A persistent IndexedDB store for PyScript (#2101)

A persistent IndexedDB store for PyScript

pyscript.core/package-lock.json

@@ -1,17 +1,17 @@
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+    "version": "0.4.47",
     "lockfileVersion": 3,
     "requires": true,
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@@ -29,10 +29,11 @@
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@@ -43,9 +44,9 @@
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@@ -225,9 +226,9 @@
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@@ -235,9 +236,9 @@
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@@ -303,31 +304,6 @@
                 "url": "https://github.com/chalk/ansi-regex?sponsor=1"
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@@ -1167,9 +1149,9 @@
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+            "integrity": "sha512-pt0bNEmneDIvdL1Xsd9oDQ/wrQRkXDT4AUWlNZNPKvW5x/jyO9VFXkJUP07vQ2upmw5PlaITaPKc31jK13V+jg==",
             "dev": true,
             "license": "MIT",
             "dependencies": {
@@ -1723,16 +1705,16 @@
             "license": "MIT"
         },
         "node_modules/electron-to-chromium": {
-            "version": "1.4.783",
+            "version": "1.4.805",
-            "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.4.783.tgz",
+            "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.4.805.tgz",
-            "integrity": "sha512-bT0jEz/Xz1fahQpbZ1D7LgmPYZ3iHVY39NcWWro1+hA2IvjiPeaXtfSqrQ+nXjApMvQRE2ASt1itSLRrebHMRQ==",
+            "integrity": "sha512-8W4UJwX/w9T0QSzINJckTKG6CYpAUTqsaWcWIsdud3I1FYJcMgW9QqT1/4CBff/pP/TihWh13OmiyY8neto6vw==",
             "dev": true,
             "license": "ISC"
         },
         "node_modules/emoji-regex": {
-            "version": "8.0.0",
+            "version": "9.2.2",
-            "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+            "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-9.2.2.tgz",
-            "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+            "integrity": "sha512-L18DaJsXSUk2+42pv8mLs5jJT2hqFkFE4j21wOmgbUqsZ2hL72NsUU785g9RXgo3s0ZNgVl42TiHp3ZtOv/Vyg==",
             "dev": true,
             "license": "MIT"
         },
@@ -1770,17 +1752,17 @@
             }
         },
         "node_modules/eslint": {
-            "version": "9.4.0",
+            "version": "9.5.0",
-            "resolved": "https://registry.npmjs.org/eslint/-/eslint-9.4.0.tgz",
+            "resolved": "https://registry.npmjs.org/eslint/-/eslint-9.5.0.tgz",
-            "integrity": "sha512-sjc7Y8cUD1IlwYcTS9qPSvGjAC8Ne9LctpxKKu3x/1IC9bnOg98Zy6GxEJUfr1NojMgVPlyANXYns8oE2c1TAA==",
+            "integrity": "sha512-+NAOZFrW/jFTS3dASCGBxX1pkFD0/fsO+hfAkJ4TyYKwgsXZbqzrw+seCYFCcPCYXvnD67tAnglU7GQTz6kcVw==",
             "dev": true,
             "license": "MIT",
             "dependencies": {
                 "@eslint-community/eslint-utils": "^4.2.0",
                 "@eslint-community/regexpp": "^4.6.1",
-                "@eslint/config-array": "^0.15.1",
+                "@eslint/config-array": "^0.16.0",
                 "@eslint/eslintrc": "^3.1.0",
-                "@eslint/js": "9.4.0",
+                "@eslint/js": "9.5.0",
                 "@humanwhocodes/module-importer": "^1.0.1",
                 "@humanwhocodes/retry": "^0.3.0",
                 "@nodelib/fs.walk": "^1.2.8",
@@ -1792,7 +1774,7 @@
                 "eslint-scope": "^8.0.1",
                 "eslint-visitor-keys": "^4.0.0",
                 "espree": "^10.0.1",
-                "esquery": "^1.4.2",
+                "esquery": "^1.5.0",
                 "esutils": "^2.0.2",
                 "fast-deep-equal": "^3.1.3",
                 "file-entry-cache": "^8.0.0",
@@ -1818,7 +1800,7 @@
                 "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
             },
             "funding": {
-                "url": "https://opencollective.com/eslint"
+                "url": "https://eslint.org/donate"
             }
         },
         "node_modules/eslint-scope": {
@@ -1865,13 +1847,13 @@
             }
         },
         "node_modules/espree": {
-            "version": "10.0.1",
+            "version": "10.1.0",
-            "resolved": "https://registry.npmjs.org/espree/-/espree-10.0.1.tgz",
+            "resolved": "https://registry.npmjs.org/espree/-/espree-10.1.0.tgz",
-            "integrity": "sha512-MWkrWZbJsL2UwnjxTX3gG8FneachS/Mwg7tdGXce011sJd5b0JG54vat5KHnfSBODZ3Wvzd2WnjxyzsRoVv+ww==",
+            "integrity": "sha512-M1M6CpiE6ffoigIOWYO9UDP8TMUw9kqb21tf+08IgDYjCsOvCuDt4jQcZmoYxx+w7zlKw9/N0KXfto+I8/FrXA==",
             "dev": true,
             "license": "BSD-2-Clause",
             "dependencies": {
-                "acorn": "^8.11.3",
+                "acorn": "^8.12.0",
                 "acorn-jsx": "^5.3.2",
                 "eslint-visitor-keys": "^4.0.0"
             },
@@ -2038,9 +2020,9 @@
             "license": "ISC"
         },
         "node_modules/foreground-child": {
-            "version": "3.1.1",
+            "version": "3.2.1",
-            "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-3.1.1.tgz",
+            "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-3.2.1.tgz",
-            "integrity": "sha512-TMKDUnIte6bfb5nWv7V/caI169OHgvwjb7V4WkeUvbQQdjr5rWKqHFiKWb/fcOwB+CzBT+qbWjvj+DVwRskpIg==",
+            "integrity": "sha512-PXUUyLqrR2XCWICfv6ukppP96sdFwWbNEnfEMt7jNsISjMsvaLNinAHNDYyvkyU+SZG2BTSbT5NjG+vZslfGTA==",
             "dev": true,
             "license": "ISC",
             "dependencies": {
@@ -2499,9 +2481,9 @@
             }
         },
         "node_modules/loader-utils": {
-            "version": "3.2.1",
+            "version": "3.3.1",
-            "resolved": "https://registry.npmjs.org/loader-utils/-/loader-utils-3.2.1.tgz",
+            "resolved": "https://registry.npmjs.org/loader-utils/-/loader-utils-3.3.1.tgz",
-            "integrity": "sha512-ZvFw1KWS3GVyYBYb7qkmRM/WwL2TQQBxgCK62rlvm4WpVQ23Nb4tYjApUlfjrEGvOs7KHEsmyUn75OHZrJMWPw==",
+            "integrity": "sha512-FMJTLMXfCLMLfJxcX9PFqX5qD88Z5MRGaZCVzfuqeZSPsyiBzs+pahDQjbIWz2QIzPZz0NX9Zy4FX3lmK6YHIg==",
             "dev": true,
             "license": "MIT",
             "engines": {
@@ -2936,14 +2918,15 @@
             }
         },
         "node_modules/polyscript": {
-            "version": "0.12.14",
+            "version": "0.13.4",
-            "resolved": "https://registry.npmjs.org/polyscript/-/polyscript-0.12.14.tgz",
+            "resolved": "https://registry.npmjs.org/polyscript/-/polyscript-0.13.4.tgz",
-            "integrity": "sha512-inflltAxoMmZZ1qGYIPPBe8KZFPtcatqUCbJjvTzR/gRHpa6PfcZQi2p4HobqDVZLc3LXdODi/GtRxZuRK8a3w==",
+            "integrity": "sha512-kpr2GDq4FLswasiX9QETez3hXTHglzKyNC7gzmH1+dTHEh/GYsa7rbbv0pLr8JWlTm6Rs13fHB8qnaQ0DweCVg==",
             "license": "APACHE-2.0",
             "dependencies": {
                 "@ungap/structured-clone": "^1.2.0",
                 "@ungap/with-resolvers": "^0.1.0",
                 "@webreflection/fetch": "^0.1.5",
+                "@webreflection/idb-map": "^0.3.1",
                 "basic-devtools": "^0.1.6",
                 "codedent": "^0.1.2",
                 "coincident": "^1.2.3",
@@ -3935,18 +3918,21 @@
             "license": "CC0-1.0"
         },
         "node_modules/string-width": {
-            "version": "4.2.3",
+            "version": "5.1.2",
-            "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+            "resolved": "https://registry.npmjs.org/string-width/-/string-width-5.1.2.tgz",
-            "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+            "integrity": "sha512-HnLOCR3vjcY8beoNLtcjZ5/nxn2afmME6lhrDrebokqMap+XbeW8n9TXpPDOqdGK5qcI3oT0GKTW6wC7EMiVqA==",
             "dev": true,
             "license": "MIT",
             "dependencies": {
-                "emoji-regex": "^8.0.0",
+                "eastasianwidth": "^0.2.0",
-                "is-fullwidth-code-point": "^3.0.0",
+                "emoji-regex": "^9.2.2",
-                "strip-ansi": "^6.0.1"
+                "strip-ansi": "^7.0.1"
             },
             "engines": {
-                "node": ">=8"
+                "node": ">=12"
+            },
+            "funding": {
+                "url": "https://github.com/sponsors/sindresorhus"
             }
         },
         "node_modules/string-width-cjs": {
@@ -3965,6 +3951,42 @@
                 "node": ">=8"
             }
         },
+        "node_modules/string-width-cjs/node_modules/emoji-regex": {
+            "version": "8.0.0",
+            "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+            "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+            "dev": true,
+            "license": "MIT"
+        },
+        "node_modules/string-width/node_modules/ansi-regex": {
+            "version": "6.0.1",
+            "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.0.1.tgz",
+            "integrity": "sha512-n5M855fKb2SsfMIiFFoVrABHJC8QtHwVx+mHWP3QcEqBHYienj5dHSgjbxtC0WEZXYt4wcD6zrQElDPhFuZgfA==",
+            "dev": true,
+            "license": "MIT",
+            "engines": {
+                "node": ">=12"
+            },
+            "funding": {
+                "url": "https://github.com/chalk/ansi-regex?sponsor=1"
+            }
+        },
+        "node_modules/string-width/node_modules/strip-ansi": {
+            "version": "7.1.0",
+            "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-7.1.0.tgz",
+            "integrity": "sha512-iq6eVVI64nQQTRYq2KtEg2d2uU7LElhTJwsH4YzIHZshxlgZms/wIc4VoDQTlG/IvVIrBKG06CrZnp0qv7hkcQ==",
+            "dev": true,
+            "license": "MIT",
+            "dependencies": {
+                "ansi-regex": "^6.0.1"
+            },
+            "engines": {
+                "node": ">=12"
+            },
+            "funding": {
+                "url": "https://github.com/chalk/strip-ansi?sponsor=1"
+            }
+        },
         "node_modules/strip-ansi": {
             "version": "6.0.1",
             "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
@@ -4085,9 +4107,9 @@
             }
         },
         "node_modules/terser": {
-            "version": "5.31.0",
+            "version": "5.31.1",
-            "resolved": "https://registry.npmjs.org/terser/-/terser-5.31.0.tgz",
+            "resolved": "https://registry.npmjs.org/terser/-/terser-5.31.1.tgz",
-            "integrity": "sha512-Q1JFAoUKE5IMfI4Z/lkE/E6+SwgzO+x4tq4v1AyBLRj8VSYvRO6A/rQrPg1yud4g0En9EKI1TvFRF2tQFcoUkg==",
+            "integrity": "sha512-37upzU1+viGvuFtBo9NPufCb9dwM0+l9hMxYyWfBA+fbwrPqNJAhbZ6W47bBFnZHKHTUBnMvi87434qq+qnxOg==",
             "dev": true,
             "license": "BSD-2-Clause",
             "dependencies": {
@@ -4287,6 +4309,28 @@
                 "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
             }
         },
+        "node_modules/wrap-ansi-cjs/node_modules/emoji-regex": {
+            "version": "8.0.0",
+            "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+            "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+            "dev": true,
+            "license": "MIT"
+        },
+        "node_modules/wrap-ansi-cjs/node_modules/string-width": {
+            "version": "4.2.3",
+            "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+            "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+            "dev": true,
+            "license": "MIT",
+            "dependencies": {
+                "emoji-regex": "^8.0.0",
+                "is-fullwidth-code-point": "^3.0.0",
+                "strip-ansi": "^6.0.1"
+            },
+            "engines": {
+                "node": ">=8"
+            }
+        },
         "node_modules/wrap-ansi/node_modules/ansi-regex": {
             "version": "6.0.1",
             "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.0.1.tgz",
@@ -4313,31 +4357,6 @@
                 "url": "https://github.com/chalk/ansi-styles?sponsor=1"
             }
         },
-        "node_modules/wrap-ansi/node_modules/emoji-regex": {
-            "version": "9.2.2",
-            "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-9.2.2.tgz",
-            "integrity": "sha512-L18DaJsXSUk2+42pv8mLs5jJT2hqFkFE4j21wOmgbUqsZ2hL72NsUU785g9RXgo3s0ZNgVl42TiHp3ZtOv/Vyg==",
-            "dev": true,
-            "license": "MIT"
-        },
-        "node_modules/wrap-ansi/node_modules/string-width": {
-            "version": "5.1.2",
-            "resolved": "https://registry.npmjs.org/string-width/-/string-width-5.1.2.tgz",
-            "integrity": "sha512-HnLOCR3vjcY8beoNLtcjZ5/nxn2afmME6lhrDrebokqMap+XbeW8n9TXpPDOqdGK5qcI3oT0GKTW6wC7EMiVqA==",
-            "dev": true,
-            "license": "MIT",
-            "dependencies": {
-                "eastasianwidth": "^0.2.0",
-                "emoji-regex": "^9.2.2",
-                "strip-ansi": "^7.0.1"
-            },
-            "engines": {
-                "node": ">=12"
-            },
-            "funding": {
-                "url": "https://github.com/sponsors/sindresorhus"
-            }
-        },
         "node_modules/wrap-ansi/node_modules/strip-ansi": {
             "version": "7.1.0",
             "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-7.1.0.tgz",
@@ -4355,9 +4374,9 @@
             }
         },
         "node_modules/ws": {
-            "version": "8.17.0",
+            "version": "8.17.1",
-            "resolved": "https://registry.npmjs.org/ws/-/ws-8.17.0.tgz",
+            "resolved": "https://registry.npmjs.org/ws/-/ws-8.17.1.tgz",
-            "integrity": "sha512-uJq6108EgZMAl20KagGkzCKfMEjxmKvZHG7Tlq0Z6nOky7YF7aq4mOx6xK8TJ/i1LeK4Qus7INktacctDgY8Ow==",
+            "integrity": "sha512-6XQFvXTkbfUOZOKKILFG1PDK2NDQs4azKQl26T0YS5CxqWLgXajbPZ+h4gZekJyRqFU8pvnbAbbs/3TgRPy+GQ==",
             "license": "MIT",
             "optional": true,
             "engines": {
@@ -4397,6 +4416,28 @@
                 "xterm": "^5.0.0"
             }
         },
+        "node_modules/xterm-readline/node_modules/emoji-regex": {
+            "version": "8.0.0",
+            "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+            "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+            "dev": true,
+            "license": "MIT"
+        },
+        "node_modules/xterm-readline/node_modules/string-width": {
+            "version": "4.2.3",
+            "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+            "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+            "dev": true,
+            "license": "MIT",
+            "dependencies": {
+                "emoji-regex": "^8.0.0",
+                "is-fullwidth-code-point": "^3.0.0",
+                "strip-ansi": "^6.0.1"
+            },
+            "engines": {
+                "node": ">=8"
+            }
+        },
         "node_modules/yaml": {
             "version": "1.10.2",
             "resolved": "https://registry.npmjs.org/yaml/-/yaml-1.10.2.tgz",

pyscript.core/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@pyscript/core",
-    "version": "0.4.46",
+    "version": "0.4.47",
     "type": "module",
     "description": "PyScript",
     "module": "./index.js",
@@ -22,6 +22,7 @@
         "server": "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: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",
@@ -43,7 +44,7 @@
     "dependencies": {
         "@ungap/with-resolvers": "^0.1.0",
         "basic-devtools": "^0.1.6",
-        "polyscript": "^0.12.14",
+        "polyscript": "^0.13.4",
         "sticky-module": "^0.1.1",
         "to-json-callback": "^0.1.1",
         "type-checked-collections": "^0.1.7"
@@ -61,10 +62,11 @@
         "@webreflection/toml-j0.4": "^1.1.3",
         "@xterm/addon-fit": "^0.10.0",
         "@xterm/addon-web-links": "^0.11.0",
-        "bun": "^1.1.13",
+        "bun": "^1.1.14",
         "chokidar": "^3.6.0",
         "codemirror": "^6.0.1",
-        "eslint": "^9.4.0",
+        "eslint": "^9.5.0",
+        "flatted": "^3.3.1",
         "rollup": "^4.18.0",
         "rollup-plugin-postcss": "^4.0.2",
         "rollup-plugin-string": "^3.0.0",

pyscript.core/rollup/flatted.cjs

@@ -0,0 +1,17 @@
+const { writeFileSync, readFileSync } = require("node:fs");
+const { join } = require("node:path");
+
+const flatted = "# https://www.npmjs.com/package/flatted\n\n";
+const source = join(
+    __dirname,
+    "..",
+    "node_modules",
+    "flatted",
+    "python",
+    "flatted.py",
+);
+const dest = join(__dirname, "..", "src", "stdlib", "pyscript", "flatted.py");
+
+const clear = (str) => String(str).replace(/^#.*/gm, "").trimStart();
+
+writeFileSync(dest, flatted + clear(readFileSync(source)));

pyscript.core/src/stdlib/pyscript/__init__.py

@@ -43,6 +43,7 @@ from pyscript.magic_js import (
     sync,
     window,
 )
+from pyscript.storage import Storage, storage
 from pyscript.websocket import WebSocket
 
 try:

pyscript.core/src/stdlib/pyscript/flatted.py

@@ -0,0 +1,148 @@
+# https://www.npmjs.com/package/flatted
+
+import json as _json
+
+
+class _Known:
+    def __init__(self):
+        self.key = []
+        self.value = []
+
+
+class _String:
+    def __init__(self, value):
+        self.value = value
+
+
+def _array_keys(value):
+    keys = []
+    i = 0
+    for _ in value:
+        keys.append(i)
+        i += 1
+    return keys
+
+
+def _object_keys(value):
+    keys = []
+    for key in value:
+        keys.append(key)
+    return keys
+
+
+def _is_array(value):
+    return isinstance(value, list) or isinstance(value, tuple)
+
+
+def _is_object(value):
+    return isinstance(value, dict)
+
+
+def _is_string(value):
+    return isinstance(value, str)
+
+
+def _index(known, input, value):
+    input.append(value)
+    index = str(len(input) - 1)
+    known.key.append(value)
+    known.value.append(index)
+    return index
+
+
+def _loop(keys, input, known, output):
+    for key in keys:
+        value = output[key]
+        if isinstance(value, _String):
+            _ref(key, input[int(value.value)], input, known, output)
+
+    return output
+
+
+def _ref(key, value, input, known, output):
+    if _is_array(value) and not value in known:
+        known.append(value)
+        value = _loop(_array_keys(value), input, known, value)
+    elif _is_object(value) and not value in known:
+        known.append(value)
+        value = _loop(_object_keys(value), input, known, value)
+
+    output[key] = value
+
+
+def _relate(known, input, value):
+    if _is_string(value) or _is_array(value) or _is_object(value):
+        try:
+            return known.value[known.key.index(value)]
+        except:
+            return _index(known, input, value)
+
+    return value
+
+
+def _transform(known, input, value):
+    if _is_array(value):
+        output = []
+        for val in value:
+            output.append(_relate(known, input, val))
+        return output
+
+    if _is_object(value):
+        obj = {}
+        for key in value:
+            obj[key] = _relate(known, input, value[key])
+        return obj
+
+    return value
+
+
+def _wrap(value):
+    if _is_string(value):
+        return _String(value)
+
+    if _is_array(value):
+        i = 0
+        for val in value:
+            value[i] = _wrap(val)
+            i += 1
+
+    elif _is_object(value):
+        for key in value:
+            value[key] = _wrap(value[key])
+
+    return value
+
+
+def parse(value, *args, **kwargs):
+    json = _json.loads(value, *args, **kwargs)
+    wrapped = []
+    for value in json:
+        wrapped.append(_wrap(value))
+
+    input = []
+    for value in wrapped:
+        if isinstance(value, _String):
+            input.append(value.value)
+        else:
+            input.append(value)
+
+    value = input[0]
+
+    if _is_array(value):
+        return _loop(_array_keys(value), input, [value], value)
+
+    if _is_object(value):
+        return _loop(_object_keys(value), input, [value], value)
+
+    return value
+
+
+def stringify(value, *args, **kwargs):
+    known = _Known()
+    input = []
+    output = []
+    i = int(_index(known, input, value))
+    while i < len(input):
+        output.append(_transform(known, input, input[i]))
+        i += 1
+    return _json.dumps(output, *args, **kwargs)

pyscript.core/src/stdlib/pyscript/storage.py

@@ -0,0 +1,60 @@
+from polyscript import storage as _storage
+from pyscript.flatted import parse as _parse
+from pyscript.flatted import stringify as _stringify
+
+
+# convert a Python value into an IndexedDB compatible entry
+def _to_idb(value):
+    if value is None:
+        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]])
+    if isinstance(value, memoryview):
+        return _stringify(["memoryview", [v for v in value]])
+    raise TypeError(f"Unexpected value: {value}")
+
+
+# convert an IndexedDB compatible entry into a Python value
+def _from_idb(value):
+    (
+        kind,
+        result,
+    ) = _parse(value)
+    if kind == "null":
+        return None
+    if kind == "generic":
+        return result
+    if kind == "bytearray":
+        return bytearray(result)
+    if kind == "memoryview":
+        return memoryview(bytearray(result))
+    return value
+
+
+class Storage(dict):
+    def __init__(self, store):
+        super().__init__({k: _from_idb(v) for k, v in store.entries()})
+        self.__store__ = store
+
+    def __delitem__(self, attr):
+        self.__store__.delete(attr)
+        super().__delitem__(attr)
+
+    def __setitem__(self, attr, value):
+        self.__store__.set(attr, _to_idb(value))
+        super().__setitem__(attr, value)
+
+    def clear(self):
+        self.__store__.clear()
+        super().clear()
+
+    async def sync(self):
+        await self.__store__.sync()
+
+
+async def storage(name="", storage_class=Storage):
+    if not name:
+        raise ValueError("The storage name must be defined")
+    return storage_class(await _storage(f"@pyscript/{name}"))

pyscript.core/test/mpy.spec.js

@@ -88,3 +88,8 @@ test('MicroPython + Pyodide ffi', async ({ page }) => {
   await page.goto('http://localhost:8080/test/ffi.html');
   await page.waitForSelector('html.mpy.py');
 });
+
+test('MicroPython + Storage', async ({ page }) => {
+  await page.goto('http://localhost:8080/test/storage.html');
+  await page.waitForSelector('html.ok');
+});

pyscript.core/test/storage.html

@@ -0,0 +1,46 @@
+<!doctype html>
+<html lang="en">
+    <head>
+        <meta charset="UTF-8" />
+        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+        <title>@pyscript/core storage</title>
+        <link rel="stylesheet" href="../dist/core.css">
+        <script type="module" src="../dist/core.js"></script>
+    </head>
+    <body>
+        <script type="mpy" async>
+            from random import random
+            from pyscript import storage
+
+            store = await storage(name="test")
+
+            print("before", len(store))
+            for k in store:
+                if isinstance(store[k], memoryview):
+                    print(f"    {k}: {store[k].hex()} as hex()")
+                else:
+                    print(f"    {k}: {store[k]}")
+
+            store["ba"] = bytearray([0, 1, 2, 3, 4])
+            store["mv"] = memoryview(bytearray([5, 6, 7, 8, 9]))
+            store["random"] = ("some", random(), True)
+            store["key"] = "value"
+
+            print("now", len(store))
+            for k in store:
+                print(f"    {k}: {store[k]}")
+
+            del store["key"]
+            # store.clear()
+
+            print("after", len(store))
+            for k in store:
+                print(f"    {k}: {store[k]}")
+
+            await store.sync()
+
+            import js
+            js.document.documentElement.classList.add("ok")
+        </script>
+    </body>
+</html>

pyscript.core/types/stdlib/pyscript.d.ts

@@ -5,7 +5,9 @@ declare namespace _default {
         "event_handling.py": string;
         "fetch.py": string;
         "ffi.py": string;
+        "flatted.py": string;
         "magic_js.py": string;
+        "storage.py": string;
         "util.py": string;
         web: {
             "__init__.py": string;