and developing](#setting-up-your-local-environment-and-developing)
-    -   [Submitting a change](#submitting-a-change)
--   [License terms for contributions](#license-terms-for-contributions)
--   [Becoming a maintainer](#becoming-a-maintainer)
--   [Trademarks](#trademarks)
-
-# Code of Conduct
-
-The [PyScript Code of Conduct](https://github.com/pyscript/governance/blob/main/CODE-OF-CONDUCT.md) governs the project and everyone participating in it. By participating, you are expected to uphold this code. Please report unacceptable behavior to the maintainers or administrators as described in that document.
-
-# Contributing
-
-## Reporting bugs
-
-Bugs are tracked on the [project issues page](https://github.com/pyscript/pyscript/issues). Please check if your issue has already been filed by someone else by searching the existing issues before filing a new one. Once your issue is filed, it will be triaged by another contributor or maintainer. If there are questions raised about your issue, please respond promptly.
-
-## Creating useful issues
-
--   Use a clear and descriptive title.
--   Describe the specific steps that reproduce the problem with as many details as possible so that someone can verify the issue.
--   Describe the behavior you observed, and the behavior you had expected.
--   Include screenshots if they help make the issue clear.
-
-## Reporting security issues
-
-If you aren't confident that it is appropriate to submit a security issue using the above process, you can e-mail it to security@pyscript.net
-
-## Asking questions
-
-If you have questions about the project, using PyScript, or anything else, please ask in the [PyScript forum](https://community.anaconda.cloud/c/tech-topics/pyscript).
-
-## Places to start
-
-If you would like to contribute to PyScript, but you aren't sure where to begin, here are some suggestions:
-
--   **Read over the existing documentation.** Are there things missing, or could they be clearer? Make some changes/additions to those documents.
--   **Review the open issues.** Are they clear? Can you reproduce them? You can add comments, clarifications, or additions to those issues. If you think you have an idea of how to address the issue, submit a fix!
--   **Look over the open pull requests.** Do you have comments or suggestions for the proposed changes? Add them.
--   **Check out the examples.** Is there a use case that would be good to have sample code for? Create an example for it.
-
-## Setting up your local environment and developing
-
-If you would like to contribute to PyScript, you will need to set up a local development environment. The [following instructions](https://docs.pyscript.net/latest/contributing/#set-up-your-development-environment) will help you get started.
-
-You can also read about PyScript's [development process](https://docs.pyscript.net/latest/developers/) to learn how to contribute code to PyScript, how to run tests and what's the PR etiquette of the community!
-
-## License terms for contributions
-
-This Project welcomes contributions, suggestions, and feedback. All contributions, suggestions, and feedback you submitted are accepted under the [Apache 2.0](./LICENSE) license. You represent that if you do not own copyright in the code that you have the authority to submit it under the [Apache 2.0](./LICENSE) license. All feedback, suggestions, or contributions are not confidential.
-
-## Becoming a maintainer
-
-Contributors are invited to be maintainers of the project by demonstrating good decision making in their contributions, a commitment to the goals of the project, and consistent adherence to the [code of conduct](https://github.com/pyscript/governance/blob/main/CODE-OF-CONDUCT.md). New maintainers are invited by a 3/4 vote of the existing maintainers.
-
-## Trademarks
-
-The Project abides by the Organization's [trademark policy](https://github.com/pyscript/governance/blob/main/TRADEMARKS.md).
-
----
-
-Part of MVG-0.1-beta.
-Made with love by GitHub. Licensed under the [CC-BY 4.0 License](https://creativecommons.org/licenses/by-sa/4.0/).
-
-# Quick guide to pytest
-
-We make heavy usage of pytest. Here is a quick guide and collection of useful options:
-
--   To run all tests in the current directory and subdirectories: pytest
-
--   To run tests in a specific directory or file: pytest path/to/dir/test_foo.py
-
--   -s: disables output capturing
-
--   --pdb: in case of exception, enter a (Pdb) prompt so that you can inspect what went wrong.
-
--   -v: verbose mode
-
--   -x: stop the execution as soon as one test fails
-
--   -k foo: run only the tests whose full name contains foo
-
--   -k 'foo and bar'
-
--   -k 'foo and not bar'
-
-## Running integration tests under pytest
-
-make test is useful to run all the tests, but during the development is useful to have more control on how tests are run. The following guide assumes that you are in the directory pyscriptjs/tests/integration/.
-
-### To run all the integration tests, single or multi core
-
-$ pytest -xv
-...
-
-test_00_support.py::TestSupport::test_basic[chromium] PASSED [ 0%]
-test_00_support.py::TestSupport::test_console[chromium] PASSED [ 1%]
-test_00_support.py::TestSupport::test_check_js_errors_simple[chromium] PASSED [ 2%]
-test_00_support.py::TestSupport::test_check_js_errors_expected[chromium] PASSED [ 3%]
-test_00_support.py::TestSupport::test_check_js_errors_expected_but_didnt_raise[chromium] PASSED [ 4%]
-test_00_support.py::TestSupport::test_check_js_errors_multiple[chromium] PASSED [ 5%]
-...
-
--x means "stop at the first failure". -v means "verbose", so that you can see all the test names one by one. We try to keep tests in a reasonable order, from most basic to most complex. This way, if you introduced some bug in very basic things, you will notice immediately.
-
-If you have the pytest-xdist plugin installed, you can run all the integration tests on 4 cores in parallel:
-
-$ pytest -n 4
-
-### To run a single test, headless
-
-$ pytest test_01_basic.py -k test_pyscript_hello -s
-...
-[ 0.00 page.goto ] pyscript_hello.html
-[ 0.01 request ] 200 - fake_server - http://fake_server/pyscript_hello.html
-...
-[ 0.17 console.info ] [py-loader] Downloading pyodide-x.y.z...
-[ 0.18 request ] 200 - CACHED - https://cdn.jsdelivr.net/pyodide/vx.y.z/full/pyodide.js
-...
-[ 3.59 console.info ] [pyscript/main] PyScript page fully initialized
-[ 3.60 console.log ] hello pyscript
-
--k selects tests by pattern matching as described above. -s instructs pytest to show the output to the terminal instead of capturing it. In the output you can see various useful things, including network requests and JS console messages.
-
-### To run a single test, headed
-
-$ pytest test_01_basic.py -k test_pyscript_hello -s --headed
-...
-
-Same as above, but with --headed the browser is shown in a window, and you can interact with it. The browser uses a fake server, which means that HTTP requests are cached.
-
-Unfortunately, in this mode source maps does not seem to work, and you cannot debug the original typescript source code. This seems to be a bug in playwright, for which we have a workaround:
-
-$ pytest test_01_basic.py -k test_pyscript_hello -s --headed --no-fake-server
-...
-
-As the name implies, -no-fake-server disables the fake server: HTTP requests are not cached, but source-level debugging works.
-
-Finally:
-
-$ pytest test_01_basic.py -k test_pyscript_hello -s --dev
-...
-
---dev implies --headed --no-fake-server. In addition, it also automatically open chrome dev tools.
-
-### To run only main thread or worker tests
-
-By default, we run each test twice: one with execution_thread = "main" and one with execution_thread = "worker". If you want to run only half of them, you can use -m:
-
-$ pytest -m main # run only the tests in the main thread
-$ pytest -m worker # ron only the tests in the web worker
-
-## Fake server, HTTP cache
-
-By default, our test machinery uses a playwright router which intercepts and cache HTTP requests, so that for example you don't have to download pyodide again and again. This also enables the possibility of running tests in parallel on multiple cores.
-
-The cache is stored using the pytest-cache plugin, which means that it survives across sessions.
-
-If you want to temporarily disable the cache, the easiest thing is to use --no-fake-server, which bypasses it completely.
-
-If you want to clear the cache, you can use the special option --clear-http-cache:
-
-NOTE: this works only if you are inside tests/integration, or if you explicitly specify tests/integration from the command line. This is due to how pytest decides to search for and load the various conftest.py.

Makefile

@@ -9,10 +9,11 @@ PY_OK        := $(shell python3 -c "print(int($(PY3_VER) >= $(MIN_PY3_VER)))")
 all:
 	@echo "\nThere is no default Makefile target right now. Try:\n"
 	@echo "make setup - check your environment and install the dependencies."
+	@echo "make update - update dependencies."
 	@echo "make clean - clean up auto-generated assets."
 	@echo "make build - build PyScript."
 	@echo "make precommit-check - run the precommit checks (run eslint)."
-	@echo "make test-integration - run all integration tests sequentially."
+	@echo "make test - run all automated tests in playwright."
 	@echo "make fmt - format the code."
 	@echo "make fmt-check - check the code formatting.\n"
 
@@ -39,13 +40,12 @@ check-python:
 
 # Check the environment, install the dependencies.
 setup: check-node check-npm check-python
-	cd pyscript.core && npm install && cd ..
+	cd core && npm ci && cd ..
-ifeq ($(VIRTUAL_ENV),)
+ifeq (,$(VIRTUAL_ENV)$(CONDA_PREFIX))
-	echo "\n\n\033[0;31mCannot install Python dependencies. Your virtualenv is not activated.\033[0m"
+	echo "\n\n\033[0;31mCannot install Python dependencies. Your virtualenv or conda env is not activated.\033[0m"
 	false
 else
 	python -m pip install -r requirements.txt
-	playwright install
 endif
 
 # Clean up generated assets.
@@ -55,22 +55,24 @@ clean:
 	rm -rf .pytest_cache .coverage coverage.xml
 
 # Build PyScript.
-build:
+build: precommit-check
-	cd pyscript.core && npx playwright install && npm run build
+	cd core && npx playwright install chromium && npm run build
+
+# Update the dependencies.
+update:
+	python -m pip install -r requirements.txt --upgrade
 
 # Run the precommit checks (run eslint).
 precommit-check:
 	pre-commit run --all-files
 
-# Run all integration tests sequentially.
+# Run all automated tests in playwright.
-test-integration:
+test:
-	mkdir -p test_results
+	cd core && npm run test:integration
-	pytest -vv $(ARGS) pyscript.core/tests/integration/ --log-cli-level=warning --junitxml=test_results/integration.xml
 
-# Run all integration tests in parallel.
+# Serve the repository with the correct headers.
-test-integration-parallel:
+serve:
-	mkdir -p test_results
+	npx mini-coi .
-	pytest --numprocesses auto -vv $(ARGS) pyscript.core/tests/integration/ --log-cli-level=warning --junitxml=test_results/integration.xml
 
 # Format the code.
 fmt: fmt-py
@@ -83,7 +85,6 @@ fmt-check: fmt-py-check
 # Format Python code.
 fmt-py:
 	black -l 88 --skip-string-normalization .
-	isort --profile black .
 
 # Check the format of Python code.
 fmt-py-check:

README.md

@@ -1,95 +1,94 @@
 # PyScript
 
-## What is PyScript
+## PyScript is an open source platform for Python in the browser.
 
-### Summary
+Using PyScript is as simple as:
 
-PyScript is a framework that allows users to create rich Python applications in the browser using HTML's interface and the power of [Pyodide](https://pyodide.org/en/stable/), [MicroPython](https://micropython.org/) and [WASM](https://webassembly.org/), and modern web technologies.
+```html
+<!doctype html>
+<html lang="en">
+    <head>
+        <meta charset="utf-8" />
+        <meta name="viewport" content="width=device-width,initial-scale=1" />
+        <title>PyScript!</title>
+        <link
+            rel="stylesheet"
+            href="https://pyscript.net/releases/2025.8.1/core.css"
+        />
+        <script
+            type="module"
+            src="https://pyscript.net/releases/2025.8.1/core.js"
+        ></script>
+    </head>
+    <body>
+        <!-- type mpy (MicroPython) or py (Pyodide) to run some Python -->
+        <script type="mpy" terminal>
+            print("Hello, world!")
+        </script>
+    </body>
+</html>
+```
 
-To get started see the [Beginning PyScript tutorial](https://docs.pyscript.net/latest/beginning-pyscript/).
+PyScript enables the creation of rich Python applications in the browser using
+[Pyodide](https://pyodide.org/en/stable/) (a version of
+[CPython](https://python.org/)), [MicroPython](https://micropython.org/),
+[WASM](https://webassembly.org/), and modern web technologies. It means Python
+now runs anywhere a browser runs: desktop, laptop, mobile, tablet, or any other
+browser enabled device.
 
-For examples see [here](https://pyscript.com/@examples).
+To start building, read the
+[Beginning PyScript tutorial](https://docs.pyscript.net/latest/beginning-pyscript/).
+
+For example applications, see [here](https://pyscript.com/@examples).
 
 Other useful resources:
 
+-   Our [Home Page](https://pyscript.net/) as an open source project.
 -   The [official technical docs](https://docs.pyscript.net/).
--   Our current [Home Page](https://pyscript.net/) on the web.
+-   A [YouTube channel](https://www.youtube.com/@PyScriptTV) with helpful videos
--   A free-to-use [online editor](https://pyscript.com/) for trying PyScript.
+    and community content.
--   Our community [Discord Channel](https://discord.gg/BYB2kvyFwm), to keep in touch .
+-   A free-to-use [online IDE](https://pyscript.com/) for trying PyScript.
+-   Our community [Discord Channel](https://discord.gg/BYB2kvyFwm), to keep in
+    touch .
 
-Every Tuesday at 15:30 UTC there is the _PyScript Community Call_ on zoom, where we can talk about PyScript development in the open. Most of the maintainers regularly participate in the call, and everybody is welcome to join.
+Every Tuesday at 15:30 UTC there is the _PyScript Community Call_ on zoom,
+where we can talk about PyScript development in the open. Most of the
+maintainers regularly participate in the call, and everybody is welcome to
+join. This meeting is recorded and uploaded to our YouTube channel.
 
-Every other Thursday at 16:00 UTC there is the _PyScript FUN_ call: this is a call in which everybody is encouraged to show what they did with PyScript.
+Every other Thursday at 16:00 UTC there is the _PyScript FUN_ call: the focus
+of this call is to share fun projects, goofy hacks or clever uses of PyScript.
+It's a supportive, energetic and entertaining meeting. This meeting is also
+recorded and uploaded to our YouTube channel.
 
-For more details on how to join the calls and up to date schedule, consult the official calendar:
+For more details on how to join the calls and up to date schedule, consult the
+official calendar:
 
 -   [Google calendar](https://calendar.google.com/calendar/u/0/embed?src=d3afdd81f9c132a8c8f3290f5cc5966adebdf61017fca784eef0f6be9fd519e0@group.calendar.google.com&ctz=UTC) in UTC time;
 -   [iCal format](https://calendar.google.com/calendar/ical/d3afdd81f9c132a8c8f3290f5cc5966adebdf61017fca784eef0f6be9fd519e0%40group.calendar.google.com/public/basic.ics).
 
-### Longer Version
+## Contribute
 
-PyScript is a meta project that aims to combine multiple open technologies into a framework that allows users to create sophisticated browser applications with Python. It integrates seamlessly with the way the DOM works in the browser and allows users to add Python logic in a way that feels natural both to web and Python developers.
+For technical details of the code, please see the [README](core/README.md) in
+the `core` directory.
 
-## Try PyScript
+Read the [contributing guide](https://docs.pyscript.net/latest/contributing/)
+to learn about our development process, reporting bugs and improvements,
+creating issues and asking questions.
 
-To try PyScript, import the appropriate pyscript files into the `<head>` tag of your html page:
+Check out the [development process](https://docs.pyscript.net/latest/developers/)
-
+documentation for more information on how to setup your development environment.
-```html
-<head>
-    <link
-        rel="stylesheet"
-        href="https://pyscript.net/releases/2024.6.2/core.css"
-    />
-    <script
-        type="module"
-        src="https://pyscript.net/releases/2024.6.2/core.js"
-    ></script>
-</head>
-<body>
-    <script type="py" terminal>
-        from pyscript import display
-        display("Hello World!") # this goes to the DOM
-        print("Hello terminal") # this goes to the terminal
-    </script>
-</body>
-```
-
-You can then use PyScript components in your html page. PyScript currently offers various ways of running Python code:
-
--   `<script type="py">`: can be used to define python code that is executable within the web page.
--   `<script type="py" src="hello.py">`: same as above, but the python source is fetched from the given URL.
--   `<script type="py" terminal>`: same as above, but also creates a terminal where to display stdout and stderr (e.g., the output of `print()`); `input()` does not work.
--   `<script type="py" terminal worker>`: run Python inside a web worker: the terminal is fully functional and `input()` works.
--   `<py-script>`: same as `<script type="py">`, but it is not recommended because if the code contains HTML tags, they could be parsed wrongly.
--   `<script type="mpy">`: same as above but use MicroPython instead of Python.
-
-Check out the [official docs](https://docs.pyscript.net/) for more detailed documentation.
-
-## How to Contribute
-
-Read the [contributing guide](https://docs.pyscript.net/latest/contributing/) to learn about our development process, reporting bugs and improvements, creating issues and asking questions.
-
-Check out the [developing process](https://docs.pyscript.net/latest/developers/) documentation for more information on how to setup your development environment.
 
 ## Governance
 
-The [PyScript organization governance](https://github.com/pyscript/governance) is documented in a separate repository.
+The [PyScript organization governance](https://github.com/pyscript/governance)
+is documented in a separate repository.
 
-## Release
+## Supporters
 
-To cut a new release of PyScript simply
+PyScript is an independent open source project.
-[add a new release](https://github.com/pyscript/pyscript/releases) while
-remembering to write a comprehensive changelog. A [GitHub action](https://github.com/pyscript/pyscript/blob/main/.github/workflows/publish-release.yml)
-will kick in and ensure the release is described and deployed to a URL with the
-pattern: https://pyscript.net/releases/YYYY.M.v/ (year/month/version - as per
-our [CalVer](https://calver.org/) versioning scheme).
 
-Then, the following three separate repositories need updating:
+However, PyScript was born at [Anaconda Inc](https://anaconda.com/) and its
-
+core contributors are currently employed by Anaconda to work on PyScript. We
--   [Documentation](https://github.com/pyscript/docs) - Change the `version.json`
+would like to acknowledge and celebrate Anaconda's continued support of this
-    file in the root of the directory and then `node version-update.js`.
+project. Thank you [Anaconda Inc](https://anaconda.com/)!
--   [Homepage](https://github.com/pyscript/pyscript.net) - Ensure the version
-    referenced in `index.html` is the latest version.
--   [PSDC](https://pyscript.com) - Use discord or Anaconda Slack (if you work at
-    Anaconda) to let the PSDC team know there's a new version, so they can update
-    their project templates.

TROUBLESHOOTING.md

@@ -1,19 +0,0 @@
-# Troubleshooting
-
-This page is meant for troubleshooting common problems with PyScript.
-
-## Table of contents:
-
--   [Make Setup](#make-setup)
-
-## Make setup
-
-A lot of problems related to `make setup` are related to node and npm being outdated. Once npm and node are updated, `make setup` should work. You can follow the steps on the [npm documentation](https://docs.npmjs.com/try-the-latest-stable-version-of-npm) to update npm (the update command for Linux should work for Mac as well). Once npm has been updated you can continue to the instructions to update node below.
-
-To update Node run the following commands in order (Most likely you'll be prompted for your user password, this is normal):
-
-```
-sudo npm cache clean -f
-sudo npm install -g n
-sudo n stable
-```

bridge/README.md

@@ -0,0 +1,57 @@
+# @pyscript/bridge
+
+Import Python utilities directly in JS
+
+```js
+// main thread
+const { ffi: { func_a, func_b } } = await import('./test.js');
+
+// test.js
+import bridge from 'https://esm.run/@pyscript/bridge';
+export const ffi = bridge(import.meta.url, { type: 'mpy', worker: false });
+
+// test.py
+def func_a(value):
+    print(f"hello {value}")
+
+def func_b():
+    import sys
+    return sys.version
+```
+
+### Options
+
+  * **type**: `py` by default to bootstrap *Pyodide*.
+  * **worker**: `true` by default to bootstrap in a *Web Worker*.
+  * **config**: either a *string* or a PyScript compatible config *JS literal* to make it possible to bootstrap files and whatnot. If specified, the `worker` becomes implicitly `true` to avoid multiple configs conflicting on the main thread.
+  * **env**: to share the same environment across multiple modules loaded at different times.
+
+
+## Tests
+
+Run `npx mini-coi .` within this folder to then reach out `http://localhost:8080/test/` that will show:
+
+```
+PyScript Bridge
+------------------
+no config
+```
+
+The [test.js](./test/test.js) files uses the following defaults:
+
+  * `type` as `"mpy"`
+  * `worker` as `false`
+  * `config` as `undefined`
+  * `env` as `undefined`
+
+To test any variant use query string parameters so that `?type=py` will use `py` instead, `worker` will use a worker and `config` will use a basic *config* that brings in another file from the same folder which exposes the version.
+
+To recap: `http://localhost:8080/test/?type=py&worker&config` will show this instead:
+
+```
+PyScript Bridge
+------------------
+3.12.7 (main, May 15 2025, 18:47:24) ...
+```
+
+Please note when a *config* is used, the `worker` attribute is always `true`.

bridge/index.js

@@ -0,0 +1,150 @@
+/*! (c) PyScript Development Team */
+
+const { stringify } = JSON;
+const { create, entries } = Object;
+
+/**
+ * Transform a list of keys into a Python dictionary.
+ * `['a', 'b']` => `{ "a": a, "b": b }`
+ * @param {Iterable<string>} keys
+ * @returns {string}
+ */
+const dictionary = keys => {
+  const fields = [];
+  for (const key of keys)
+    fields.push(`${stringify(key)}: ${key}`);
+  return `{ ${fields.join(',')} }`;
+};
+
+/**
+ * Resolve properly config files relative URLs.
+ * @param {string|Object} config - The configuration to normalize.
+ * @param {string} base - The base URL to resolve relative URLs against.
+ * @returns {string} - The JSON serialized config.
+ */
+const normalize = async (config, base) => {
+  if (typeof config === 'string') {
+    base = config;
+    config = await fetch(config).then(res => res.json());
+  }
+  if (typeof config.files === 'object') {
+    const files = {};
+    for (const [key, value] of entries(config.files)) {
+      files[key.startsWith('{') ? key : new URL(key, base)] = value;
+    }
+    config.files = files;
+  }
+  return stringify(config);
+};
+
+// this logic is based on a 3 levels cache ...
+const cache = new Map;
+
+/**
+ * Return a bridge to a Python module via a `.js` file that has a `.py` alter ego.
+ * @param {string} url - The URL of the JS module that has a Python counterpart.
+ * @param {Object} options - The options for the bridge.
+ * @param {string} [options.type='py'] - The `py` or `mpy` interpreter type, `py` by default.
+ * @param {boolean} [options.worker=true] - Whether to use a worker, `true` by default.
+ * @param {string|Object} [options.config=null] - The configuration for the bridge, `null` by default.
+ * @param {string} [options.env=null] - The optional shared environment to use.
+ * @param {string} [options.serviceWorker=null] - The optional service worker to use as fallback.
+ * @returns {Object} - The bridge to the Python module.
+ */
+export default (url, {
+  type = 'py',
+  worker = true,
+  config = null,
+  env = null,
+  serviceWorker = null,
+} = {}) => {
+  const { protocol, host, pathname } = new URL(url);
+  const py = pathname.replace(/\.m?js(?:\/\+\w+)?$/, '.py');
+  const file = `${protocol}//${host}${py}`;
+
+  // the first cache is about the desired file in the wild ...
+  if (!cache.has(file)) {
+    // the second cache is about all fields one needs to access out there
+    const exports = new Map;
+    let python;
+
+    cache.set(file, new Proxy(create(null), {
+      get(_, field) {
+        if (!exports.has(field)) {
+          // create an async callback once and always return the same later on
+          exports.set(field, async (...args) => {
+            // the third cache is about reaching lazily the code only once
+            // augmenting its content with exports once and drop it on done
+            if (!python) {
+              // do not await or multiple calls will fetch multiple times
+              // just assign the fetch `Promise` once and return it
+              python = fetch(file).then(async response => {
+                const code = await response.text();
+                // create a unique identifier for the Python context
+                const identifier = pathname.replace(/[^a-zA-Z0-9_]/g, '');
+                const name = `__pyscript_${identifier}${Date.now()}`;
+                // create a Python dictionary with all accessed fields
+                const detail = `{"detail":${dictionary(exports.keys())}}`;
+                // create the arguments for the `dispatchEvent` call
+                const eventArgs = `${stringify(name)},${name}to_ts(${detail})`;
+                // bootstrap the script element type and its attributes
+                const script = document.createElement('script');
+                script.type = type;
+
+                // if config is provided it needs to be a worker to avoid
+                // conflicting with main config on the main thread (just like always)
+                script.toggleAttribute('worker', !!config || !!worker);
+                if (config) {
+                  const attribute = await normalize(config, file);
+                  script.setAttribute('config', attribute);
+                }
+
+                if (env) script.setAttribute('env', env);
+                if (serviceWorker) script.setAttribute('service-worker', serviceWorker);
+
+                // augment the code with the previously accessed fields at the end
+                script.textContent = [
+                  '\n', code, '\n',
+                  // this is to avoid local scope name clashing
+                  `from pyscript import window as ${name}`,
+                  `from pyscript.ffi import to_js as ${name}to_ts`,
+                  `${name}.dispatchEvent(${name}.CustomEvent.new(${eventArgs}))`,
+                  // remove these references even if non-clashing to keep
+                  // the local scope clean from undesired entries
+                  `del ${name}`,
+                  `del ${name}to_ts`,
+                ].join('\n');
+
+                // let PyScript resolve and execute this script
+                document.body.appendChild(script);
+
+                // intercept once the unique event identifier with all exports
+                globalThis.addEventListener(
+                  name,
+                  event => {
+                    resolve(event.detail);
+                    script.remove();
+                  },
+                  { once: true }
+                );
+
+                // return a promise that will resolve only once the event
+                // has been emitted and the interpreter evaluated the code
+                const { promise, resolve } = Promise.withResolvers();
+                return promise;
+              });
+            }
+
+            // return the `Promise` that will after invoke the exported field
+            return python.then(foreign => foreign[field](...args));
+          });
+        }
+
+        // return the lazily to be resolved once callback to invoke
+        return exports.get(field);
+      }
+    }));
+  }
+
+  return cache.get(file);
+};

bridge/package.json

@@ -0,0 +1,27 @@
+{
+  "name": "@pyscript/bridge",
+  "version": "0.1.0",
+  "description": "A JS based way to use PyScript modules",
+  "type": "module",
+  "module": "./index.js",
+  "unpkg": "./index.js",
+  "jsdelivr": "./jsdelivr.js",
+  "browser": "./index.js",
+  "main": "./index.js",
+  "keywords": [
+    "PyScript",
+    "JS",
+    "Python",
+    "bridge"
+  ],
+  "author": "Anaconda Inc.",
+  "license": "APACHE-2.0",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/pyscript/pyscript.git"
+  },
+  "bugs": {
+    "url": "https://github.com/pyscript/pyscript/issues"
+  },
+  "homepage": "https://github.com/pyscript/pyscript#readme"
+}

bridge/test/index.html

@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html lang="en">
+    <head>
+        <meta charset="utf-8">
+        <meta name="viewport" content="width=device-width,initial-scale=1">
+        <title>PyScript Bridge</title>
+        <style>body { font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif; }</style>
+        <link rel="stylesheet" href="https://pyscript.net/releases/2025.5.1/core.css" />
+        <script type="module" src="https://pyscript.net/releases/2025.5.1/core.js"></script>
+        <!-- for local testing purpose only-->
+        <script type="importmap">{"imports":{"https://esm.run/@pyscript/bridge":"../index.js"}}</script>
+        <script type="module">
+          const { ffi: { test_func, test_other, version } } = await import('./test.js');
+
+          console.time("⏱️ first invoke");
+          const result = await test_func("PyScript Bridge");
+          console.timeEnd("⏱️ first invoke");
+
+          document.body.append(
+            Object.assign(
+              document.createElement("h3"),
+              { textContent: result },
+            ),
+            document.createElement("hr"),
+            await version(),
+          );
+
+          console.time("⏱️ other invokes");
+          await test_other("🐍");
+          console.timeEnd("⏱️ other invokes");
+        </script>
+    </head>
+</html>

bridge/test/remote/index.html

@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html lang="en">
+    <head>
+        <meta charset="utf-8">
+        <meta name="viewport" content="width=device-width,initial-scale=1">
+        <title>PyScript Bridge</title>
+        <script type="importmap">
+          {
+            "imports": {
+              "https://esm.run/@pyscript/bridge": "https://esm.run/@pyscript/bridge@latest",
+              "https://esm.run/@pyscript/bridge/test/test.js": "https://esm.run/@pyscript/bridge@latest/test/test.js"
+            }
+          }
+        </script>
+        <style>body { font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif; }</style>
+        <link rel="stylesheet" href="https://pyscript.net/releases/2025.5.1/core.css" />
+        <script type="module" src="https://pyscript.net/releases/2025.5.1/core.js"></script>
+        <script type="module">
+          const cdn_test = 'https://esm.run/@pyscript/bridge/test/test.js';
+          const { ffi: { test_func, test_other, version } } = await import(cdn_test);
+
+          console.time("⏱️ first invoke");
+          const result = await test_func("PyScript Bridge");
+          console.timeEnd("⏱️ first invoke");
+
+          document.body.append(
+            Object.assign(
+              document.createElement("h3"),
+              { textContent: result },
+            ),
+            document.createElement("hr"),
+            await version(),
+          );
+
+          console.time("⏱️ other invokes");
+          await test_other("🐍");
+          console.timeEnd("⏱️ other invokes");
+        </script>
+    </head>
+</html>

bridge/test/sys_version.py

@@ -0,0 +1,5 @@
+import sys
+
+
+def version():
+    return sys.version

bridge/test/test.js

@@ -0,0 +1,17 @@
+import bridge from "https://esm.run/@pyscript/bridge";
+
+// for local testing purpose only
+const { searchParams } = new URL(location.href);
+
+// the named (or default) export for test.py
+export const ffi = bridge(import.meta.url, {
+  env: searchParams.get("env"),
+  type: searchParams.get("type") || "mpy",
+  worker: searchParams.has("worker"),
+  config: searchParams.has("config") ?
+    ({
+      files: {
+        "./sys_version.py": "./sys_version.py",
+      },
+    }) : undefined,
+});

bridge/test/test.py

@@ -0,0 +1,22 @@
+from pyscript import config, RUNNING_IN_WORKER
+
+type = config["type"]
+print(f"{type}-script", RUNNING_IN_WORKER and "worker" or "main")
+
+
+def test_func(message):
+    print("Python", message)
+    return message
+
+
+def test_other(message):
+    print("Python", message)
+    return message
+
+
+def version():
+    try:
+        from sys_version import version
+    except ImportError:
+        version = lambda: "no config"
+    return version()

core/LICENSE

@@ -186,10 +186,12 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
+
    Copyright (c) 2022-present, PyScript Development Team
 
    Originated at Anaconda, Inc. in 2022
 
+
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

core/README.md

@@ -0,0 +1,168 @@
+# @pyscript/core
+
+PyScript brings two Python interpreters to the browser:
+
+-   [MicroPython](https://micropython.org/) - a lean and efficient implementation
+    of the Python 3 programming language that includes a small subset of the
+    Python standard library and is optimised to run on microcontrollers and in
+    constrained environments (like the browser).
+-   [Pyodide](https://pyodide.org)) - a port of all CPython to WebAssembly.
+
+These interpreters are compiled to [WebAssembly](https://webassembly.org/)
+(shortened to WASM). The browser provides a secure WASM computing sandbox. Both
+interpreters are compiled to web assembly with
+[Emscripten](https://emscripten.org/). PyScript core maintainers work closely
+with the core maintainers of both MicroPython and Pyodide (and CPython). We
+work hard to ensure PyScript works efficiently in browsers on all platforms:
+desktop, mobile, or elsewhere.
+
+Our technical documentation for using this project can be
+[found here](https://docs.pyscript.net/).
+
+PyScript sits on two further projects (both written in JavaScript):
+
+1. [polyscript](https://github.com/pyscript/polyscript/#readme) - used to
+   bootstrap WASM compiled interpreters in a browser.
+2. [coincident](https://github.com/WebReflection/coincident) - used to simplify
+   worker based tasks.
+
+PyScript itself is mostly written in JavaScript. The test suite for JavaScript
+is in two parts: automated tests run in [playwright](https://playwright.dev/),
+and manual tests you have to run in a browser and check yourself. PyScript also
+has a plugin system so third parties can extend its capabilities with
+JavaScript. Our built-in core plugins can be found in the `src/plugins`
+directory. We describe how to write third party plugins in our
+[developer documentation](https://docs.pyscript.net/latest/user-guide/plugins/).
+
+We provide a `pyscript` namespace containing Python modules for common browser
+based APIs and features (i.e. you can `import pyscript` in Python code running
+inside PyScript, to access these features). The Python code for the `pyscript`
+namespace is in `src/stdlib/pyscript` with the associated test suite in
+`tests/python`. The tests use the browser friendly
+[uPyTest](https://github.com/ntoll/upytest) test framework for checking Python
+code running _within_ PyScript. All the Python tests are run in each each
+available interpreter in both the main thread and a web worker (i.e. the
+test suite is run four times, accounting for each combination of interpreter
+and main/worker context).
+
+When you create a local build all the automated tests (JavaScript and Python)
+are run.
+
+## Developer Guide
+
+Full instructions for setting up a working development environment, how to
+build PyScript and how to test it can be
+[found in our official docs](https://docs.pyscript.net/latest/developers/).
+
+The short version is:
+
+-   Ensure you have Python, node and npm installed.
+-   Create a Python virtual environment.
+-   In the root of this repository `make setup`.
+-   `make build` to build PyScript.
+-   As dependencies change over time, `make update` to keep in sync.
+
+To start using the locally built version of PyScript, you'll need an HTML
+page something like this (note the relative paths to assets in the `dist`
+directory, in the `<head>` of the document):
+
+```html
+<!doctype html>
+<html lang="en">
+    <head>
+        <meta charset="UTF-8" />
+        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+        <title>Pure Python PyScript tests</title>
+        <link rel="stylesheet" href="../../dist/core.css" />
+        <script type="module" src="../../dist/core.js"></script>
+    </head>
+    <body>
+        <script type="mpy" src="./main.py" config="./conf.toml"></script>
+    </body>
+</html>
+```
+
+Once set up, you should be able to run the most common activities via the
+`make` command:
+
+```
+$ make
+
+There is no default Makefile target right now. Try:
+
+make setup - check your environment and install the dependencies.
+make update - update dependencies.
+make clean - clean up auto-generated assets.
+make build - build PyScript.
+make precommit-check - run the precommit checks (run eslint).
+make test - run all automated tests in playwright.
+make fmt - format the code.
+make fmt-check - check the code formatting.
+```
+
+## Artifacts
+
+There are two main artifacts in this project:
+
+-   **stdlib** and its content: `src/stdlib/pyscript.js` exposes, as a
+    JavaScript object literal, all the _Python_ content within the folder
+    (recursively).
+-   **plugins** and its content: `src/plugins.js` exposes all available
+    _dynamic imports_, and is able to instrument the bundler to create files
+    apart from the `_dist/_` folder, so that by default _core_ remains as small
+    as possible.
+
+Accordingly, whenever a file contains this warning at its first line, **please
+do not change such file directly before submitting a merge request**, as that
+file will be overwritten at the next `npm run build` command, either here or
+in _CI_:
+
+```js
+// ⚠️ This file is an artifact: DO NOT MODIFY
+```
+
+## Plugins
+
+While community or third party plugins don't need to be part of this repository
+and can be added just importing `@pyscript/core` as module, there are a few
+plugins that we would like to make available by default and these are
+considered _core plugins_.
+
+To add a _core plugin_ to this project define the plugin entry-point and name
+in the `src/plugins` folder (see the `error.js` example) and create, if
+necessary, a folder with the same name where extra files or dependencies can be
+added.
+
+The _build_ command will include plugins by name as artifacts so that the
+bundler can create ad-hoc files within the `dist/` folder.
+
+## Python
+
+The `pyscript` package available in _Python_ lives in the folder
+`src/stdlib/pyscript/`.
+
+All _Python_ files will be embedded automatically whenever `npm run build`
+happens and reflected into the `src/stdlib/pyscript.js` file.
+
+Its _core_ responsibility is to ensure those files will be available through
+the filesystem in either the _main_ thread, or any _worker_.
+
+## Release
+
+To cut a new release of PyScript simply
+[add a new release](https://github.com/pyscript/pyscript/releases) while
+remembering to write a comprehensive changelog. A
+[GitHub action](https://github.com/pyscript/pyscript/blob/main/.github/workflows/publish-release.yml)
+will kick in and ensure the release is described and deployed to a URL with the
+pattern: https://pyscript.net/releases/YYYY.M.v/ (year/month/version - as per
+our [CalVer](https://calver.org/) versioning scheme).
+
+Then, the following three separate repositories need updating:
+
+-   [Documentation](https://github.com/pyscript/docs) - Change the `version.json`
+    file in the root of the directory and then `node version-update.js`.
+-   [Homepage](https://github.com/pyscript/pyscript.net) - Ensure the version
+    referenced in `index.html` is the latest version.
+-   [PSDC](https://pyscript.com) - Use discord or Anaconda Slack (if you work at
+    Anaconda) to let the PSDC team know there's a new version, so they can update
+    their project templates.

core/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@pyscript/core",
-    "version": "0.5.3",
+    "version": "0.6.70",
     "type": "module",
     "description": "PyScript",
     "module": "./index.js",
@@ -8,27 +8,50 @@
     "jsdelivr": "./jsdelivr.js",
     "browser": "./index.js",
     "main": "./index.js",
+    "engines": {
+        "node": ">=20"
+    },
+    "files": [
+        "./dist/",
+        "./src/",
+        "./types/",
+        "./index.js",
+        "./jsdelivr.js",
+        "LICENSE",
+        "README.md"
+    ],
     "exports": {
         ".": {
             "types": "./types/core.d.ts",
             "import": "./src/core.js"
         },
+        "./js": {
+            "types": "./types/core.d.ts",
+            "import": "./dist/core.js"
+        },
         "./css": {
             "import": "./dist/core.css"
         },
+        "./storage": {
+            "import": "./dist/storage.js"
+        },
+        "./service-worker": {
+            "import": "./dist/service-worker.js"
+        },
         "./package.json": "./package.json"
     },
     "scripts": {
-        "server": "npx static-handler --coi .",
+        "server": "echo \"➡️  TESTS @ $(tput bold)http://localhost:8080/tests/$(tput sgr0)\"; npx static-handler --coi .",
-        "build": "export ESLINT_USE_FLAT_CONFIG=true;npm run build:3rd-party && npm run build:stdlib && npm run build:plugins && npm run build:core && if [ -z \"$NO_MIN\" ]; then eslint src/ && npm run ts && npm run test:mpy; fi",
+        "build": "export ESLINT_USE_FLAT_CONFIG=true;npm run build:3rd-party && npm run build:stdlib && npm run build:plugins && npm run build:core && npm run build:tests-index && if [ -z \"$NO_MIN\" ]; then eslint src/ && npm run test:integration; fi",
         "build:core": "rm -rf dist && rollup --config rollup/core.config.js && cp src/3rd-party/*.css dist/",
         "build:flatted": "node rollup/flatted.cjs",
         "build:plugins": "node rollup/plugins.cjs",
         "build:stdlib": "node rollup/stdlib.cjs",
         "build:3rd-party": "node rollup/3rd-party.cjs",
+        "build:tests-index": "node rollup/build_test_index.cjs",
         "clean:3rd-party": "rm src/3rd-party/*.js && rm src/3rd-party/*.css",
-        "test:mpy": "static-handler --coi . 2>/dev/null & SH_PID=$!; EXIT_CODE=0; playwright test --fully-parallel test/mpy.spec.js || EXIT_CODE=$?; kill $SH_PID 2>/dev/null; exit $EXIT_CODE",
+        "test:integration": "npm run test:ws; static-handler --coi . 2>/dev/null & SH_PID=$!; EXIT_CODE=0; (playwright test tests/js_tests.spec.js && playwright test tests/py_tests.main.spec.js && playwright test tests/py_tests.worker.spec.js) || EXIT_CODE=$?; kill $SH_PID 2>/dev/null; exit $EXIT_CODE",
-        "test:ws": "bun test/ws/index.js & playwright test test/ws.spec.js",
+        "test:ws": "bun tests/javascript/ws/index.js & playwright test tests/javascript/ws/index.spec.js",
         "dev": "node dev.cjs",
         "release": "npm run build && npm run zip",
         "size": "echo -e \"\\033[1mdist/*.js file size\\033[0m\"; for js in $(ls dist/*.js); do cat $js | brotli > ._; echo -e \"\\033[2m$js:\\033[0m $(du -h --apparent-size ._ | sed -e 's/[[:space:]]*._//')\"; rm ._; done",
@@ -43,37 +66,42 @@
     "license": "APACHE-2.0",
     "dependencies": {
         "@ungap/with-resolvers": "^0.1.0",
+        "@webreflection/idb-map": "^0.3.2",
+        "@webreflection/utils": "^0.1.1",
+        "add-promise-listener": "^0.1.3",
         "basic-devtools": "^0.1.6",
-        "polyscript": "^0.15.0",
+        "polyscript": "^0.18.9",
         "sticky-module": "^0.1.1",
         "to-json-callback": "^0.1.1",
         "type-checked-collections": "^0.1.7"
     },
     "devDependencies": {
-        "@codemirror/commands": "^6.6.0",
+        "@codemirror/commands": "^6.8.1",
-        "@codemirror/lang-python": "^6.1.6",
+        "@codemirror/lang-python": "^6.2.1",
-        "@codemirror/language": "^6.10.2",
+        "@codemirror/language": "^6.11.2",
-        "@codemirror/state": "^6.4.1",
+        "@codemirror/state": "^6.5.2",
-        "@codemirror/view": "^6.30.0",
+        "@codemirror/view": "^6.38.1",
-        "@playwright/test": "^1.45.3",
+        "@playwright/test": "^1.54.2",
-        "@rollup/plugin-commonjs": "^26.0.1",
+        "@rollup/plugin-commonjs": "^28.0.6",
-        "@rollup/plugin-node-resolve": "^15.2.3",
+        "@rollup/plugin-node-resolve": "^16.0.1",
         "@rollup/plugin-terser": "^0.4.4",
-        "@webreflection/toml-j0.4": "^1.1.3",
+        "@webreflection/toml-j0.4": "^1.1.4",
         "@xterm/addon-fit": "^0.10.0",
         "@xterm/addon-web-links": "^0.11.0",
-        "bun": "^1.1.21",
+        "@xterm/xterm": "^5.5.0",
-        "chokidar": "^3.6.0",
+        "bun": "^1.2.19",
-        "codemirror": "^6.0.1",
+        "chokidar": "^4.0.3",
-        "eslint": "^9.8.0",
+        "codedent": "^0.1.2",
-        "flatted": "^3.3.1",
+        "codemirror": "^6.0.2",
-        "rollup": "^4.20.0",
+        "eslint": "^9.32.0",
+        "flatted": "^3.3.3",
+        "rollup": "^4.46.2",
         "rollup-plugin-postcss": "^4.0.2",
         "rollup-plugin-string": "^3.0.0",
-        "static-handler": "^0.4.3",
+        "static-handler": "^0.5.3",
-        "typescript": "^5.5.4",
+        "string-width": "^7.2.0",
-        "xterm": "^5.3.0",
+        "typescript": "^5.9.2",
-        "xterm-readline": "^1.1.1"
+        "xterm-readline": "^1.1.2"
     },
     "repository": {
         "type": "git",

core/rollup/3rd-party.cjs

@@ -46,7 +46,7 @@ const modules = {
     "toml.js": join(node_modules, "@webreflection", "toml-j0.4", "toml.js"),
 
     // xterm
-    "xterm.js": resolve("xterm"),
+    "xterm.js": resolve("@xterm/xterm"),
     "xterm-readline.js": resolve("xterm-readline"),
     "xterm_addon-fit.js": fetch(`${CDN}/@xterm/addon-fit/+esm`).then((b) =>
         b.text(),
@@ -54,9 +54,9 @@ const modules = {
     "xterm_addon-web-links.js": fetch(
         `${CDN}/@xterm/addon-web-links/+esm`,
     ).then((b) => b.text()),
-    "xterm.css": fetch(`${CDN}/xterm@${v("xterm")}/css/xterm.min.css`).then(
+    "xterm.css": fetch(
-        (b) => b.text(),
+        `${CDN}/@xterm/xterm@${v("@xterm/xterm")}/css/xterm.min.css`,
-    ),
+    ).then((b) => b.text()),
 
     // codemirror
     "codemirror.js": reBundle("codemirror"),

core/rollup/build_test_index.cjs

@@ -0,0 +1,73 @@
+const { join } = require("node:path");
+const { lstatSync, readdirSync, writeFileSync } = require("node:fs");
+
+// folders to not consider while crawling
+const EXCLUDE_DIR = new Set(["ws"]);
+
+const TEST_DIR = join(__dirname, "..", "tests");
+
+const TEST_INDEX = join(TEST_DIR, "index.html");
+
+const crawl = (path, tree = {}) => {
+    for (const file of readdirSync(path)) {
+        const current = join(path, file);
+        if (current === TEST_INDEX) continue;
+        if (lstatSync(current).isDirectory()) {
+            if (EXCLUDE_DIR.has(file)) continue;
+            const sub = {};
+            tree[file] = sub;
+            crawl(current, sub);
+            if (!Reflect.ownKeys(sub).length) {
+                delete tree[file];
+            }
+        } else if (file.endsWith(".html")) {
+            const name = file === "index.html" ? "." : file.slice(0, -5);
+            tree[name] = current.replace(TEST_DIR, "");
+        }
+    }
+    return tree;
+};
+
+const createList = (tree) => {
+    const ul = ["<ul>"];
+    for (const [key, value] of Object.entries(tree)) {
+        ul.push("<li>");
+        if (typeof value === "string") {
+            ul.push(`<a href=".${value}">${key}<small>.html</small></a>`);
+        } else {
+            if ("." in value) {
+                ul.push(`<strong><a href=".${value["."]}">${key}</a></strong>`);
+                delete value["."];
+            } else {
+                ul.push(`<strong><span>${key}</span></strong>`);
+            }
+            if (Reflect.ownKeys(value).length) ul.push(createList(value));
+        }
+        ul.push("</li>");
+    }
+    ul.push("</ul>");
+    return ul.join("");
+};
+
+writeFileSync(
+    TEST_INDEX,
+    `<!doctype html>
+<html lang="en">
+    <head>
+        <meta charset="UTF-8">
+        <meta name="viewport" content="width=device-width, initial-scale=1.0">
+        <title>PyScript tests</title>
+        <style>
+            body { font-family: sans-serif; }
+            a {
+                display: block;
+                transition: opacity .3s;
+            }
+            a, span { opacity: .7; }
+            a:hover { opacity: 1; }
+        </style>
+    </head>
+    <body>${createList(crawl(TEST_DIR))}</body>
+</html>
+`,
+);

core/rollup/core.config.js

@@ -40,4 +40,28 @@ export default [
             warn(warning);
         },
     },
+    {
+        input: "./src/storage.js",
+        plugins: plugins.concat(
+            process.env.NO_MIN
+                ? [nodeResolve(), commonjs()]
+                : [nodeResolve(), commonjs(), terser()],
+        ),
+        output: {
+            esModule: true,
+            dir: "./dist",
+            sourcemap: true,
+        },
+    },
+    {
+        input: "./src/service-worker.js",
+        plugins: plugins.concat(
+            process.env.NO_MIN
+                ? [nodeResolve(), commonjs()]
+                : [nodeResolve(), commonjs(), terser()],
+        ),
+        output: {
+            file: "./dist/service-worker.js",
+        },
+    },
 ];

core/rollup/plugins.cjs

@@ -13,7 +13,12 @@ for (const file of readdirSync(join(__dirname, "..", "src", "plugins"))) {
         plugins.push(
             // this comment is needed to avoid bundlers eagerly embedding lazy
             // dependencies, causing all sort of issues once in production
-            `    ${key}: () => import(/* webpackIgnore: true */ ${value}),`,
+            // ⚠️ THIS HAS TO BE LIKE THIS or prettier changes it every single time
+            `    ${key}: () =>
+        import(
+            /* webpackIgnore: true */
+            ${value}
+        ),`,
         );
     }
 }

core/rollup/stdlib.cjs

@@ -0,0 +1,66 @@
+const {
+    readdirSync,
+    readFileSync,
+    statSync,
+    writeFileSync,
+} = require("node:fs");
+
+const { spawnSync } = require("node:child_process");
+
+const { join } = require("node:path");
+
+const dedent = require("codedent");
+
+const crawl = (path, json) => {
+    for (const file of readdirSync(path)) {
+        const full = join(path, file);
+        if (/\.py$/.test(file)) {
+            if (process.env.NO_MIN) json[file] = readFileSync(full).toString();
+            else {
+                try {
+                    const {
+                        output: [error, result],
+                    } = spawnSync("pyminify", [
+                        "--remove-literal-statements",
+                        full,
+                    ]);
+                    if (error) {
+                        console.error(error);
+                        process.exit(1);
+                    }
+                    json[file] = result.toString();
+                } catch (error) {
+                    console.error(error);
+                    console.log(
+                        dedent(`
+                            \x1b[1m⚠️  is your env activated?\x1b[0m
+                            \x1b[2mYou need a Python env to run \x1b[0mpyminify\x1b[2m.\x1b[0m
+                            \x1b[2mTo do so, you can try the following:\x1b[0m
+                            python -m venv env
+                            source env/bin/activate
+                            pip install --upgrade pip
+                            pip install --ignore-requires-python python-minifier
+                            pip install setuptools
+                            \x1b[2mand you can then try \x1b[0mnpm run build\x1b[2m again.\x1b[0m
+                        `),
+                    );
+                    process.exit(1);
+                }
+            }
+        } else if (statSync(full).isDirectory() && !file.endsWith("_"))
+            crawl(full, (json[file] = {}));
+    }
+};
+
+const json = {};
+
+crawl(join(__dirname, "..", "src", "stdlib"), json);
+
+writeFileSync(
+    join(__dirname, "..", "src", "stdlib", "pyscript.js"),
+    `// ⚠️ This file is an artifact: DO NOT MODIFY\nexport default ${JSON.stringify(
+        json,
+        null,
+        "  ",
+    )};\n`,
+);

core/src/3rd-party-licenses/codemirror.license.txt

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (C) 2018-2021 by Marijn Haverbeke <marijnh@gmail.com> and others
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

core/src/3rd-party-licenses/codemirror_commands.license.txt

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (C) 2018-2021 by Marijn Haverbeke <marijn@haverbeke.berlin> and others
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

core/src/3rd-party-licenses/codemirror_lang-python.license.txt

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (C) 2018-2021 by Marijn Haverbeke <marijn@haverbeke.berlin> and others
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

core/src/3rd-party-licenses/codemirror_language.license.txt

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (C) 2018-2021 by Marijn Haverbeke <marijn@haverbeke.berlin> and others
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

core/src/3rd-party-licenses/codemirror_state.license.txt

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (C) 2018-2021 by Marijn Haverbeke <marijn@haverbeke.berlin> and others
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

core/src/3rd-party-licenses/codemirror_view.license.txt

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (C) 2018-2021 by Marijn Haverbeke <marijn@haverbeke.berlin> and others
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

core/src/3rd-party-licenses/toml.license.txt

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2015 Jak Wings
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

core/src/3rd-party-licenses/xterm-readline.license.txt

@@ -0,0 +1,25 @@
+Copyright 2021 Erik Bremen
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

core/src/3rd-party-licenses/xterm.license.txt

@@ -0,0 +1,21 @@
+Copyright (c) 2017-2019, The xterm.js authors (https://github.com/xtermjs/xterm.js)
+Copyright (c) 2014-2016, SourceLair Private Company (https://www.sourcelair.com)
+Copyright (c) 2012-2013, Christopher Jeffrey (https://github.com/chjj/)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

core/src/3rd-party-licenses/xterm_addon-fit.license.txt

@@ -0,0 +1,19 @@
+Copyright (c) 2019, The xterm.js authors (https://github.com/xtermjs/xterm.js)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

core/src/3rd-party-licenses/xterm_addon-web-links.lixense.txt

@@ -0,0 +1,19 @@
+Copyright (c) 2017, The xterm.js authors (https://github.com/xtermjs/xterm.js)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

core/src/3rd-party/README.md

@@ -5,3 +5,7 @@ This folder contains artifacts created via [3rd-party.cjs](../../rollup/3rd-part
 As we would like to offer a way to run PyScript offline, and we already offer a `dist` folder with all the necessary scripts, we have created a foreign dependencies resolver that allow to lazy-load CDN dependencies out of the box.
 
 Please **note** these dependencies are **not interpreters**, because interpreters have their own mechanism, folders structure, WASM files, and whatnot, to work locally, but at least XTerm or the TOML parser, among other lazy dependencies, should be available within the dist folder.
+
+## Licenses
+
+All licenses provided by 3rd-party authors can be found in [3rd-party-licenses](../3rd-party-licenses/) folder.

core/src/3rd-party/xterm.css

@@ -0,0 +1,7 @@
+/**
+ * Minified by jsDelivr using clean-css v5.3.3.
+ * Original file: /npm/@xterm/xterm@5.5.0/css/xterm.css
+ *
+ * Do NOT use SRI with dynamically generated files! More information: https://www.jsdelivr.com/using-sri-with-dynamic-files
+ */
+.xterm{cursor:text;position:relative;user-select:none;-ms-user-select:none;-webkit-user-select:none}.xterm.focus,.xterm:focus{outline:0}.xterm .xterm-helpers{position:absolute;top:0;z-index:5}.xterm .xterm-helper-textarea{padding:0;border:0;margin:0;position:absolute;opacity:0;left:-9999em;top:0;width:0;height:0;z-index:-5;white-space:nowrap;overflow:hidden;resize:none}.xterm .composition-view{background:#000;color:#fff;display:none;position:absolute;white-space:nowrap;z-index:1}.xterm .composition-view.active{display:block}.xterm .xterm-viewport{background-color:#000;overflow-y:scroll;cursor:default;position:absolute;right:0;left:0;top:0;bottom:0}.xterm .xterm-screen{position:relative}.xterm .xterm-screen canvas{position:absolute;left:0;top:0}.xterm .xterm-scroll-area{visibility:hidden}.xterm-char-measure-element{display:inline-block;visibility:hidden;position:absolute;top:0;left:-9999em;line-height:normal}.xterm.enable-mouse-events{cursor:default}.xterm .xterm-cursor-pointer,.xterm.xterm-cursor-pointer{cursor:pointer}.xterm.column-select.focus{cursor:crosshair}.xterm .xterm-accessibility:not(.debug),.xterm .xterm-message{position:absolute;left:0;top:0;bottom:0;right:0;z-index:10;color:transparent;pointer-events:none}.xterm .xterm-accessibility-tree:not(.debug) ::selection{color:transparent}.xterm .xterm-accessibility-tree{user-select:text;white-space:pre}.xterm .live-region{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}.xterm-dim{opacity:1!important}.xterm-underline-1{text-decoration:underline}.xterm-underline-2{text-decoration:double underline}.xterm-underline-3{text-decoration:wavy underline}.xterm-underline-4{text-decoration:dotted underline}.xterm-underline-5{text-decoration:dashed underline}.xterm-overline{text-decoration:overline}.xterm-overline.xterm-underline-1{text-decoration:overline underline}.xterm-overline.xterm-underline-2{text-decoration:overline double underline}.xterm-overline.xterm-underline-3{text-decoration:overline wavy underline}.xterm-overline.xterm-underline-4{text-decoration:overline dotted underline}.xterm-overline.xterm-underline-5{text-decoration:overline dashed underline}.xterm-strikethrough{text-decoration:line-through}.xterm-screen .xterm-decoration-container .xterm-decoration{z-index:6;position:absolute}.xterm-screen .xterm-decoration-container .xterm-decoration.xterm-decoration-top-layer{z-index:7}.xterm-decoration-overview-ruler{z-index:8;position:absolute;top:0;right:0;pointer-events:none}.xterm-decoration-top{z-index:2;position:relative}

core/src/3rd-party/xterm_addon-fit.js

@@ -0,0 +1,7 @@
+/**
+ * Bundled by jsDelivr using Rollup v2.79.2 and Terser v5.39.0.
+ * Original file: /npm/@xterm/addon-fit@0.10.0/lib/addon-fit.js
+ *
+ * Do NOT use SRI with dynamically generated files! More information: https://www.jsdelivr.com/using-sri-with-dynamic-files
+ */
+var e,t,r={exports:{}};self;var s=r.exports=(e=t={},Object.defineProperty(e,"__esModule",{value:!0}),e.FitAddon=void 0,e.FitAddon=class{activate(e){this._terminal=e}dispose(){}fit(){const e=this.proposeDimensions();if(!e||!this._terminal||isNaN(e.cols)||isNaN(e.rows))return;const t=this._terminal._core;this._terminal.rows===e.rows&&this._terminal.cols===e.cols||(t._renderService.clear(),this._terminal.resize(e.cols,e.rows))}proposeDimensions(){if(!this._terminal)return;if(!this._terminal.element||!this._terminal.element.parentElement)return;const e=this._terminal._core,t=e._renderService.dimensions;if(0===t.css.cell.width||0===t.css.cell.height)return;const r=0===this._terminal.options.scrollback?0:e.viewport.scrollBarWidth,s=window.getComputedStyle(this._terminal.element.parentElement),i=parseInt(s.getPropertyValue("height")),o=Math.max(0,parseInt(s.getPropertyValue("width"))),n=window.getComputedStyle(this._terminal.element),l=i-(parseInt(n.getPropertyValue("padding-top"))+parseInt(n.getPropertyValue("padding-bottom"))),a=o-(parseInt(n.getPropertyValue("padding-right"))+parseInt(n.getPropertyValue("padding-left")))-r;return{cols:Math.max(2,Math.floor(a/t.css.cell.width)),rows:Math.max(1,Math.floor(l/t.css.cell.height))}}},t),i=r.exports.FitAddon,o=r.exports.__esModule;export{i as FitAddon,o as __esModule,s as default};

core/src/3rd-party/xterm_addon-web-links.js

@@ -0,0 +1,7 @@
+/**
+ * Bundled by jsDelivr using Rollup v2.79.2 and Terser v5.39.0.
+ * Original file: /npm/@xterm/addon-web-links@0.11.0/lib/addon-web-links.js
+ *
+ * Do NOT use SRI with dynamically generated files! More information: https://www.jsdelivr.com/using-sri-with-dynamic-files
+ */
+var e={exports:{}};self;var t=e.exports=(()=>{var e={6:(e,t)=>{function r(e){try{const t=new URL(e),r=t.password&&t.username?`${t.protocol}//${t.username}:${t.password}@${t.host}`:t.username?`${t.protocol}//${t.username}@${t.host}`:`${t.protocol}//${t.host}`;return e.toLocaleLowerCase().startsWith(r.toLocaleLowerCase())}catch(e){return!1}}Object.defineProperty(t,"__esModule",{value:!0}),t.LinkComputer=t.WebLinkProvider=void 0,t.WebLinkProvider=class{constructor(e,t,r,n={}){this._terminal=e,this._regex=t,this._handler=r,this._options=n}provideLinks(e,t){const r=n.computeLink(e,this._regex,this._terminal,this._handler);t(this._addCallbacks(r))}_addCallbacks(e){return e.map((e=>(e.leave=this._options.leave,e.hover=(t,r)=>{if(this._options.hover){const{range:n}=e;this._options.hover(t,r,n)}},e)))}};class n{static computeLink(e,t,o,s){const i=new RegExp(t.source,(t.flags||"")+"g"),[a,l]=n._getWindowedLineStrings(e-1,o),c=a.join("");let d;const p=[];for(;d=i.exec(c);){const e=d[0];if(!r(e))continue;const[t,i]=n._mapStrIdx(o,l,0,d.index),[a,c]=n._mapStrIdx(o,t,i,e.length);if(-1===t||-1===i||-1===a||-1===c)continue;const h={start:{x:i+1,y:t+1},end:{x:c,y:a+1}};p.push({range:h,text:e,activate:s})}return p}static _getWindowedLineStrings(e,t){let r,n=e,o=e,s=0,i="";const a=[];if(r=t.buffer.active.getLine(e)){const e=r.translateToString(!0);if(r.isWrapped&&" "!==e[0]){for(s=0;(r=t.buffer.active.getLine(--n))&&s<2048&&(i=r.translateToString(!0),s+=i.length,a.push(i),r.isWrapped&&-1===i.indexOf(" ")););a.reverse()}for(a.push(e),s=0;(r=t.buffer.active.getLine(++o))&&r.isWrapped&&s<2048&&(i=r.translateToString(!0),s+=i.length,a.push(i),-1===i.indexOf(" ")););}return[a,n]}static _mapStrIdx(e,t,r,n){const o=e.buffer.active,s=o.getNullCell();let i=r;for(;n;){const e=o.getLine(t);if(!e)return[-1,-1];for(let r=i;r<e.length;++r){e.getCell(r,s);const i=s.getChars();if(s.getWidth()&&(n-=i.length||1,r===e.length-1&&""===i)){const e=o.getLine(t+1);e&&e.isWrapped&&(e.getCell(0,s),2===s.getWidth()&&(n+=1))}if(n<0)return[t,r]}t++,i=0}return[t,i]}}t.LinkComputer=n}},t={};function r(n){var o=t[n];if(void 0!==o)return o.exports;var s=t[n]={exports:{}};return e[n](s,s.exports,r),s.exports}var n={};return(()=>{var e=n;Object.defineProperty(e,"__esModule",{value:!0}),e.WebLinksAddon=void 0;const t=r(6),o=/(https?|HTTPS?):[/]{2}[^\s"'!*(){}|\\\^<>`]*[^\s"':,.!?{}|\\\^~\[\]`()<>]/;function s(e,t){const r=window.open();if(r){try{r.opener=null}catch{}r.location.href=t}else console.warn("Opening link blocked as opener could not be cleared")}e.WebLinksAddon=class{constructor(e=s,t={}){this._handler=e,this._options=t}activate(e){this._terminal=e;const r=this._options,n=r.urlRegex||o;this._linkProvider=this._terminal.registerLinkProvider(new t.WebLinkProvider(this._terminal,n,this._handler,r))}dispose(){this._linkProvider?.dispose()}}})(),n})(),r=e.exports.WebLinksAddon,n=e.exports.__esModule;export{r as WebLinksAddon,n as __esModule,t as default};

core/src/all-done.js

@@ -1,3 +1,4 @@
+import withResolvers from "@webreflection/utils/with-resolvers";
 import TYPES from "./types.js";
 
 const waitForIt = [];
@@ -5,7 +6,7 @@ const waitForIt = [];
 for (const [TYPE] of TYPES) {
     const selectors = [`script[type="${TYPE}"]`, `${TYPE}-script`];
     for (const element of document.querySelectorAll(selectors.join(","))) {
-        const { promise, resolve } = Promise.withResolvers();
+        const { promise, resolve } = withResolvers();
         waitForIt.push(promise);
         element.addEventListener(`${TYPE}:done`, resolve, { once: true });
     }

core/src/config.js

@@ -25,7 +25,7 @@ const badURL = (url, expected = "") => {
  * @param {string?} type the optional type to enforce
  * @returns {{json: boolean, toml: boolean, text: string}}
  */
-const configDetails = async (config, type) => {
+export const configDetails = async (config, type) => {
     let text = config?.trim();
     // we only support an object as root config
     let url = "",
@@ -56,7 +56,7 @@ const syntaxError = (type, url, { message }) => {
 const configs = new Map();
 
 for (const [TYPE] of TYPES) {
-    /** @type {Promise<[...any]>} A Promise wrapping any plugins which should be loaded. */
+    /** @type {() => Promise<[...any]>} A Promise wrapping any plugins which should be loaded. */
     let plugins;
 
     /** @type {any} The PyScript configuration parsed from the JSON or TOML object*. May be any of the return types of JSON.parse() or toml-j0.4's parse() ( {number | string | boolean | null | object | Array} ) */
@@ -135,22 +135,27 @@ for (const [TYPE] of TYPES) {
 
     // parse all plugins and optionally ignore only
     // those flagged as "undesired" via `!` prefix
-    const toBeAwaited = [];
+    plugins = async () => {
-    for (const [key, value] of Object.entries(allPlugins)) {
+        const toBeAwaited = [];
-        if (error) {
+        for (const [key, value] of Object.entries(allPlugins)) {
-            if (key === "error") {
+            if (error) {
-                // show on page the config is broken, meaning that
+                if (key === "error") {
-                // it was not possible to disable error plugin neither
+                    // show on page the config is broken, meaning that
-                // as that part wasn't correctly parsed anyway
+                    // it was not possible to disable error plugin neither
-                value().then(({ notify }) => notify(error.message));
+                    // as that part wasn't correctly parsed anyway
+                    value().then(({ notify }) => notify(error.message));
+                }
+            } else if (!parsed?.plugins?.includes(`!${key}`)) {
+                toBeAwaited.push(value().then(({ default: p }) => p));
+            } else if (key === "error") {
+                toBeAwaited.push(value().then(({ notOnDOM }) => notOnDOM()));
             }
-        } else if (!parsed?.plugins?.includes(`!${key}`)) {
-            toBeAwaited.push(value().then(({ default: p }) => p));
         }
-    }
+        return await Promise.all(toBeAwaited);
+    };
 
-    // assign plugins as Promise.all only if needed
+    if (Number.isSafeInteger(parsed?.experimental_ffi_timeout))
-    plugins = Promise.all(toBeAwaited);
+        globalThis.reflected_ffi_timeout = parsed?.experimental_ffi_timeout;
 
     configs.set(TYPE, { config: parsed, configURL, plugins, error });
 }

core/src/core.css

@@ -0,0 +1,61 @@
+py-script,
+py-config,
+mpy-script,
+mpy-config {
+    display: none;
+}
+
+/* PyEditor */
+.py-editor-box,
+.mpy-editor-box {
+    padding: 0.5rem;
+}
+.py-editor-input,
+.mpy-editor-input {
+    position: relative;
+}
+.py-editor-box::before,
+.mpy-editor-box::before {
+    content: attr(data-env);
+    display: block;
+    font-size: x-small;
+    text-align: end;
+}
+.py-editor-output,
+.mpy-editor-output {
+    white-space: pre;
+}
+.py-editor-run-button,
+.mpy-editor-run-button {
+    position: absolute;
+    display: flex;
+    right: 0.5rem;
+    bottom: 0.5rem;
+    opacity: 0;
+    transition: opacity 0.25s;
+    z-index: 1;
+    padding: 0;
+}
+.py-editor-box:hover .py-editor-run-button,
+.mpy-editor-box:hover .mpy-editor-run-button,
+.py-editor-run-button:focus,
+.py-editor-run-button.running,
+.mpy-editor-run-button:focus,
+.mpy-editor-run-button.running {
+    opacity: 1;
+}
+
+py-terminal span,
+mpy-terminal span {
+    letter-spacing: 0 !important;
+}
+
+dialog.pyscript-fs {
+    border-radius: 8px;
+    border-width: 1px;
+}
+
+dialog.pyscript-fs > div {
+    display: flex;
+    justify-content: space-between;
+}

core/src/core.js

@@ -1,7 +1,8 @@
 /*! (c) PyScript Development Team */
 
+import "./zero-redirect.js";
 import stickyModule from "sticky-module";
-import "@ungap/with-resolvers";
+import withResolvers from "@webreflection/utils/with-resolvers";
 
 import {
     INVALID_CONTENT,
@@ -33,10 +34,19 @@ import {
     createFunction,
     inputFailure,
 } from "./hooks.js";
+import * as fs from "./fs.js";
+
+import codemirror from "./plugins/codemirror.js";
+export { codemirror };
 
 import { stdlib, optional } from "./stdlib.js";
 export { stdlib, optional, inputFailure };
 
+export const donkey = (options) =>
+    import(/* webpackIgnore: true */ "./plugins/donkey.js").then((module) =>
+        module.default(options),
+    );
+
 // generic helper to disambiguate between custom element and script
 const isScript = ({ tagName }) => tagName === "SCRIPT";
 
@@ -159,6 +169,8 @@ for (const [TYPE, interpreter] of TYPES) {
         // enrich the Python env with some JS utility for main
         interpreter.registerJsModule("_pyscript", {
             PyWorker,
+            fs,
+            interpreter,
             js_import: (...urls) => Promise.all(urls.map((url) => import(url))),
             get target() {
                 return isScript(currentElement)
@@ -174,7 +186,7 @@ for (const [TYPE, interpreter] of TYPES) {
         // ensure plugins are bootstrapped already before custom type definition
         // NOTE: we cannot top-level await in here as plugins import other utilities
         //       from core.js itself so that custom definition should not be blocking.
-        plugins.then(() => {
+        plugins().then(() => {
             // possible early errors sent by polyscript
             const errors = new Map();
 
@@ -316,7 +328,7 @@ for (const [TYPE, interpreter] of TYPES) {
                 class extends HTMLElement {
                     constructor() {
                         assign(super(), {
-                            _wrap: Promise.withResolvers(),
+                            _wrap: withResolvers(),
                             srcCode: "",
                             executed: false,
                         });

core/src/fs.js

@@ -0,0 +1,82 @@
+import IDBMap from "@webreflection/idb-map";
+import withResolvers from "@webreflection/utils/with-resolvers";
+import { assign } from "polyscript/exports";
+import { $$ } from "basic-devtools";
+
+const stop = (event) => {
+    event.preventDefault();
+    event.stopImmediatePropagation();
+};
+
+// ⚠️ these two constants MUST be passed as `fs`
+//     within the worker onBeforeRunAsync hook!
+export const NAMESPACE = "@pyscript.fs";
+export const ERROR = "storage permissions not granted";
+
+export const idb = new IDBMap(NAMESPACE);
+
+/**
+ * Ask a user action via dialog and returns the directory handler once granted.
+ * @param {{id?:string, mode?:"read"|"readwrite", hint?:"desktop"|"documents"|"downloads"|"music"|"pictures"|"videos"}} options
+ * @returns {Promise<FileSystemDirectoryHandle>}
+ */
+export const getFileSystemDirectoryHandle = async (options) => {
+    if (!("showDirectoryPicker" in globalThis)) {
+        return Promise.reject(
+            new Error("showDirectoryPicker is not supported"),
+        );
+    }
+
+    const { promise, resolve, reject } = withResolvers();
+
+    const how = { id: "pyscript", mode: "readwrite", ...options };
+    if (options.hint) how.startIn = options.hint;
+
+    const transient = async () => {
+        try {
+            /* eslint-disable */
+            const handler = await showDirectoryPicker(how);
+            /* eslint-enable */
+            if ((await handler.requestPermission(how)) === "granted") {
+                resolve(handler);
+                return true;
+            }
+        } catch ({ message }) {
+            console.warn(message);
+        }
+        return false;
+    };
+
+    // in case the user decided to attach the event itself
+    // as opposite of relying our dialog walkthrough
+    if (navigator.userActivation?.isActive) {
+        if (!(await transient())) reject(new Error(ERROR));
+    } else {
+        const dialog = assign(document.createElement("dialog"), {
+            className: "pyscript-fs",
+            innerHTML: [
+                "<strong>ℹ️ Persistent FileSystem</strong><hr>",
+                "<p><small>PyScript would like to access a local folder.</small></p>",
+                "<div><button title='ok'>✅ Authorize</button>",
+                "<button title='cancel'>❌</button></div>",
+            ].join(""),
+        });
+
+        const [ok, cancel] = $$("button", dialog);
+
+        ok.addEventListener("click", async (event) => {
+            stop(event);
+            if (await transient()) dialog.close();
+        });
+
+        cancel.addEventListener("click", async (event) => {
+            stop(event);
+            reject(new Error(ERROR));
+            dialog.close();
+        });
+
+        document.body.appendChild(dialog).showModal();
+    }
+
+    return promise;
+};

core/src/hooks.js

@@ -88,7 +88,19 @@ export const hooks = {
         /** @type {Set<function>} */
         onBeforeRun: new SetFunction(),
         /** @type {Set<function>} */
-        onBeforeRunAsync: new SetFunction(),
+        onBeforeRunAsync: new SetFunction([
+            ({ interpreter }) => {
+                interpreter.registerJsModule("_pyscript", {
+                    // cannot be imported from fs.js
+                    // because this code is stringified
+                    fs: {
+                        ERROR: "storage permissions not granted",
+                        NAMESPACE: "@pyscript.fs",
+                    },
+                    interpreter,
+                });
+            },
+        ]),
         /** @type {Set<function>} */
         onAfterRun: new SetFunction(),
         /** @type {Set<function>} */

core/src/plugins.js

@@ -0,0 +1,38 @@
+// ⚠️ This file is an artifact: DO NOT MODIFY
+export default {
+    codemirror: () =>
+        import(
+            /* webpackIgnore: true */
+            "./plugins/codemirror.js"
+        ),
+    ["deprecations-manager"]: () =>
+        import(
+            /* webpackIgnore: true */
+            "./plugins/deprecations-manager.js"
+        ),
+    donkey: () =>
+        import(
+            /* webpackIgnore: true */
+            "./plugins/donkey.js"
+        ),
+    error: () =>
+        import(
+            /* webpackIgnore: true */
+            "./plugins/error.js"
+        ),
+    ["py-editor"]: () =>
+        import(
+            /* webpackIgnore: true */
+            "./plugins/py-editor.js"
+        ),
+    ["py-game"]: () =>
+        import(
+            /* webpackIgnore: true */
+            "./plugins/py-game.js"
+        ),
+    ["py-terminal"]: () =>
+        import(
+            /* webpackIgnore: true */
+            "./plugins/py-terminal.js"
+        ),
+};

core/src/plugins/codemirror.js

@@ -0,0 +1,31 @@
+// lazy loaded on-demand codemirror related files
+export default {
+    get core() {
+        return import(/* webpackIgnore: true */ "../3rd-party/codemirror.js");
+    },
+    get state() {
+        return import(
+            /* webpackIgnore: true */ "../3rd-party/codemirror_state.js"
+        );
+    },
+    get python() {
+        return import(
+            /* webpackIgnore: true */ "../3rd-party/codemirror_lang-python.js"
+        );
+    },
+    get language() {
+        return import(
+            /* webpackIgnore: true */ "../3rd-party/codemirror_language.js"
+        );
+    },
+    get view() {
+        return import(
+            /* webpackIgnore: true */ "../3rd-party/codemirror_view.js"
+        );
+    },
+    get commands() {
+        return import(
+            /* webpackIgnore: true */ "../3rd-party/codemirror_commands.js"
+        );
+    },
+};

core/src/plugins/deprecations-manager.js

@@ -1,6 +1,6 @@
 // PyScript Derepcations Plugin
-import { hooks } from "../core.js";
 import { notify } from "./error.js";
+import { hooks } from "../core.js";
 
 // react lazily on PyScript bootstrap
 hooks.main.onReady.add(checkDeprecations);

core/src/plugins/donkey.js

@@ -0,0 +1,121 @@
+import addPromiseListener from "add-promise-listener";
+import { assign, dedent } from "polyscript/exports";
+
+const { stringify } = JSON;
+
+const invoke = (name, args) => `${name}(code, ${args.join(", ")})`;
+
+const donkey = ({
+    type = "py",
+    persistent,
+    terminal,
+    config,
+    serviceWorker,
+}) => {
+    const globals = terminal ? '{"__terminal__":__terminal__}' : "{}";
+    const args = persistent ? ["globals()", "__locals__"] : [globals, "{}"];
+
+    const src = URL.createObjectURL(
+        new Blob([
+            [
+                // this array is to better minify this code once in production
+                "from pyscript import sync, config",
+                '__message__ = lambda e,v: f"\x1b[31m\x1b[1m{e.__name__}\x1b[0m: {v}"',
+                "__locals__ = {}",
+                'if config["type"] == "py":',
+                "	import sys",
+                "	def __error__(_):",
+                "		info = sys.exc_info()",
+                "		return __message__(info[0], info[1])",
+                "else:",
+                "	__error__ = lambda e: __message__(e.__class__, e.value)",
+                "def execute(code):",
+                `	try: return ${invoke("exec", args)};`,
+                "	except Exception as e: print(__error__(e));",
+                "def evaluate(code):",
+                `	try: return ${invoke("eval", args)};`,
+                "	except Exception as e: print(__error__(e));",
+                "sync.execute = execute",
+                "sync.evaluate = evaluate",
+            ].join("\n"),
+        ]),
+    );
+
+    // create the script that exposes the code to execute or evaluate
+    const script = assign(document.createElement("script"), { type, src });
+    script.toggleAttribute("worker", true);
+    script.toggleAttribute("terminal", true);
+    if (terminal) script.setAttribute("target", terminal);
+    if (config) {
+        script.setAttribute(
+            "config",
+            typeof config === "string" ? config : stringify(config),
+        );
+    }
+    if (serviceWorker) script.setAttribute("service-worker", serviceWorker);
+
+    return addPromiseListener(
+        document.body.appendChild(script),
+        `${type}:done`,
+        { stopPropagation: true },
+    ).then(() => {
+        URL.revokeObjectURL(src);
+        return script;
+    });
+};
+
+const utils = async (options) => {
+    const script = await donkey(options);
+    const { xworker, process, terminal } = script;
+    const { execute, evaluate } = xworker.sync;
+    script.remove();
+    return {
+        xworker,
+        process,
+        terminal,
+        execute,
+        evaluate,
+    };
+};
+
+export default async (options = {}) => {
+    let farmer = await utils(options);
+    let working = false;
+    const kill = () => {
+        if (farmer) {
+            farmer.xworker.terminate();
+            farmer.terminal.dispose();
+            farmer = null;
+        }
+        working = false;
+    };
+    const reload = async () => {
+        kill();
+        farmer = await utils(options);
+    };
+    const asyncTask = (method) => async (code) => {
+        // race condition ... a new task has been
+        // assigned while the previous one didn't finish
+        if (working) await reload();
+        working = true;
+        try {
+            return await farmer[method](dedent(code));
+        } catch (e) {
+            console.error(e);
+        } finally {
+            working = false;
+        }
+    };
+    const asyncMethod = (method) => async () => {
+        if (working) await reload();
+        else farmer?.terminal[method]();
+    };
+    return {
+        process: asyncTask("process"),
+        execute: asyncTask("execute"),
+        evaluate: asyncTask("evaluate"),
+        clear: asyncMethod("clear"),
+        reset: asyncMethod("reset"),
+        kill,
+    };
+};

core/src/plugins/error.js

@@ -1,6 +1,12 @@
 // PyScript Error Plugin
+import { buffered } from "polyscript/exports";
 import { hooks } from "../core.js";
 
+let dontBotherDOM = false;
+export function notOnDOM() {
+    dontBotherDOM = true;
+}
+
 hooks.main.onReady.add(function override(pyScript) {
     // be sure this override happens only once
     hooks.main.onReady.delete(override);
@@ -8,13 +14,15 @@ hooks.main.onReady.add(function override(pyScript) {
     // trap generic `stderr` to propagate to it regardless
     const { stderr } = pyScript.io;
 
-    // override it with our own logic
+    const cb = (error, ...rest) => {
-    pyScript.io.stderr = (error, ...rest) => {
         notify(error.message || error);
         // let other plugins or stderr hook, if any, do the rest
         return stderr(error, ...rest);
     };
 
+    // override it with our own logic
+    pyScript.io.stderr = pyScript.type === "py" ? cb : buffered(cb);
+
     // be sure uncaught Python errors are also visible
     addEventListener("error", ({ message }) => {
         if (message.startsWith("Uncaught PythonError")) notify(message);
@@ -30,6 +38,7 @@ hooks.main.onReady.add(function override(pyScript) {
  * @param {string} message
  */
 export function notify(message) {
+    if (dontBotherDOM) return;
     const div = document.createElement("div");
     div.className = "py-error";
     div.textContent = message;

core/src/plugins/py-editor.js

@@ -1,14 +1,19 @@
 // PyScript py-editor plugin
+import withResolvers from "@webreflection/utils/with-resolvers";
 import { Hook, XWorker, dedent, defineProperties } from "polyscript/exports";
 import { TYPES, offline_interpreter, relative_url, stdlib } from "../core.js";
+import { notify } from "./error.js";
+import codemirror from "./codemirror.js";
 
-const RUN_BUTTON = `<svg style="height:20px;width:20px;vertical-align:-.125em;transform-origin:center;overflow:visible;color:green" viewBox="0 0 384 512" aria-hidden="true" role="img" xmlns="http://www.w3.org/2000/svg"><g transform="translate(192 256)" transform-origin="96 0"><g transform="translate(0,0) scale(1,1)"><path d="M361 215C375.3 223.8 384 239.3 384 256C384 272.7 375.3 288.2 361 296.1L73.03 472.1C58.21 482 39.66 482.4 24.52 473.9C9.377 465.4 0 449.4 0 432V80C0 62.64 9.377 46.63 24.52 38.13C39.66 29.64 58.21 29.99 73.03 39.04L361 215z" fill="currentColor" transform="translate(-192 -256)"></path></g></g></svg>`;
+const RUN_BUTTON = `<svg style="height:24px;width:24px" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M19,12a1,1,0,0,1-.55.89l-10,5A1,1,0,0,1,8,18a1,1,0,0,1-.53-.15A1,1,0,0,1,7,17V7a1,1,0,0,1,1.45-.89l10,5A1,1,0,0,1,19,12Z" fill="#464646"/></svg>`;
+const STOP_BUTTON = `<svg style="height:24px;width:24px" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M7 7h10v10H7z" style="fill:#464646;stroke:#464646;stroke-width:1;stroke-linecap:butt;stroke-linejoin:round;stroke-dasharray:none;paint-order:normal"/></svg>`;
 
 let id = 0;
 const getID = (type) => `${type}-editor-${id++}`;
 
 const envs = new Map();
 const configs = new Map();
+const editors = new WeakMap();
 
 const hooks = {
     worker: {
@@ -23,12 +28,23 @@ const hooks = {
     },
 };
 
-async function execute({ currentTarget }) {
+const validate = (config, result) => {
+    if (typeof result === "boolean") throw `Invalid source: ${config}`;
+    return result;
+};
+
+const getRelatedScript = (target, type) => {
+    const editor = target.closest(`.${type}-editor-box`);
+    return editor?.parentNode?.previousElementSibling;
+};
+
+async function execute({ currentTarget, script }) {
     const { env, pySrc, outDiv } = this;
     const hasRunButton = !!currentTarget;
 
     if (hasRunButton) {
-        currentTarget.disabled = true;
+        currentTarget.classList.add("running");
+        currentTarget.innerHTML = STOP_BUTTON;
         outDiv.innerHTML = "";
     }
 
@@ -40,28 +56,50 @@ async function execute({ currentTarget }) {
         };
         const { config } = this;
         if (config) {
-            details.configURL = relative_url(config);
+            // verify that config can be parsed and used
-            if (config.endsWith(".toml")) {
+            try {
-                const [{ parse }, toml] = await Promise.all([
+                details.configURL = relative_url(config);
-                    import(/* webpackIgnore: true */ "../3rd-party/toml.js"),
+                if (config.endsWith(".toml")) {
-                    fetch(config).then((r) => r.text()),
+                    const [{ parse }, toml] = await Promise.all([
-                ]);
+                        import(
-                details.config = parse(toml);
+                            /* webpackIgnore: true */ "../3rd-party/toml.js"
-            } else if (config.endsWith(".json")) {
+                        ),
-                details.config = await fetch(config).then((r) => r.json());
+                        fetch(config).then((r) => r.ok && r.text()),
-            } else {
+                    ]);
-                details.configURL = relative_url("./config.txt");
+                    details.config = parse(validate(config, toml));
-                details.config = JSON.parse(config);
+                } else if (config.endsWith(".json")) {
+                    const json = await fetch(config).then(
+                        (r) => r.ok && r.json(),
+                    );
+                    details.config = validate(config, json);
+                } else {
+                    details.configURL = relative_url("./config.txt");
+                    details.config = JSON.parse(config);
+                }
+                details.version = offline_interpreter(details.config);
+            } catch (error) {
+                notify(error);
+                return;
             }
-            details.version = offline_interpreter(details.config);
         } else {
             details.config = {};
         }
 
         const xworker = XWorker.call(new Hook(null, hooks), srcLink, details);
 
+        // expose xworker like in terminal or other workers to allow
+        // creation and destruction of editors on the fly
+        if (hasRunButton) {
+            for (const type of TYPES.keys()) {
+                script = getRelatedScript(currentTarget, type);
+                if (script) break;
+            }
+        }
+
+        defineProperties(script, { xworker: { value: xworker } });
+
         const { sync } = xworker;
-        const { promise, resolve } = Promise.withResolvers();
+        const { promise, resolve } = withResolvers();
         envs.set(env, promise);
         sync.revoke = () => {
             URL.revokeObjectURL(srcLink);
@@ -74,35 +112,98 @@ async function execute({ currentTarget }) {
     return envs.get(env).then((xworker) => {
         xworker.onerror = ({ error }) => {
             if (hasRunButton) {
-                outDiv.innerHTML += `<span style='color:red'>${
+                outDiv.insertAdjacentHTML(
-                    error.message || error
+                    "beforeend",
-                }</span>\n`;
+                    `<span style='color:red'>${
+                        error.message || error
+                    }</span>\n`,
+                );
             }
             console.error(error);
         };
 
         const enable = () => {
-            if (hasRunButton) currentTarget.disabled = false;
+            if (hasRunButton) {
+                currentTarget.classList.remove("running");
+                currentTarget.innerHTML = RUN_BUTTON;
+                const { previousElementSibling } =
+                    currentTarget.closest("[data-env]").parentElement;
+                previousElementSibling?.dispatchEvent(
+                    new Event("py-editor:done", {
+                        bubbles: true,
+                        cancelable: true,
+                    }),
+                );
+            }
         };
         const { sync } = xworker;
         sync.write = (str) => {
             if (hasRunButton) outDiv.innerText += `${str}\n`;
+            else console.log(str);
         };
         sync.writeErr = (str) => {
             if (hasRunButton) {
-                outDiv.innerHTML += `<span style='color:red'>${str}</span>\n`;
+                outDiv.insertAdjacentHTML(
+                    "beforeend",
+                    `<span style='color:red'>${str}</span>\n`,
+                );
+            } else {
+                notify(str);
+                console.error(str);
             }
         };
         sync.runAsync(pySrc).then(enable, enable);
     });
 }
 
+const replaceScript = (script, type) => {
+    script.xworker?.terminate();
+    const clone = script.cloneNode(true);
+    clone.type = `${type}-editor`;
+    const editor = editors.get(script);
+    if (editor) {
+        const content = editor.state.doc.toString();
+        clone.textContent = content;
+        editors.delete(script);
+        script.nextElementSibling.remove();
+    }
+    script.replaceWith(clone);
+};
+
 const makeRunButton = (handler, type) => {
     const runButton = document.createElement("button");
     runButton.className = `absolute ${type}-editor-run-button`;
     runButton.innerHTML = RUN_BUTTON;
     runButton.setAttribute("aria-label", "Python Script Run Button");
     runButton.addEventListener("click", async (event) => {
+        if (
+            runButton.classList.contains("running") &&
+            confirm("Stop evaluating this code?")
+        ) {
+            const script = getRelatedScript(runButton, type);
+            if (script) {
+                const env = script.getAttribute("env");
+                // remove the bootstrapped env which could be one or shared
+                if (env) {
+                    for (const [key, value] of TYPES) {
+                        if (key === type) {
+                            configs.delete(`${value}-${env}`);
+                            envs.delete(`${value}-${env}`);
+                            break;
+                        }
+                    }
+                }
+                // lonley script without setup node should be replaced
+                if (script.xworker) replaceScript(script, type);
+                // all scripts sharing the same env should be replaced
+                else {
+                    const sel = `script[type^="${type}-editor"][env="${env}"]`;
+                    for (const script of document.querySelectorAll(sel))
+                        replaceScript(script, type);
+                }
+            }
+            return;
+        }
         runButton.blur();
         await handler.handleEvent(event);
     });
@@ -154,14 +255,12 @@ const init = async (script, type, interpreter) => {
         { keymap },
         { defaultKeymap, indentWithTab },
     ] = await Promise.all([
-        import(/* webpackIgnore: true */ "../3rd-party/codemirror.js"),
+        codemirror.core,
-        import(/* webpackIgnore: true */ "../3rd-party/codemirror_state.js"),
+        codemirror.state,
-        import(
+        codemirror.python,
-            /* webpackIgnore: true */ "../3rd-party/codemirror_lang-python.js"
+        codemirror.language,
-        ),
+        codemirror.view,
-        import(/* webpackIgnore: true */ "../3rd-party/codemirror_language.js"),
+        codemirror.commands,
-        import(/* webpackIgnore: true */ "../3rd-party/codemirror_view.js"),
-        import(/* webpackIgnore: true */ "../3rd-party/codemirror_commands.js"),
     ]);
 
     let isSetup = script.hasAttribute("setup");
@@ -187,9 +286,22 @@ const init = async (script, type, interpreter) => {
 
     configs.set(env, hasConfig);
 
-    let source = script.src
+    let source = script.textContent;
-        ? await fetch(script.src).then((b) => b.text())
+
-        : script.textContent;
+    // verify the src points to a valid file that can be parsed
+    const { src } = script;
+    if (src) {
+        try {
+            source = validate(
+                src,
+                await fetch(src).then((b) => b.ok && b.text()),
+            );
+        } catch (error) {
+            notify(error);
+            return;
+        }
+    }
+
     const context = {
         // allow the listener to be overridden at distance
         handleEvent: execute,
@@ -250,9 +362,11 @@ const init = async (script, type, interpreter) => {
             /**
              * Simulate a setup node overriding the source to evaluate.
              * @param {string} code the Python code to evaluate.
+             * @param {boolean} asRunButtonAction invoke the `Run` button handler.
              * @returns {Promise<...>} fulfill once code has been evaluated.
              */
-            value(code) {
+            value(code, asRunButtonAction = false) {
+                if (asRunButtonAction) return listener();
                 const wasSetup = isSetup;
                 const wasSource = source;
                 isSetup = true;
@@ -268,14 +382,14 @@ const init = async (script, type, interpreter) => {
         },
     });
 
-    const notify = () => {
+    const notifyEditor = () => {
         const event = new Event(`${type}-editor`, { bubbles: true });
         script.dispatchEvent(event);
     };
 
     if (isSetup) {
-        await context.handleEvent({ currentTarget: null });
+        await context.handleEvent({ currentTarget: null, script });
-        notify();
+        notifyEditor();
         return;
     }
 
@@ -333,8 +447,9 @@ const init = async (script, type, interpreter) => {
         doc,
     });
 
+    editors.set(script, editor);
     editor.focus();
-    notify();
+    notifyEditor();
 };
 
 // avoid too greedy MutationObserver operations at distance

core/src/plugins/py-game.js

@@ -0,0 +1,112 @@
+import {
+    dedent,
+    define,
+    createProgress,
+    loadProgress,
+} from "polyscript/exports";
+
+import { stdlib } from "../core.js";
+import { configDetails } from "../config.js";
+import { getText } from "../fetch.js";
+
+const progress = createProgress("py-game");
+
+const inputPatch = `
+import builtins
+def input(prompt=""):
+    import js
+    return js.prompt(prompt)
+
+builtins.input = input
+del builtins
+del input
+`;
+
+let toBeWarned = true;
+
+const hooks = {
+    main: {
+        onReady: async (wrap, script) => {
+            if (toBeWarned) {
+                toBeWarned = false;
+                console.warn("⚠️ EXPERIMENTAL `py-game` FEATURE");
+            }
+
+            let config = {};
+            if (script.hasAttribute("config")) {
+                const value = script.getAttribute("config");
+                const { json, toml, text, url } = await configDetails(value);
+                if (json) config = JSON.parse(text);
+                else if (toml) {
+                    const { parse } = await import(
+                        /* webpackIgnore: true */ "../3rd-party/toml.js"
+                    );
+                    config = parse(text);
+                }
+                if (config.packages) {
+                    await wrap.interpreter.loadPackage("micropip");
+                    const micropip = wrap.interpreter.pyimport("micropip");
+                    await micropip.install(config.packages, {
+                        keep_going: true,
+                    });
+                    micropip.destroy();
+                }
+                await loadProgress(
+                    "py-game",
+                    progress,
+                    wrap.interpreter,
+                    config,
+                    url ? new URL(url, location.href).href : location.href,
+                );
+            }
+
+            wrap.interpreter.registerJsModule("_pyscript", {
+                PyWorker() {
+                    throw new Error(
+                        "Unable to use PyWorker in py-game scripts",
+                    );
+                },
+                js_import: (...urls) =>
+                    Promise.all(urls.map((url) => import(url))),
+                get target() {
+                    return script.id;
+                },
+            });
+
+            await wrap.interpreter.runPythonAsync(stdlib);
+            wrap.interpreter.runPython(inputPatch);
+
+            let code = dedent(script.textContent);
+            if (script.src) code = await fetch(script.src).then(getText);
+
+            const target = script.getAttribute("target") || "canvas";
+            const canvas = document.getElementById(target);
+            wrap.interpreter.canvas.setCanvas2D(canvas);
+
+            // allow 3rd party to hook themselves right before
+            // the code gets executed
+            const event = new CustomEvent("py-game", {
+                bubbles: true,
+                cancelable: true,
+                detail: {
+                    canvas,
+                    code,
+                    config,
+                    wrap,
+                },
+            });
+            script.dispatchEvent(event);
+            // run only if the default was not prevented
+            if (!event.defaultPrevented)
+                await wrap.interpreter.runPythonAsync(code);
+        },
+    },
+};
+
+define("py-game", {
+    config: { packages: ["pygame-ce"] },
+    configURL: new URL("./config.txt", location.href).href,
+    interpreter: "pyodide",
+    env: "py-game",
+    hooks,
+});

core/src/plugins/py-terminal/mpy.js

@@ -1,6 +1,7 @@
 // PyScript pyodide terminal plugin
-import { hooks, inputFailure } from "../../core.js";
+import withResolvers from "@webreflection/utils/with-resolvers";
 import { defineProperties } from "polyscript/exports";
+import { hooks, inputFailure } from "../../core.js";
 
 const bootstrapped = new WeakSet();
 
@@ -34,6 +35,8 @@ const workerReady = ({ interpreter, io, run, type }, { sync }) => {
         pyterminal_write(String(error.message || error));
     };
 
+    sync.pyterminal_stream_write = () => {};
+
     // tiny shim of the code module with only interact
     // to bootstrap a REPL like environment
     interpreter.registerJsModule("code", {
@@ -71,6 +74,7 @@ export default async (element) => {
         disableStdin: false,
         cursorBlink: true,
         cursorStyle: "block",
+        lineHeight: 1.2,
     };
 
     let stream;
@@ -143,7 +147,7 @@ export default async (element) => {
             // frees the worker on \r
             sync.pyterminal_read = (buffer) => {
                 terminal.write(buffer);
-                promisedChunks = Promise.withResolvers();
+                promisedChunks = withResolvers();
                 return promisedChunks.promise;
             };
 

core/src/plugins/py-terminal/py.js

@@ -1,6 +1,6 @@
 // PyScript py-terminal plugin
-import { hooks } from "../../core.js";
 import { defineProperties } from "polyscript/exports";
+import { hooks } from "../../core.js";
 
 const bootstrapped = new WeakSet();
 
@@ -126,6 +126,7 @@ export default async (element) => {
                 disableStdin: false,
                 cursorBlink: true,
                 cursorStyle: "block",
+                lineHeight: 1.2,
             });
 
             xworker.sync.is_pyterminal = () => true;
@@ -136,6 +137,18 @@ export default async (element) => {
         // setup remote thread JS/Python code for whenever the
         // worker is ready to become a terminal
         hooks.worker.onReady.add(workerReady);
+
+        // @see https://github.com/pyscript/pyscript/issues/2246
+        const patchInput = [
+            "import builtins as _b",
+            "from pyscript import sync as _s",
+            "_b.input = _s.pyterminal_read",
+            "del _b",
+            "del _s",
+        ].join("\n");
+
+        hooks.worker.codeBeforeRun.add(patchInput);
+        hooks.worker.codeBeforeRunAsync.add(patchInput);
     } else {
         // in the main case, just bootstrap XTerm without
         // allowing any input as that's not possible / awkward

core/src/service-worker.js

@@ -0,0 +1 @@
+import "polyscript/service-worker";

core/src/stdlib/pyscript/__init__.py

@@ -30,8 +30,6 @@
 #     as it works transparently in both the main thread and worker cases.
 
 from polyscript import lazy_py_modules as py_import
-from pyscript.display import HTML, display
-from pyscript.fetch import fetch
 from pyscript.magic_js import (
     RUNNING_IN_WORKER,
     PyWorker,
@@ -43,19 +41,11 @@ from pyscript.magic_js import (
     sync,
     window,
 )
+from pyscript.display import HTML, display
+from pyscript.fetch import fetch
 from pyscript.storage import Storage, storage
 from pyscript.websocket import WebSocket
+from pyscript.events import when, Event
 
 if not RUNNING_IN_WORKER:
     from pyscript.workers import create_named_worker, workers
-
-try:
-    from pyscript.event_handling import when
-except:
-    # TODO: should we remove this? Or at the very least, we should capture
-    # the traceback otherwise it's very hard to debug
-    from pyscript.util import NotSupported
-
-    when = NotSupported(
-        "pyscript.when", "pyscript.when currently not available with this interpreter"
-    )

core/src/stdlib/pyscript/display.py

@@ -4,6 +4,7 @@ import io
 import re
 
 from pyscript.magic_js import current_target, document, window
+from pyscript.ffi import is_none
 
 _MIME_METHODS = {
     "savefig": "image/png",
@@ -73,14 +74,14 @@ def _eval_formatter(obj, print_method):
     """
     if print_method == "__repr__":
         return repr(obj)
-    elif hasattr(obj, print_method):
+    if hasattr(obj, print_method):
         if print_method == "savefig":
             buf = io.BytesIO()
             obj.savefig(buf, format="png")
             buf.seek(0)
             return base64.b64encode(buf.read()).decode("utf-8")
         return getattr(obj, print_method)()
-    elif print_method == "_repr_mimebundle_":
+    if print_method == "_repr_mimebundle_":
         return {}, {}
     return None
 
@@ -105,13 +106,13 @@ def _format_mime(obj):
         else:
             output = _eval_formatter(obj, method)
 
-        if output is None:
+        if is_none(output):
             continue
-        elif mime_type not in _MIME_RENDERERS:
+        if mime_type not in _MIME_RENDERERS:
             not_available.append(mime_type)
             continue
         break
-    if output is None:
+    if is_none(output):
         if not_available:
             window.console.warn(
                 f"Rendered object requested unavailable MIME renderers: {not_available}"
@@ -135,7 +136,7 @@ def _write(element, value, append=False):
         element.append(out_element)
     else:
         out_element = element.lastElementChild
-        if out_element is None:
+        if is_none(out_element):
             out_element = element
 
     if mime_type in ("application/javascript", "text/html"):
@@ -146,12 +147,14 @@ def _write(element, value, append=False):
 
 
 def display(*values, target=None, append=True):
-    if target is None:
+    if is_none(target):
         target = current_target()
     elif not isinstance(target, str):
-        raise TypeError(f"target must be str or None, not {target.__class__.__name__}")
+        msg = f"target must be str or None, not {target.__class__.__name__}"
+        raise TypeError(msg)
     elif target == "":
-        raise ValueError("Cannot have an empty target")
+        msg = "Cannot have an empty target"
+        raise ValueError(msg)
     elif target.startswith("#"):
         # note: here target is str and not None!
         # align with @when behavior
@@ -160,10 +163,9 @@ def display(*values, target=None, append=True):
     element = document.getElementById(target)
 
     # If target cannot be found on the page, a ValueError is raised
-    if element is None:
+    if is_none(element):
-        raise ValueError(
+        msg = f"Invalid selector with id={target}. Cannot be found in the page."
-            f"Invalid selector with id={target}. Cannot be found in the page."
+        raise ValueError(msg)
-        )
 
     # if element is a <script type="py">, it has a 'target' attribute which
     # points to the visual element holding the displayed values. In that case,

core/src/stdlib/pyscript/events.py

@@ -0,0 +1,168 @@
+import asyncio
+import inspect
+import sys
+
+from functools import wraps
+from pyscript.magic_js import document
+from pyscript.ffi import create_proxy
+from pyscript.util import is_awaitable
+from pyscript import config
+
+
+class Event:
+    """
+    Represents something that may happen at some point in the future.
+    """
+
+    def __init__(self):
+        self._listeners = []
+
+    def trigger(self, result):
+        """
+        Trigger the event with a result to pass into the handlers.
+        """
+        for listener in self._listeners:
+            if is_awaitable(listener):
+                # Use create task to avoid making this an async function.
+                asyncio.create_task(listener(result))
+            else:
+                listener(result)
+
+    def add_listener(self, listener):
+        """
+        Add a callable/awaitable to listen to when this event is triggered.
+        """
+        if is_awaitable(listener) or callable(listener):
+            if listener not in self._listeners:
+                self._listeners.append(listener)
+        else:
+            msg = "Listener must be callable or awaitable."
+            raise ValueError(msg)
+
+    def remove_listener(self, *args):
+        """
+        Clear the specified handler functions in *args. If no handlers
+        provided, clear all handlers.
+        """
+        if args:
+            for listener in args:
+                self._listeners.remove(listener)
+        else:
+            self._listeners = []
+
+
+def when(target, *args, **kwargs):
+    """
+    Add an event listener to the target element(s) for the specified event type.
+
+    The target can be a string representing the event type, or an Event object.
+    If the target is an Event object, the event listener will be added to that
+    object. If the target is a string, the event listener will be added to the
+    element(s) that match the (second) selector argument.
+
+    If a (third) handler argument is provided, it will be called when the event
+    is triggered; thus allowing this to be used as both a function and a
+    decorator.
+    """
+    # If "when" is called as a function, try to grab the handler from the
+    # arguments. If there's no handler, this must be a decorator based call.
+    handler = None
+    if args and (callable(args[0]) or is_awaitable(args[0])):
+        handler = args[0]
+    elif callable(kwargs.get("handler")) or is_awaitable(kwargs.get("handler")):
+        handler = kwargs.pop("handler")
+    # If the target is a string, it is the "older" use of `when` where it
+    # represents the name of a DOM event.
+    if isinstance(target, str):
+        # Extract the selector from the arguments or keyword arguments.
+        selector = args[0] if args else kwargs.pop("selector")
+        if not selector:
+            msg = "No selector provided."
+            raise ValueError(msg)
+        # Grab the DOM elements to which the target event will be attached.
+        from pyscript.web import Element, ElementCollection
+
+        if isinstance(selector, str):
+            elements = document.querySelectorAll(selector)
+        elif isinstance(selector, Element):
+            elements = [selector._dom_element]
+        elif isinstance(selector, ElementCollection):
+            elements = [el._dom_element for el in selector]
+        else:
+            elements = selector if isinstance(selector, list) else [selector]
+
+    def decorator(func):
+        if config["type"] == "mpy":  # Is MicroPython?
+            if is_awaitable(func):
+
+                async def wrapper(*args, **kwargs):
+                    """
+                    This is  a very ugly hack to get micropython working because
+                    `inspect.signature` doesn't exist. It may be actually better
+                    to not try any magic for now and raise the error.
+                    """
+                    try:
+                        return await func(*args, **kwargs)
+
+                    except TypeError as e:
+                        if "takes" in str(e) and "positional arguments" in str(e):
+                            return await func()
+                        raise
+
+            else:
+
+                def wrapper(*args, **kwargs):
+                    """
+                    This is  a very ugly hack to get micropython working because
+                    `inspect.signature` doesn't exist. It may be actually better
+                    to not try any magic for now and raise the error.
+                    """
+                    try:
+                        return func(*args, **kwargs)
+
+                    except TypeError as e:
+                        if "takes" in str(e) and "positional arguments" in str(e):
+                            return func()
+                        raise
+
+        else:
+            sig = inspect.signature(func)
+            if sig.parameters:
+                if is_awaitable(func):
+
+                    async def wrapper(event):
+                        return await func(event)
+
+                else:
+                    wrapper = func
+            else:
+                # Function doesn't receive events.
+                if is_awaitable(func):
+
+                    async def wrapper(*args, **kwargs):
+                        return await func()
+
+                else:
+
+                    def wrapper(*args, **kwargs):
+                        return func()
+
+        wrapper = wraps(func)(wrapper)
+        if isinstance(target, Event):
+            # The target is a single Event object.
+            target.add_listener(wrapper)
+        elif isinstance(target, list) and all(isinstance(t, Event) for t in target):
+            # The target is a list of Event objects.
+            for evt in target:
+                evt.add_listener(wrapper)
+        else:
+            # The target is a string representing an event type, and so a
+            # DOM element or collection of elements is found in "elements".
+            for el in elements:
+                el.addEventListener(target, create_proxy(wrapper))
+        return wrapper
+
+    # If "when" was called as a decorator, return the decorator function,
+    # otherwise just call the internal decorator function with the supplied
+    # handler.
+    return decorator(handler) if handler else decorator

core/src/stdlib/pyscript/ffi.py

@@ -0,0 +1,48 @@
+try:
+    import js
+    from pyodide.ffi import create_proxy as _cp
+    from pyodide.ffi import to_js as _py_tjs
+    from pyodide.ffi import jsnull
+
+    from_entries = js.Object.fromEntries
+    is_none = lambda value: value is None or value is jsnull
+
+    def _tjs(value, **kw):
+        if not hasattr(kw, "dict_converter"):
+            kw["dict_converter"] = from_entries
+        return _py_tjs(value, **kw)
+
+except:
+    from jsffi import create_proxy as _cp
+    from jsffi import to_js as _tjs
+    import js
+
+    jsnull = js.Object.getPrototypeOf(js.Object.prototype)
+    is_none = lambda value: value is None or value is jsnull
+
+create_proxy = _cp
+to_js = _tjs
+
+try:
+    from polyscript import ffi as _ffi
+
+    direct = _ffi.direct
+    gather = _ffi.gather
+    query = _ffi.query
+
+    def assign(source, *args):
+        for arg in args:
+            _ffi.assign(source, to_js(arg))
+        return source
+
+except:
+    import js
+
+    _assign = js.Object.assign
+
+    direct = lambda source: source
+
+    def assign(source, *args):
+        for arg in args:
+            _assign(source, to_js(arg))
+        return source

core/src/stdlib/pyscript/flatted.py

@@ -31,7 +31,7 @@ def _object_keys(value):
 
 
 def _is_array(value):
-    return isinstance(value, list) or isinstance(value, tuple)
+    return isinstance(value, (list, tuple))
 
 
 def _is_object(value):
@@ -60,10 +60,10 @@ def _loop(keys, input, known, output):
 
 
 def _ref(key, value, input, known, output):
-    if _is_array(value) and not value in known:
+    if _is_array(value) and value not in known:
         known.append(value)
         value = _loop(_array_keys(value), input, known, value)
-    elif _is_object(value) and not value in known:
+    elif _is_object(value) and value not in known:
         known.append(value)
         value = _loop(_object_keys(value), input, known, value)
 

core/src/stdlib/pyscript/fs.py

@@ -0,0 +1,82 @@
+mounted = {}
+
+
+async def mount(path, mode="readwrite", root="", id="pyscript"):
+    import js
+    from _pyscript import fs, interpreter
+    from pyscript.ffi import to_js
+    from pyscript.magic_js import (
+        RUNNING_IN_WORKER,
+        sync,
+    )
+
+    js.console.warn("experimental pyscript.fs ⚠️")
+
+    handler = None
+
+    uid = f"{path}@{id}"
+
+    options = {"id": id, "mode": mode}
+    if root != "":
+        options["startIn"] = root
+
+    if RUNNING_IN_WORKER:
+        fsh = sync.storeFSHandler(uid, to_js(options))
+
+        # allow both async and/or SharedArrayBuffer use case
+        if isinstance(fsh, bool):
+            success = fsh
+        else:
+            success = await fsh
+
+        if success:
+            from polyscript import IDBMap
+
+            idb = IDBMap.new(fs.NAMESPACE)
+            handler = await idb.get(uid)
+        else:
+            raise RuntimeError(fs.ERROR)
+
+    else:
+        success = await fs.idb.has(uid)
+
+        if success:
+            handler = await fs.idb.get(uid)
+        else:
+            handler = await fs.getFileSystemDirectoryHandle(to_js(options))
+            await fs.idb.set(uid, handler)
+
+    mounted[path] = await interpreter.mountNativeFS(path, handler)
+
+
+async def revoke(path, id="pyscript"):
+    from _pyscript import fs, interpreter
+    from pyscript.magic_js import (
+        RUNNING_IN_WORKER,
+        sync,
+    )
+
+    uid = f"{path}@{id}"
+
+    if RUNNING_IN_WORKER:
+        had = sync.deleteFSHandler(uid)
+    else:
+        had = await fs.idb.has(uid)
+        if had:
+            had = await fs.idb.delete(uid)
+
+    if had:
+        interpreter._module.FS.unmount(path)
+
+    return had
+
+
+async def sync(path):
+    await mounted[path].syncfs()
+
+
+async def unmount(path):
+    from _pyscript import interpreter
+
+    await sync(path)
+    interpreter._module.FS.unmount(path)

core/src/stdlib/pyscript/magic_js.py

@@ -10,6 +10,11 @@ RUNNING_IN_WORKER = not hasattr(globalThis, "document")
 
 config = json.loads(globalThis.JSON.stringify(_config))
 
+if "MicroPython" in sys.version:
+    config["type"] = "mpy"
+else:
+    config["type"] = "py"
+
 
 # allow `from pyscript.js_modules.xxx import yyy`
 class JSModule:
@@ -20,6 +25,7 @@ class JSModule:
         # avoid pyodide looking for non existent fields
         if not field.startswith("_"):
             return getattr(getattr(js_modules, self.name), field)
+        return None
 
 
 # generate N modules in the system that will proxy the real value
@@ -61,7 +67,11 @@ if RUNNING_IN_WORKER:
 
 else:
     import _pyscript
-    from _pyscript import PyWorker, js_import
+    from _pyscript import PyWorker as _PyWorker, js_import
+    from pyscript.ffi import to_js
+
+    def PyWorker(url, **kw):
+        return _PyWorker(url, to_js(kw))
 
     window = globalThis
     document = globalThis.document

core/src/stdlib/pyscript/media.py

@@ -0,0 +1,87 @@
+from pyscript import window
+from pyscript.ffi import to_js
+
+
+class Device:
+    """Device represents a media input or output device, such as a microphone,
+    camera, or headset.
+    """
+
+    def __init__(self, device):
+        self._dom_element = device
+
+    @property
+    def id(self):
+        return self._dom_element.deviceId
+
+    @property
+    def group(self):
+        return self._dom_element.groupId
+
+    @property
+    def kind(self):
+        return self._dom_element.kind
+
+    @property
+    def label(self):
+        return self._dom_element.label
+
+    def __getitem__(self, key):
+        return getattr(self, key)
+
+    @classmethod
+    async def load(cls, audio=False, video=True):
+        """
+        Load the device stream.
+        """
+        options = {}
+        options["audio"] = audio
+        if isinstance(video, bool):
+            options["video"] = video
+        else:
+            options["video"] = {}
+            for k in video:
+                options["video"][k] = video[k]
+        return await window.navigator.mediaDevices.getUserMedia(to_js(options))
+
+    async def get_stream(self):
+        key = self.kind.replace("input", "").replace("output", "")
+        options = {key: {"deviceId": {"exact": self.id}}}
+        return await self.load(**options)
+
+
+async def list_devices() -> list[dict]:
+    """
+    Return the list of the currently available media input and output devices,
+    such as microphones, cameras, headsets, and so forth.
+
+    Output:
+
+        list(dict) - list of dictionaries representing the available media devices.
+            Each dictionary has the following keys:
+            * deviceId: a string that is an identifier for the represented device
+                that is persisted across sessions. It is un-guessable by other
+                applications and unique to the origin of the calling application.
+                It is reset when the user clears cookies (for Private Browsing, a
+                different identifier is used that is not persisted across sessions).
+
+            * groupId: a string that is a group identifier. Two devices have the same
+                group identifier if they belong to the same physical device — for
+                example a monitor with both a built-in camera and a microphone.
+
+            * kind: an enumerated value that is either "videoinput", "audioinput"
+                or "audiooutput".
+
+            * label: a string describing this device (for example "External USB
+                Webcam").
+
+    Note: the returned list will omit any devices that are blocked by the document
+    Permission Policy: microphone, camera, speaker-selection (for output devices),
+    and so on. Access to particular non-default devices is also gated by the
+    Permissions API, and the list will omit devices for which the user has not
+    granted explicit permission.
+    """
+    # https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/enumerateDevices
+    return [
+        Device(obj) for obj in await window.navigator.mediaDevices.enumerateDevices()
+    ]

core/src/stdlib/pyscript/storage.py

@@ -1,19 +1,21 @@
 from polyscript import storage as _storage
 from pyscript.flatted import parse as _parse
 from pyscript.flatted import stringify as _stringify
+from pyscript.ffi import is_none
 
 
 # convert a Python value into an IndexedDB compatible entry
 def _to_idb(value):
-    if value is None:
+    if is_none(value):
         return _stringify(["null", 0])
     if isinstance(value, (bool, float, int, str, list, dict, tuple)):
         return _stringify(["generic", value])
     if isinstance(value, bytearray):
-        return _stringify(["bytearray", [v for v in value]])
+        return _stringify(["bytearray", list(value)])
     if isinstance(value, memoryview):
-        return _stringify(["memoryview", [v for v in value]])
+        return _stringify(["memoryview", list(value)])
-    raise TypeError(f"Unexpected value: {value}")
+    msg = f"Unexpected value: {value}"
+    raise TypeError(msg)
 
 
 # convert an IndexedDB compatible entry into a Python value
@@ -56,5 +58,6 @@ class Storage(dict):
 
 async def storage(name="", storage_class=Storage):
     if not name:
-        raise ValueError("The storage name must be defined")
+        msg = "The storage name must be defined"
+        raise ValueError(msg)
     return storage_class(await _storage(f"@pyscript/{name}"))

core/src/stdlib/pyscript/util.py

@@ -0,0 +1,58 @@
+import js
+import sys
+import inspect
+
+
+def as_bytearray(buffer):
+    """
+    Given a JavaScript ArrayBuffer, convert it to a Python bytearray in a
+    MicroPython friendly manner.
+    """
+    ui8a = js.Uint8Array.new(buffer)
+    size = ui8a.length
+    ba = bytearray(size)
+    for i in range(size):
+        ba[i] = ui8a[i]
+    return ba
+
+
+class NotSupported:
+    """
+    Small helper that raises exceptions if you try to get/set any attribute on
+    it.
+    """
+
+    def __init__(self, name, error):
+        object.__setattr__(self, "name", name)
+        object.__setattr__(self, "error", error)
+
+    def __repr__(self):
+        return f"<NotSupported {self.name} [{self.error}]>"
+
+    def __getattr__(self, attr):
+        raise AttributeError(self.error)
+
+    def __setattr__(self, attr, value):
+        raise AttributeError(self.error)
+
+    def __call__(self, *args):
+        raise TypeError(self.error)
+
+
+def is_awaitable(obj):
+    """
+    Returns a boolean indication if the passed in obj is an awaitable
+    function. (MicroPython treats awaitables as generator functions, and if
+    the object is a closure containing an async function we need to work
+    carefully.)
+    """
+    from pyscript import config
+
+    if config["type"] == "mpy":  # Is MicroPython?
+        # MicroPython doesn't appear to have a way to determine if a closure is
+        # an async function except via the repr. This is a bit hacky.
+        if "<closure <generator>" in repr(obj):
+            return True
+        return inspect.isgeneratorfunction(obj)
+
+    return inspect.iscoroutinefunction(obj)

core/src/stdlib/pyscript/web.py

@@ -2,7 +2,11 @@
 
 # `when` is not used in this module. It is imported here save the user an additional
 # import (i.e. they can get what they need from `pyscript.web`).
-from pyscript import document, when  # NOQA
+
+# from __future__ import annotations  # CAUTION: This is not supported in MicroPython.
+
+from pyscript import document, when, Event  # noqa: F401
+from pyscript.ffi import create_proxy, is_none
 
 
 def wrap_dom_element(dom_element):
@@ -64,10 +68,24 @@ class Element:
         If `dom_element` is None we are being called to *create* a new element.
         Otherwise, we are being called to *wrap* an existing DOM element.
         """
-        self._dom_element = dom_element or document.createElement(
+        self._dom_element = (
-            type(self).get_tag_name()
+            document.createElement(type(self).get_tag_name())
+            if is_none(dom_element)
+            else dom_element
         )
 
+        # HTML on_events attached to the element become pyscript.Event instances.
+        self._on_events = {}
+
+        # Handle kwargs for handling named events with a default handler function.
+        properties = {}
+        for name, handler in kwargs.items():
+            if name.startswith("on_"):
+                ev = self.get_event(name)  # Create the default Event instance.
+                ev.add_listener(handler)
+            else:
+                properties[name] = handler
+
         # A set-like interface to the element's `classList`.
         self._classes = Classes(self)
 
@@ -75,7 +93,7 @@ class Element:
         self._style = Style(self)
 
         # Set any specified classes, styles, and DOM properties.
-        self.update(classes=classes, style=style, **kwargs)
+        self.update(classes=classes, style=style, **properties)
 
     def __eq__(self, obj):
         """Check for equality by comparing the underlying DOM element."""
@@ -87,19 +105,32 @@ class Element:
         If `key` is an integer or a slice we use it to index/slice the element's
         children. Otherwise, we use `key` as a query selector.
         """
-        if isinstance(key, int) or isinstance(key, slice):
+        if isinstance(key, (int, slice)):
             return self.children[key]
 
         return self.find(key)
 
     def __getattr__(self, name):
+        """
+        Get an attribute from the element.
+
+        If the attribute is an event (e.g. "on_click"), we wrap it in an `Event`
+        instance and return that. Otherwise, we return the attribute from the
+        underlying DOM element.
+        """
+        if name.startswith("on_"):
+            return self.get_event(name)
         # This allows us to get attributes on the underlying DOM element that clash
         # with Python keywords or built-ins (e.g. the output element has an
         # attribute `for` which is a Python keyword, so you can access it on the
         # Element instance via `for_`).
         if name.endswith("_"):
-            name = name[:-1]
+            name = name[:-1]  # noqa: FURB188 No str.removesuffix() in MicroPython.
-
+        if name == "for":
+            # The `for` attribute is a special case as it is a keyword in both
+            # Python and JavaScript.
+            # We need to get it from the underlying DOM element as `htmlFor`.
+            name = "htmlFor"
         return getattr(self._dom_element, name)
 
     def __setattr__(self, name, value):
@@ -117,10 +148,42 @@ class Element:
             # attribute `for` which is a Python keyword, so you can access it on the
             # Element instance via `for_`).
             if name.endswith("_"):
-                name = name[:-1]
+                name = name[:-1]  # noqa: FURB188 No str.removesuffix() in MicroPython.
+            if name == "for":
+                # The `for` attribute is a special case as it is a keyword in both
+                # Python and JavaScript.
+                # We need to set it on the underlying DOM element as `htmlFor`.
+                name = "htmlFor"
+
+            if name.startswith("on_"):
+                # Ensure on-events are cached in the _on_events dict if the
+                # user is setting them directly.
+                self._on_events[name] = value
 
             setattr(self._dom_element, name, value)
 
+    def get_event(self, name):
+        """
+        Get an `Event` instance for the specified event name.
+        """
+        if not name.startswith("on_"):
+            msg = "Event names must start with 'on_'."
+            raise ValueError(msg)
+        event_name = name[3:]  # Remove the "on_" prefix.
+        if not hasattr(self._dom_element, event_name):
+            msg = f"Element has no '{event_name}' event."
+            raise ValueError(msg)
+        if name in self._on_events:
+            return self._on_events[name]
+        # Such an on-event exists in the DOM element, but we haven't yet
+        # wrapped it in an Event instance. Let's do that now. When the
+        # underlying DOM element's event is triggered, the Event instance
+        # will be triggered too.
+        ev = Event()
+        self._on_events[name] = ev
+        self._dom_element.addEventListener(event_name, create_proxy(ev.trigger))
+        return ev
+
     @property
     def children(self):
         """Return the element's children as an `ElementCollection`."""
@@ -134,7 +197,7 @@ class Element:
     @property
     def parent(self):
         """Return the element's `parent `Element`."""
-        if self._dom_element.parentElement is None:
+        if is_none(self._dom_element.parentElement):
             return None
 
         return Element.wrap_dom_element(self._dom_element.parentElement)
@@ -157,7 +220,7 @@ class Element:
             # We check for list/tuple here and NOT for any iterable as it will match
             # a JS Nodelist which is handled explicitly below.
             # NodeList.
-            elif isinstance(item, list) or isinstance(item, tuple):
+            elif isinstance(item, (list, tuple)):
                 for child in item:
                     self.append(child)
 
@@ -181,10 +244,11 @@ class Element:
 
                     except AttributeError:
                         # Nope! This is not an element or a NodeList.
-                        raise TypeError(
+                        msg = (
                             f'Element "{item}" is a proxy object, "'
                             f"but not a valid element or a NodeList."
                         )
+                        raise TypeError(msg)
 
     def clone(self, clone_id=None):
         """Make a clone of the element (clones the underlying DOM object too)."""
@@ -355,9 +419,8 @@ class Options:
 
         new_option = option(**kwargs)
 
-        if before:
+        if before and isinstance(before, Element):
-            if isinstance(before, Element):
+            before = before._dom_element
-                before = before._dom_element
 
         self._element._dom_element.add(new_option._dom_element, before)
 
@@ -417,11 +480,11 @@ class ContainerElement(Element):
         )
 
         for child in list(args) + (children or []):
-            if isinstance(child, Element) or isinstance(child, ElementCollection):
+            if isinstance(child, (Element, ElementCollection)):
                 self.append(child)
 
             else:
-                self.innerHTML += child
+                self._dom_element.insertAdjacentHTML("beforeend", child)
 
     def __iter__(self):
         yield from self.children
@@ -447,14 +510,13 @@ class ClassesCollection:
         )
 
     def __iter__(self):
-        for class_name in self._all_class_names():
+        yield from self._all_class_names()
-            yield class_name
 
     def __len__(self):
         return len(self._all_class_names())
 
     def __repr__(self):
-        return f"ClassesCollection({repr(self._collection)})"
+        return f"ClassesCollection({self._collection!r})"
 
     def __str__(self):
         return " ".join(self._all_class_names())
@@ -507,7 +569,7 @@ class StyleCollection:
             element.style[key] = value
 
     def __repr__(self):
-        return f"StyleCollection({repr(self._collection)})"
+        return f"StyleCollection({self._collection!r})"
 
     def remove(self, key):
         """Remove a CSS property from the elements in the collection."""
@@ -542,7 +604,7 @@ class ElementCollection:
         if isinstance(key, int):
             return self._elements[key]
 
-        elif isinstance(key, slice):
+        if isinstance(key, slice):
             return ElementCollection(self._elements[key])
 
         return self.find(key)
@@ -1074,12 +1136,13 @@ class video(ContainerElement):
         width = width if width is not None else self.videoWidth
         height = height if height is not None else self.videoHeight
 
-        if to is None:
+        if is_none(to):
             to = canvas(width=width, height=height)
 
         elif isinstance(to, Element):
             if to.tag != "canvas":
-                raise TypeError("Element to snap to must be a canvas.")
+                msg = "Element to snap to must be a canvas."
+                raise TypeError(msg)
 
         elif getattr(to, "tagName", "") == "CANVAS":
             to = canvas(dom_element=to)
@@ -1088,10 +1151,12 @@ class video(ContainerElement):
         elif isinstance(to, str):
             nodelist = document.querySelectorAll(to)  # NOQA
             if nodelist.length == 0:
-                raise TypeError("No element with selector {to} to snap to.")
+                msg = "No element with selector {to} to snap to."
+                raise TypeError(msg)
 
             if nodelist[0].tagName != "CANVAS":
-                raise TypeError("Element to snap to must be a canvas.")
+                msg = "Element to snap to must be a canvas."
+                raise TypeError(msg)
 
             to = canvas(dom_element=nodelist[0])
 

core/src/stdlib/pyscript/websocket.py

@@ -1,9 +1,28 @@
 import js
-from pyscript.util import as_bytearray
+from pyscript.ffi import create_proxy
+from pyscript.util import as_bytearray, is_awaitable
 
 code = "code"
 protocols = "protocols"
 reason = "reason"
+methods = ["onclose", "onerror", "onmessage", "onopen"]
+
+
+def add_listener(socket, onevent, listener):
+    p = create_proxy(listener)
+
+    if is_awaitable(listener):
+
+        async def wrapper(e):
+            await p(EventMessage(e))
+
+        m = wrapper
+
+    else:
+        m = lambda e: p(EventMessage(e))
+
+    # Pyodide fails at setting socket[onevent] directly
+    setattr(socket, onevent, m)
 
 
 class EventMessage:
@@ -22,7 +41,7 @@ class EventMessage:
         return value
 
 
-class WebSocket(object):
+class WebSocket:
     CONNECTING = 0
     OPEN = 1
     CLOSING = 2
@@ -34,20 +53,22 @@ class WebSocket(object):
             socket = js.WebSocket.new(url, kw[protocols])
         else:
             socket = js.WebSocket.new(url)
+
+        socket.binaryType = "arraybuffer"
         object.__setattr__(self, "_ws", socket)
 
-        for t in ["onclose", "onerror", "onmessage", "onopen"]:
+        for t in methods:
             if t in kw:
-                socket[t] = kw[t]
+                add_listener(socket, t, kw[t])
 
     def __getattr__(self, attr):
         return getattr(self._ws, attr)
 
     def __setattr__(self, attr, value):
-        if attr == "onmessage":
+        if attr in methods:
-            self._ws[attr] = lambda e: value(EventMessage(e))
+            add_listener(self._ws, attr, value)
         else:
-            self._ws[attr] = value
+            setattr(self._ws, attr, value)
 
     def close(self, **kw):
         if code in kw and reason in kw:

core/src/stdlib/pyscript/workers.py

@@ -25,10 +25,12 @@ async def create_named_worker(src="", name="", config=None, type="py"):
     from json import dumps
 
     if not src:
-        raise ValueError("Named workers require src")
+        msg = "Named workers require src"
+        raise ValueError(msg)
 
     if not name:
-        raise ValueError("Named workers require a name")
+        msg = "Named workers require a name"
+        raise ValueError(msg)
 
     s = _js.document.createElement("script")
     s.type = type
@@ -37,7 +39,7 @@ async def create_named_worker(src="", name="", config=None, type="py"):
     _set(s, "name", name)
 
     if config:
-        _set(s, "config", isinstance(config, str) and config or dumps(config))
+        _set(s, "config", (isinstance(config, str) and config) or dumps(config))
 
     _js.document.body.append(s)
     return await workers[name]

core/src/storage.js

@@ -0,0 +1,72 @@
+import IDBMapSync from "@webreflection/idb-map/sync";
+import { parse, stringify } from "flatted";
+
+const { isView } = ArrayBuffer;
+
+const to_idb = (value) => {
+    if (value == null) return stringify(["null", 0]);
+    /* eslint-disable no-fallthrough */
+    switch (typeof value) {
+        case "object": {
+            if (isView(value)) return stringify(["memoryview", [...value]]);
+            if (value instanceof ArrayBuffer)
+                return stringify(["bytearray", [...new Uint8Array(value)]]);
+        }
+        case "string":
+        case "number":
+        case "boolean":
+            return stringify(["generic", value]);
+        default:
+            throw new TypeError(`Unexpected value: ${String(value)}`);
+    }
+};
+
+const from_idb = (value) => {
+    const [kind, result] = parse(value);
+    if (kind === "null") return null;
+    if (kind === "generic") return result;
+    if (kind === "bytearray") return new Uint8Array(value).buffer;
+    if (kind === "memoryview") return new Uint8Array(value);
+    return value;
+};
+
+// this export simulate pyscript.storage exposed in the Python world
+export const storage = async (name) => {
+    if (!name) throw new SyntaxError("The storage name must be defined");
+
+    const store = new IDBMapSync(`@pyscript/${name}`);
+    const map = new Map();
+    await store.sync();
+    for (const [k, v] of store.entries()) map.set(k, from_idb(v));
+
+    const clear = () => {
+        map.clear();
+        store.clear();
+    };
+
+    const sync = async () => {
+        await store.sync();
+    };
+
+    return new Proxy(map, {
+        ownKeys: (map) => [...map.keys()],
+        has: (map, name) => map.has(name),
+        get: (map, name) => {
+            if (name === "clear") return clear;
+            if (name === "sync") return sync;
+            return map.get(name);
+        },
+        set: (map, name, value) => {
+            map.set(name, value);
+            store.set(name, to_idb(value));
+            return true;
+        },
+        deleteProperty: (map, name) => {
+            if (map.has(name)) {
+                map.delete(name);
+                store.delete(name);
+            }
+            return true;
+        },
+    });
+};

core/src/sync.js

@@ -0,0 +1,42 @@
+import { idb, getFileSystemDirectoryHandle } from "./fs.js";
+
+export default {
+    // allow pyterminal checks to bootstrap
+    is_pyterminal: () => false,
+
+    /**
+     * 'Sleep' for the given number of seconds. Used to implement Python's time.sleep in Worker threads.
+     * @param {number} seconds The number of seconds to sleep.
+     */
+    sleep(seconds) {
+        return new Promise(($) => setTimeout($, seconds * 1000));
+    },
+
+    /**
+     * Ask a user action via dialog and returns the directory handler once granted.
+     * @param {string} uid
+     * @param {{id?:string, mode?:"read"|"readwrite", hint?:"desktop"|"documents"|"downloads"|"music"|"pictures"|"videos"}} options
+     * @returns {Promise<boolean>}
+     */
+    async storeFSHandler(uid, options = {}) {
+        if (await idb.has(uid)) return true;
+        return getFileSystemDirectoryHandle(options).then(
+            async (handler) => {
+                await idb.set(uid, handler);
+                return true;
+            },
+            () => false,
+        );
+    },
+
+    /**
+     * Explicitly remove the unique identifier for the FS handler.
+     * @param {string} uid
+     * @returns {Promise<boolean>}
+     */
+    async deleteFSHandler(uid) {
+        const had = await idb.has(uid);
+        if (had) await idb.delete(uid);
+        return had;
+    },
+};