diff --git a/examples/altair.html b/examples/altair.html
index 49e724f8..d2f9324e 100644
--- a/examples/altair.html
+++ b/examples/altair.html
@@ -8,7 +8,15 @@
             href="https://pyscript.net/latest/pyscript.css"
         />
         <link rel="stylesheet" href="./assets/css/examples.css" />
-        <script defer src="https://pyscript.net/latest/pyscript.js"></script>
+        <style>
+            py-script {
+                display: none;
+            }
+        </style>
+        <script
+            type="module"
+            src="https://esm.sh/@pyscript/core@latest/core.js"
+        ></script>
     </head>
     <body>
         <nav class="navbar" style="background-color: #000000">
@@ -33,6 +41,7 @@
                     ]
                 </py-config>
                 <py-script>
+                    from pyscript import display
                     import altair as alt
                     from vega_datasets import data
 
diff --git a/examples/bokeh.html b/examples/bokeh.html
index aa50be8b..26f2dd3b 100644
--- a/examples/bokeh.html
+++ b/examples/bokeh.html
@@ -32,8 +32,16 @@
             href="https://pyscript.net/latest/pyscript.css"
         />
 
-        <script defer src="https://pyscript.net/latest/pyscript.js"></script>
         <link rel="stylesheet" href="./assets/css/examples.css" />
+        <style>
+            py-script {
+                display: none;
+            }
+        </style>
+        <script
+            type="module"
+            src="https://esm.sh/@pyscript/core@latest/core.js"
+        ></script>
     </head>
     <body>
         <nav class="navbar" style="background-color: #000000">
diff --git a/examples/folium.html b/examples/folium.html
index 016cc8e9..01e2663e 100644
--- a/examples/folium.html
+++ b/examples/folium.html
@@ -7,8 +7,16 @@
             rel="stylesheet"
             href="https://pyscript.net/latest/pyscript.css"
         />
-        <script defer src="https://pyscript.net/latest/pyscript.js"></script>
         <link rel="stylesheet" href="./assets/css/examples.css" />
+        <style>
+            py-script {
+                display: none;
+            }
+        </style>
+        <script
+            type="module"
+            src="https://esm.sh/@pyscript/core@latest/core.js"
+        ></script>
     </head>
     <body>
         <nav class="navbar" style="background-color: #000000">
@@ -34,6 +42,7 @@
                 </py-config>
 
                 <py-script>
+                    from pyscript import display
                     import folium
                     import json
                     import pandas as pd
diff --git a/examples/hello_world.html b/examples/hello_world.html
index 8929ef83..139f015d 100644
--- a/examples/hello_world.html
+++ b/examples/hello_world.html
@@ -12,7 +12,15 @@
             href="https://pyscript.net/latest/pyscript.css"
         />
         <link rel="stylesheet" href="./assets/css/examples.css" />
-        <script defer src="https://pyscript.net/latest/pyscript.js"></script>
+        <style>
+            py-script {
+                display: none;
+            }
+        </style>
+        <script
+            type="module"
+            src="https://esm.sh/@pyscript/core@latest/core.js"
+        ></script>
     </head>
 
     <body>
@@ -36,6 +44,7 @@
                 Hello world! <br />
                 This is the current date and time, as computed by Python:
                 <py-script>
+                    from pyscript import display
                     from datetime import datetime
                     now = datetime.now()
                     display(now.strftime("%m/%d/%Y, %H:%M:%S"))
diff --git a/examples/matplotlib.html b/examples/matplotlib.html
index a0b93f02..17e133dd 100644
--- a/examples/matplotlib.html
+++ b/examples/matplotlib.html
@@ -7,7 +7,10 @@
             rel="stylesheet"
             href="https://pyscript.net/latest/pyscript.css"
         />
-        <script defer src="https://pyscript.net/latest/pyscript.js"></script>
+        <script
+            type="module"
+            src="https://esm.sh/@pyscript/core@latest/core.js"
+        ></script>
         <link rel="stylesheet" href="./assets/css/examples.css" />
     </head>
     <body>
diff --git a/examples/panel.html b/examples/panel.html
index 9d01cc65..de134167 100644
--- a/examples/panel.html
+++ b/examples/panel.html
@@ -28,7 +28,8 @@
                 <script defer src="https://cdn.bokeh.org/bokeh/release/bokeh-widgets-2.4.3.min.js"></script>
                 <script defer src="https://cdn.bokeh.org/bokeh/release/bokeh-tables-2.4.3.min.js"></script>
                 <script defer src="https://cdn.jsdelivr.net/npm/@holoviz/panel@0.14.1/dist/panel.min.js"></script>
-                <script defer src="https://pyscript.net/latest/pyscript.js"></script>
+                <style>py-script{display:none}</style>
+                <script type="module" src="https://esm.sh/@pyscript/core@latest/core.js"></script>
                 <py-config>
                     packages = [
                       "https://cdn.holoviz.org/panel/0.14.3/dist/wheels/bokeh-2.4.3-py3-none-any.whl",
diff --git a/examples/simple_clock.html b/examples/simple_clock.html
index d5eb608a..06b8d421 100644
--- a/examples/simple_clock.html
+++ b/examples/simple_clock.html
@@ -12,8 +12,16 @@
             href="https://pyscript.net/latest/pyscript.css"
         />
 
-        <script defer src="https://pyscript.net/latest/pyscript.js"></script>
         <link rel="stylesheet" href="./assets/css/examples.css" />
+        <style>
+            py-script {
+                display: none;
+            }
+        </style>
+        <script
+            type="module"
+            src="https://esm.sh/@pyscript/core@latest/core.js"
+        ></script>
     </head>
 
     <body>
@@ -27,10 +35,10 @@
         </nav>
         <section class="pyscript">
             <div class="font-mono">
-                start time: <label id="outputDiv"></label>
+                start time: <label id="output1"></label>
             </div>
-            <div id="outputDiv2" class="font-mono"></div>
-            <div id="outputDiv3" class="font-mono"></div>
+            <div id="output2" class="font-mono"></div>
+            <div id="output3" class="font-mono"></div>
 
             <py-tutor modules="utils.py">
                 <py-config>
@@ -40,12 +48,14 @@
                     [[fetch]]
                     files = ["./utils.py"]
                 </py-config>
-                <py-script>
+                <script type="py">
                     import utils
-                    display(utils.now())
-                </py-script>
+                    from pyscript import display
+                    display(utils.now(), target="output1")
+                </script>
 
                 <py-script>
+                    from pyscript import display
                     from utils import now
                     import asyncio
 
@@ -53,15 +63,14 @@
                       while True:
                         await asyncio.sleep(1)
                         output = now()
-                        Element("outputDiv2").write(output)
+                        display(output, target="output2")
 
-                        out3 = Element("outputDiv3")
                         if output[-1] in ["0", "4", "8"]:
-                          out3.write("It's espresso time!")
+                          display("It's espresso time!", target="output3")
                         else:
-                          out3.clear()
+                          display("", target="output3")
 
-                    pyscript.run_until_complete(foo())
+                    foo()
                 </py-script>
             </py-tutor>
         </section>
diff --git a/examples/todo.html b/examples/todo.html
index 7f909225..28cb8486 100644
--- a/examples/todo.html
+++ b/examples/todo.html
@@ -12,8 +12,11 @@
             href="https://pyscript.net/latest/pyscript.css"
         />
 
-        <script defer src="https://pyscript.net/latest/pyscript.js"></script>
         <link rel="stylesheet" href="./assets/css/examples.css" />
+        <script
+            type="module"
+            src="https://esm.sh/@pyscript/core@latest/core.js"
+        ></script>
     </head>
 
     <body>
@@ -26,14 +29,14 @@
             </div>
         </nav>
         <section class="pyscript">
-            <py-tutor modules="./utils.py;./todo.py">
+            <py-tutor modules="./todo.py">
                 <py-config>
                     plugins = [
                       "https://pyscript.net/latest/plugins/python/py_tutor.py",
                       "./py_list.py"
                     ]
                     [[fetch]]
-                    files = ["./utils.py", "./todo.py"]
+                    files = ["./todo.py"]
                 </py-config>
 
                 <py-script src="./todo.py"></py-script>
@@ -57,7 +60,7 @@
                             id="new-task-btn"
                             class="py-button"
                             type="submit"
-                            py-click="add_task()"
+                            py-click="add_task"
                         >
                             Add task
                         </button>
diff --git a/examples/todo.py b/examples/todo.py
index bf77bb63..deb1f839 100644
--- a/examples/todo.py
+++ b/examples/todo.py
@@ -1,25 +1,30 @@
 from datetime import datetime as dt
 
-from utils import add_class, remove_class
+from pyscript import document
 
 tasks = []
 
+
+def q(selector, root=document):
+    return root.querySelector(selector)
+
+
 # define the task template that will be use to render new templates to the page
-task_template = Element("task-template").select(".task", from_content=True)
-task_list = Element("list-tasks-container")
-new_task_content = Element("new-task-content")
+task_template = q("#task-template").content.querySelector(".task")
+task_list = q("#list-tasks-container")
+new_task_content = q("#new-task-content")
 
 
-def add_task(*args, **kws):
+def add_task(e):
     # ignore empty task
-    if not new_task_content.element.value:
+    if not new_task_content.value:
         return None
 
     # create task
     task_id = f"task-{len(tasks)}"
     task = {
         "id": task_id,
-        "content": new_task_content.element.value,
+        "content": new_task_content.value,
         "done": False,
         "created_at": dt.now(),
     }
@@ -28,26 +33,24 @@ def add_task(*args, **kws):
 
     # add the task element to the page as new node in the list by cloning from a
     # template
-    task_html = task_template.clone(task_id)
-    task_html_content = task_html.select("p")
-    task_html_content.element.innerText = task["content"]
-    task_html_check = task_html.select("input")
-    task_list.element.appendChild(task_html.element)
+    task_html = task_template.cloneNode(True)
+    task_html.id = task_id
+    task_html_check = q("input", root=task_html)
+    task_html_content = q("p", root=task_html)
+    task_html_content.textContent = task["content"]
+    task_list.append(task_html)
 
     def check_task(evt=None):
         task["done"] = not task["done"]
-        if task["done"]:
-            add_class(task_html_content, "line-through")
-        else:
-            remove_class(task_html_content, "line-through")
+        task_html_content.classList.toggle("line-through", task["done"])
 
-    new_task_content.clear()
-    task_html_check.element.onclick = check_task
+    new_task_content.value = ""
+    task_html_check.onclick = check_task
 
 
 def add_task_event(e):
     if e.key == "Enter":
-        add_task()
+        add_task(e)
 
 
-new_task_content.element.onkeypress = add_task_event
+new_task_content.onkeypress = add_task_event
diff --git a/examples/utils.py b/examples/utils.py
index 8abc63e9..7a9de76c 100644
--- a/examples/utils.py
+++ b/examples/utils.py
@@ -10,8 +10,8 @@ def now(fmt="%m/%d/%Y, %H:%M:%S"):
 
 
 def remove_class(element, class_name):
-    element.element.classList.remove(class_name)
+    element.classList.remove(class_name)
 
 
 def add_class(element, class_name):
-    element.element.classList.add(class_name)
+    element.classList.add(class_name)
diff --git a/examples/webgl/raycaster/index.html b/examples/webgl/raycaster/index.html
index a98f8a3f..a0feb0cb 100644
--- a/examples/webgl/raycaster/index.html
+++ b/examples/webgl/raycaster/index.html
@@ -21,19 +21,26 @@
         </div>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/0.147.0/three.min.js"></script>
 
-        <script defer src="https://pyscript.net/latest/pyscript.js"></script>
         <link
             rel="stylesheet"
             href="https://pyscript.net/latest/pyscript.css"
         />
+        <style>
+            py-script {
+                display: none;
+            }
+        </style>
+        <script
+            type="module"
+            src="https://esm.sh/@pyscript/core@latest/core.js"
+        ></script>
         <py-script>
             from pyodide.ffi import create_proxy, to_js
-            from js import window
+            from pyscript import window, document
             from js import Math
             from js import THREE
             from js import performance
             from js import Object
-            from js import document
             import asyncio
 
             mouse = THREE.Vector2.new();
diff --git a/pyscript.core/core.js b/pyscript.core/core.js
index 8a9a4629..e56ffa52 100644
--- a/pyscript.core/core.js
+++ b/pyscript.core/core.js
@@ -1,2 +1,2 @@
 Promise.withResolvers||(Promise.withResolvers=function(){var e,t,r=new this((function(r,n){e=r,t=n}));return{resolve:e,reject:t,promise:r}});const e=(e,t=document)=>t.querySelector(e),t=(e,t=document)=>[...t.querySelectorAll(e)],r=(e,t=document)=>{const r=(new XPathEvaluator).createExpression(e).evaluate(t,XPathResult.ORDERED_NODE_SNAPSHOT_TYPE),n=[];for(let e=0,{snapshotLength:t}=r;e<t;e++)n.push(r.snapshotItem(e));return n},n="object"==typeof self?self:globalThis,s=e=>((e,t)=>{const r=(t,r)=>(e.set(r,t),t),s=o=>{if(e.has(o))return e.get(o);const[a,i]=t[o];switch(a){case 0:case-1:return r(i,o);case 1:{const e=r([],o);for(const t of i)e.push(s(t));return e}case 2:{const e=r({},o);for(const[t,r]of i)e[s(t)]=s(r);return e}case 3:return r(new Date(i),o);case 4:{const{source:e,flags:t}=i;return r(new RegExp(e,t),o)}case 5:{const e=r(new Map,o);for(const[t,r]of i)e.set(s(t),s(r));return e}case 6:{const e=r(new Set,o);for(const t of i)e.add(s(t));return e}case 7:{const{name:e,message:t}=i;return r(new n[e](t),o)}case 8:return r(BigInt(i),o);case"BigInt":return r(Object(BigInt(i)),o)}return r(new n[a](i),o)};return s})(new Map,e)(0),o="",{toString:a}={},{keys:i}=Object,c=e=>{const t=typeof e;if("object"!==t||!e)return[0,t];const r=a.call(e).slice(8,-1);switch(r){case"Array":return[1,o];case"Object":return[2,o];case"Date":return[3,o];case"RegExp":return[4,o];case"Map":return[5,o];case"Set":return[6,o]}return r.includes("Array")?[1,r]:r.includes("Error")?[7,r]:[2,r]},l=([e,t])=>0===e&&("function"===t||"symbol"===t),u=(e,{json:t,lossy:r}={})=>{const n=[];return((e,t,r,n)=>{const s=(e,t)=>{const s=n.push(e)-1;return r.set(t,s),s},o=n=>{if(r.has(n))return r.get(n);let[a,u]=c(n);switch(a){case 0:{let t=n;switch(u){case"bigint":a=8,t=n.toString();break;case"function":case"symbol":if(e)throw new TypeError("unable to serialize "+u);t=null;break;case"undefined":return s([-1],n)}return s([a,t],n)}case 1:{if(u)return s([u,[...n]],n);const e=[],t=s([a,e],n);for(const t of n)e.push(o(t));return t}case 2:{if(u)switch(u){case"BigInt":return s([u,n.toString()],n);case"Boolean":case"Number":case"String":return s([u,n.valueOf()],n)}if(t&&"toJSON"in n)return o(n.toJSON());const r=[],p=s([a,r],n);for(const t of i(n))!e&&l(c(n[t]))||r.push([o(t),o(n[t])]);return p}case 3:return s([a,n.toISOString()],n);case 4:{const{source:e,flags:t}=n;return s([a,{source:e,flags:t}],n)}case 5:{const t=[],r=s([a,t],n);for(const[r,s]of n)(e||!l(c(r))&&!l(c(s)))&&t.push([o(r),o(s)]);return r}case 6:{const t=[],r=s([a,t],n);for(const r of n)!e&&l(c(r))||t.push(o(r));return r}}const{message:p}=n;return s([a,{name:u,message:p}],n)};return o})(!(t||r),!!t,new Map,n)(e),n},{parse:p,stringify:f}=JSON,d={json:!0,lossy:!0};var h=Object.freeze({__proto__:null,parse:e=>s(p(e)),stringify:e=>f(u(e,d))});const y="0811fd41-1b6b-49f1-8344-96210ac283f1",m="M"+y,g="T"+y;var w=e=>({value:new Promise((t=>{let r=new Worker("data:application/javascript,onmessage%3D(%7Bdata%3Ab%7D)%3D%3E(Atomics.wait(b%2C0)%2CpostMessage(0))");r.onmessage=t,r.postMessage(e)}))})
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"application/json",\n    "_repr_javascript_": "application/javascript",\n    "savefig": "image/png",\n}\n\n\ndef _render_image(mime, value, meta):\n    # If the image value is using bytes we should convert it to base64\n    # otherwise it will return raw bytes and the browser will not be able to\n    # render it.\n    if isinstance(value, bytes):\n        value = base64.b64encode(value).decode("utf-8")\n\n    # This is the pattern of base64 strings\n    base64_pattern = re.compile(\n        r"^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)?$"\n    )\n    # If value doesn\'t match the base64 pattern we should encode it to base64\n    if len(value) > 0 and not base64_pattern.match(value):\n        value = base64.b64encode(value.encode("utf-8")).decode("utf-8")\n\n    data = f"data:{mime};charset=utf-8;base64,{value}"\n    attrs = " ".join([\'{k}="{v}"\' for k, v in meta.items()])\n    return f\'<img src="{data}" {attrs}></img>\'\n\n\ndef _identity(value, meta):\n    return value\n\n\n_MIME_RENDERERS = {\n    "text/plain": html.escape,\n    "text/html": _identity,\n    "image/png": lambda value, meta: _render_image("image/png", value, meta),\n    "image/jpeg": lambda value, meta: _render_image("image/jpeg", value, meta),\n    "image/svg+xml": _identity,\n    "application/json": _identity,\n    "application/javascript": lambda value, meta: f"<script>{value}<\\\\/script>",\n}\n\n\ndef _eval_formatter(obj, print_method):\n    """\n    Evaluates a formatter method.\n    """\n    if print_method == "__repr__":\n        return repr(obj)\n    elif hasattr(obj, print_method):\n        if print_method == "savefig":\n            buf = io.BytesIO()\n            obj.savefig(buf, format="png")\n            buf.seek(0)\n            return base64.b64encode(buf.read()).decode("utf-8")\n        return getattr(obj, print_method)()\n    elif print_method == "_repr_mimebundle_":\n        return {}, {}\n    return None\n\n\ndef _format_mime(obj):\n    """\n    Formats object using _repr_x_ methods.\n    """\n    if isinstance(obj, str):\n        return html.escape(obj), "text/plain"\n\n    mimebundle = _eval_formatter(obj, "_repr_mimebundle_")\n    if isinstance(mimebundle, tuple):\n        format_dict, _ = mimebundle\n    else:\n        format_dict = mimebundle\n\n    output, not_available = None, []\n    for method, mime_type in reversed(_MIME_METHODS.items()):\n        if mime_type in format_dict:\n            output = format_dict[mime_type]\n        else:\n            output = _eval_formatter(obj, method)\n\n        if output is None:\n            continue\n        elif mime_type not in _MIME_RENDERERS:\n            not_available.append(mime_type)\n            continue\n        break\n    if output is None:\n        if not_available:\n            window.console.warn(\n                f"Rendered object requested unavailable MIME renderers: {not_available}"\n            )\n        output = repr(output)\n        mime_type = "text/plain"\n    elif isinstance(output, tuple):\n        output, meta = output\n    else:\n        meta = {}\n    return _MIME_RENDERERS[mime_type](output, meta), mime_type\n\n\ndef _write(element, value, append=False):\n    html, mime_type = _format_mime(value)\n    if html == "\\\\n":\n        return\n\n    if append:\n        out_element = document.createElement("div")\n        element.append(out_element)\n    else:\n        out_element = element.lastElementChild\n        if out_element is None:\n            out_element = element\n\n    if mime_type in ("application/javascript", "text/html"):\n        script_element = document.createRange().createContextualFragment(html)\n        out_element.append(script_element)\n    else:\n        out_element.innerHTML = html\n\n\ndef display(*values, target=None, append=True):\n    element = document.getElementById(target)\n    for v in values:\n        _write(element, v, append=append)\n';const It="PY0001",Lt="PY0401",Nt="PY0403",Ct="PY0404",Jt="PY0500",Ht="PY0503";class Dt extends Error{constructor(e,t="",r="text"){super(`(${e}): ${t}`),this.errorCode=e,this.messageType=r,this.name="UserError"}}class Ut extends Dt{constructor(e,t){super(e,t),this.name="FetchError"}}async function zt(e,t){let r;try{r=await fetch(e,t)}catch(t){const r=t;let n;throw n=e.startsWith("http")?`Fetching from URL ${e} failed with error '${r.message}'. Are your filename and path correct?`:'Polyscript: Access to local files\n        (using [[fetch]] configurations in &lt;py-config&gt;)\n        is not available when directly opening a HTML file;\n        you must use a webserver to serve the additional files.\n        See <a style="text-decoration: underline;" href="https://github.com/pyscript/pyscript/issues/257#issuecomment-1119595062">this reference</a>\n        on starting a simple webserver with Python.\n            ',new Ut(It,n)}if(!r.ok){const t=`Fetching from URL ${e} failed with error ${r.status} (${r.statusText}). Are your filename and path correct?`;switch(r.status){case 404:throw new Ut(Ct,t);case 401:throw new Ut(Lt,t);case 403:throw new Ut(Nt,t);case 500:throw new Ut(Jt,t);case 503:throw new Ut(Ht,t);default:throw new Ut(It,t)}}return r}const{defineProperty:qt}=Object,Yt=e=>e.text();let Qt,Xt=0;const Gt=(e="py")=>`${e}-${Xt++}`;let Zt,Kt=e("py-config");Kt?Zt=Kt.getAttribute("src")||Kt.textContent:(Kt=e('script[type="py"]'),Zt=Kt?.getAttribute("config")),/^https?:\/\//.test(Zt)&&(Zt=await zt(Zt).then(Yt));const Vt=e=>"SCRIPT"===e.tagName,er=e=>{qt(document,"currentScript",{configurable:!0,get:()=>e})},tr=()=>{delete document.currentScript},rr=async(e,t)=>{if(e.hasAttribute("src"))try{return await zt(e.getAttribute("src")).then(Yt)}catch(e){t.stderr(e)}return e.textContent},nr=(e,t,r,n)=>{Vt(t)&&r(t);for(const r of sr[n])r(e,t)},sr={onBeforeRun:new Set,onBeforeRunAync:new Set,onAfterRun:new Set,onAfterRunAsync:new Set,onInterpreterReady:new Set,codeBeforeRunWorker:new Set,codeBeforeRunWorkerAsync:new Set,codeAfterRunWorker:new Set,codeAfterRunWorkerAsync:new Set},or=["from pyodide_js import FS",`FS.writeFile('./pyscript.py', ${JSON.stringify(["import polyscript","document=polyscript.xworker.window.document","window=polyscript.xworker.window","sync=polyscript.xworker.sync",Bt].join("\n"))})`].join("\n"),ar={codeBeforeRunWorker:()=>[or,...sr.codeBeforeRunWorker].join("\n"),codeBeforeRunWorkerAsync:()=>[or,...sr.codeBeforeRunWorkerAsync].join("\n"),codeAfterRunWorker:()=>[...sr.codeAfterRunWorker].join("\n"),codeAfterRunWorkerAsync:()=>[...sr.codeAfterRunWorkerAsync].join("\n")};((e,r)=>{if(ot.has(e)||Mt.has(e))throw new Error(`<script type="${e}"> already registered`);if(!ot.has(r?.interpreter))throw new Error("Unspecified interpreter");ot.set(e,ot.get(r?.interpreter)),Rt(e);const n=[`script[type="${e}"]`,`${e}-script`];for(const t of n)kt.set(t,e);jt.push(...n),ct.push(`${e}-`),Mt.set(e,{options:Se({env:e},r),known:new WeakSet}),St(document),t(n.join(",")).forEach(xt)})("py",{config:Zt,env:"py-script",interpreter:"pyodide",...ar,onBeforeRun(e,t){Qt=t,nr(e,t,er,"onBeforeRun")},onBeforeRunAync(e,t){Qt=t,nr(e,t,er,"onBeforeRunAync")},onAfterRun(e,t){nr(e,t,tr,"onAfterRun")},onAfterRunAsync(e,t){nr(e,t,tr,"onAfterRunAsync")},async onInterpreterReady(e,t){(({XWorker:e,interpreter:t,io:r})=>{const n=t.runPython(["import js","document=js.document","window=js",Bt,"display"].join("\n"));t.registerJsModule("pyscript",{PyWorker:function(...t){const n=e(...t);return n.onerror=({error:e})=>r.stderr(e),n},document:document,window:window,get display(){const e=Vt(Qt)?Qt.target.id:Qt.id;return(...t)=>{const r=t.at(-1);let s={target:e,append:!1};"object"==typeof r&&r&&("target"in r||"append"in r)&&(s={...s,...t.pop()}),n.callKwargs(...t,s)}}})})(e);for(const r of sr.onInterpreterReady)r(e,t);if(Vt(t)){const{attributes:{async:r,target:n}}=t,s=!!n?.value,o=s?ht(n.value):document.createElement("script-py");s||t.after(o),o.id||(o.id=Gt()),qt(t,"target",{value:o}),e["run"+(r?"Async":"")](await rr(t,e.io))}else t._pyodide.resolve(e)}});class ir extends HTMLElement{constructor(){super().id||(this.id=Gt()),this._pyodide=Promise.withResolvers(),this.srcCode="",this.executed=!1}async connectedCallback(){if(!this.executed){this.executed=!0;const{io:e,run:t}=await this._pyodide.promise;this.srcCode=await rr(this,e),this.textContent="",t(this.srcCode),this.style.display="block"}}}function cr(e,t){return $t.call(new Be(null,ar),e,{...t,type:"pyodide"})}customElements.define("py-script",ir);export{cr as PyWorker,sr as hooks};
diff --git a/pyscript.core/package-lock.json b/pyscript.core/package-lock.json
index 1631616d..18ad96b5 100644
--- a/pyscript.core/package-lock.json
+++ b/pyscript.core/package-lock.json
@@ -1,17 +1,17 @@
 {
     "name": "@pyscript/core",
-    "version": "0.1.3",
+    "version": "0.1.4",
     "lockfileVersion": 3,
     "requires": true,
     "packages": {
         "": {
             "name": "@pyscript/core",
-            "version": "0.1.3",
+            "version": "0.1.4",
             "license": "APACHE-2.0",
             "dependencies": {
                 "@ungap/with-resolvers": "^0.1.0",
                 "basic-devtools": "^0.1.6",
-                "polyscript": "^0.1.9"
+                "polyscript": "^0.1.10"
             },
             "devDependencies": {
                 "@rollup/plugin-node-resolve": "^15.1.0",
@@ -935,9 +935,9 @@
             }
         },
         "node_modules/polyscript": {
-            "version": "0.1.9",
-            "resolved": "https://registry.npmjs.org/polyscript/-/polyscript-0.1.9.tgz",
-            "integrity": "sha512-UhBcpN7FAE7MZPg10cQOXpIE9vLG6cYOrQRX37CPps4Rvl8vbUgHkzkB3qsd1DL5ztMykfeSvYPI+AIP7lx4Yw==",
+            "version": "0.1.10",
+            "resolved": "https://registry.npmjs.org/polyscript/-/polyscript-0.1.10.tgz",
+            "integrity": "sha512-NdO0inJIJyNgM8bYvD9z8aYbs1chQWq3iNtXjj7YrDT84A7IOVELPCFDlXzLU8UngpO/yQm3j4YrEoln89LbsA==",
             "dependencies": {
                 "@ungap/structured-clone": "^1.2.0",
                 "@ungap/with-resolvers": "^0.1.0",
diff --git a/pyscript.core/package.json b/pyscript.core/package.json
index 6ac0c9c9..e3e0be72 100644
--- a/pyscript.core/package.json
+++ b/pyscript.core/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@pyscript/core",
-    "version": "0.1.3",
+    "version": "0.1.4",
     "type": "module",
     "description": "PyScript",
     "main": "core.js",
@@ -32,7 +32,7 @@
     "dependencies": {
         "@ungap/with-resolvers": "^0.1.0",
         "basic-devtools": "^0.1.6",
-        "polyscript": "^0.1.9"
+        "polyscript": "^0.1.10"
     },
     "devDependencies": {
         "@rollup/plugin-node-resolve": "^15.1.0",
diff --git a/pyscript.core/src/core.js b/pyscript.core/src/core.js
index 930475e8..daa1d454 100644
--- a/pyscript.core/src/core.js
+++ b/pyscript.core/src/core.js
@@ -54,15 +54,12 @@ const after = () => {
  * It either throws an error if the 'src' can't be fetched or it returns a fallback
  * content as source.
  */
-const fetchSource = async (tag) => {
+const fetchSource = async (tag, io) => {
     if (tag.hasAttribute("src")) {
         try {
-            const response = await fetch(tag.getAttribute("src"));
-            return response.then(getText);
+            return await fetch(tag.getAttribute("src")).then(getText);
         } catch (error) {
-            // TODO _createAlertBanner(err) instead ?
-            alert(error.message);
-            throw error;
+            io.stderr(error);
         }
     }
     return tag.textContent;
@@ -105,8 +102,16 @@ const registerModule = ({ XWorker: $XWorker, interpreter, io }) => {
                 ? currentElement.target.id
                 : currentElement.id;
 
-            return (what, target = id, append = true) => {
-                pyDisplay.callKwargs(...[].concat(what), { target, append });
+            return (...args) => {
+                const last = args.at(-1);
+                let kw = { target: id, append: false };
+                if (
+                    typeof last === "object" &&
+                    last &&
+                    ("target" in last || "append" in last)
+                )
+                    kw = { ...kw, ...args.pop() };
+                pyDisplay.callKwargs(...args, kw);
             };
         },
     });
@@ -199,7 +204,9 @@ define("py", {
             // document.currentScript.target if needed
             defineProperty(element, "target", { value: show });
 
-            pyodide[`run${isAsync ? "Async" : ""}`](await fetchSource(element));
+            pyodide[`run${isAsync ? "Async" : ""}`](
+                await fetchSource(element, pyodide.io),
+            );
         } else {
             // resolve PyScriptElement to allow connectedCallback
             element._pyodide.resolve(pyodide);
@@ -217,11 +224,10 @@ class PyScriptElement extends HTMLElement {
     async connectedCallback() {
         if (!this.executed) {
             this.executed = true;
-            const { run } = await this._pyodide.promise;
-            this.srcCode = await fetchSource(this);
+            const { io, run } = await this._pyodide.promise;
+            this.srcCode = await fetchSource(this, io);
             this.textContent = "";
-            const result = run(this.srcCode);
-            if (!this.textContent && result) this.textContent = result;
+            run(this.srcCode);
             this.style.display = "block";
         }
     }
diff --git a/pyscript.core/test/index.html b/pyscript.core/test/index.html
index d7c753e4..40b56441 100644
--- a/pyscript.core/test/index.html
+++ b/pyscript.core/test/index.html
@@ -10,7 +10,7 @@
     <body>
         <script type="py">
             from pyscript import display
-            display("Hello PyScript Next")
+            display("Hello", "PyScript Next", append=False)
         </script>
     </body>
 </html>
diff --git a/pyscript.core/types/coincident/window.d.ts b/pyscript.core/types/coincident/window.d.ts
new file mode 100644
index 00000000..86a2839c
--- /dev/null
+++ b/pyscript.core/types/coincident/window.d.ts
@@ -0,0 +1,10 @@
+export { ie as default };
+declare function ie(e: any, ...r: any[]): any;
+declare namespace ie {
+    import transfer = m.transfer;
+    export { transfer };
+}
+declare function m(t: any, { parse: n, stringify: r, transform: u }?: JSON): any;
+declare namespace m {
+    function transfer(...e: any[]): any[];
+}
diff --git a/pyscript.core/types/polyscript/esm/custom.d.ts b/pyscript.core/types/polyscript/esm/custom.d.ts
new file mode 100644
index 00000000..d231cfb7
--- /dev/null
+++ b/pyscript.core/types/polyscript/esm/custom.d.ts
@@ -0,0 +1,54 @@
+export const CUSTOM_SELECTORS: any[];
+export function handleCustomType(node: Element): void;
+export function define(type: string, options: CustomOptions): void;
+export function whenDefined(type: string): Promise<object>;
+/**
+ * custom configuration
+ */
+export type Runtime = {
+    /**
+     * the bootstrapped interpreter
+     */
+    interpreter: object;
+    /**
+     * an XWorker constructor that defaults to same interpreter on the Worker.
+     */
+    XWorker: (url: string, options?: object) => Worker;
+    /**
+     * a cloned config used to bootstrap the interpreter
+     */
+    config: object;
+    /**
+     * an utility to run code within the interpreter
+     */
+    run: (code: string) => any;
+    /**
+     * an utility to run code asynchronously within the interpreter
+     */
+    runAsync: (code: string) => Promise<any>;
+    /**
+     * an utility to write a file in the virtual FS, if available
+     */
+    writeFile: (path: string, data: ArrayBuffer) => void;
+};
+/**
+ * custom configuration
+ */
+export type CustomOptions = {
+    /**
+     * the interpreter to use
+     */
+    interpreter: 'pyodide' | 'micropython' | 'wasmoon' | 'ruby-wasm-wasi';
+    /**
+     * the optional interpreter version to use
+     */
+    version?: string;
+    /**
+     * the optional config to use within such interpreter
+     */
+    config?: string;
+    /**
+     * the callback that will be invoked once
+     */
+    onInterpreterReady?: (environment: object, node: Element) => void;
+};
diff --git a/pyscript.core/types/polyscript/esm/fetch-utils.d.ts b/pyscript.core/types/polyscript/esm/fetch-utils.d.ts
new file mode 100644
index 00000000..ba68c296
--- /dev/null
+++ b/pyscript.core/types/polyscript/esm/fetch-utils.d.ts
@@ -0,0 +1,3 @@
+export function getBuffer(response: Response): Promise<ArrayBuffer>;
+export function getJSON(response: Response): Promise<any>;
+export function getText(response: Response): Promise<string>;
diff --git a/pyscript.core/types/polyscript/esm/index.d.ts b/pyscript.core/types/polyscript/esm/index.d.ts
new file mode 100644
index 00000000..7e12d538
--- /dev/null
+++ b/pyscript.core/types/polyscript/esm/index.d.ts
@@ -0,0 +1,3 @@
+export { env } from "./listeners.js";
+export const XWorker: (url: string, options?: import("./worker/class.js").WorkerOptions) => Worker;
+export { define, whenDefined } from "./custom.js";
diff --git a/pyscript.core/types/polyscript/esm/interpreter/_python.d.ts b/pyscript.core/types/polyscript/esm/interpreter/_python.d.ts
new file mode 100644
index 00000000..a6cf5b0d
--- /dev/null
+++ b/pyscript.core/types/polyscript/esm/interpreter/_python.d.ts
@@ -0,0 +1,4 @@
+export function registerJSModule(interpreter: any, name: any, value: any): void;
+export function run(interpreter: any, code: any): any;
+export function runAsync(interpreter: any, code: any): any;
+export function runEvent(interpreter: any, code: any, event: any): Promise<void>;
diff --git a/pyscript.core/types/polyscript/esm/interpreter/_utils.d.ts b/pyscript.core/types/polyscript/esm/interpreter/_utils.d.ts
new file mode 100644
index 00000000..1b0a089c
--- /dev/null
+++ b/pyscript.core/types/polyscript/esm/interpreter/_utils.d.ts
@@ -0,0 +1,15 @@
+export function clean(code: string): string;
+export const io: WeakMap<object, any>;
+export function stdio(init: any): {
+    stderr: (...args: any[]) => any;
+    stdout: (...args: any[]) => any;
+    get(engine: any): Promise<any>;
+};
+export function writeFile({ FS, PATH, PATH_FS }: {
+    FS: any;
+    PATH: any;
+    PATH_FS: any;
+}, path: any, buffer: any): any;
+export function writeFileShim(FS: any, path: any, buffer: any): any;
+export const base: WeakMap<object, any>;
+export function fetchPaths(module: any, interpreter: any, config_fetch: any): Promise<any[]>;
diff --git a/pyscript.core/types/polyscript/esm/interpreter/micropython.d.ts b/pyscript.core/types/polyscript/esm/interpreter/micropython.d.ts
new file mode 100644
index 00000000..1b5f6c7e
--- /dev/null
+++ b/pyscript.core/types/polyscript/esm/interpreter/micropython.d.ts
@@ -0,0 +1,25 @@
+declare namespace _default {
+    export { type };
+    export function module(version?: string): string;
+    export function engine({ loadMicroPython }: {
+        loadMicroPython: any;
+    }, config: any, url: any): Promise<any>;
+    export { registerJSModule };
+    export { run };
+    export { runAsync };
+    export { runEvent };
+    export function transform(_: any, value: any): any;
+    export function writeFile({ FS, _module: { PATH, PATH_FS } }: {
+        FS: any;
+        _module: {
+            PATH: any;
+            PATH_FS: any;
+        };
+    }, path: any, buffer: any): any;
+}
+export default _default;
+declare const type: "micropython";
+import { registerJSModule } from './_python.js';
+import { run } from './_python.js';
+import { runAsync } from './_python.js';
+import { runEvent } from './_python.js';
diff --git a/pyscript.core/types/polyscript/esm/interpreter/pyodide.d.ts b/pyscript.core/types/polyscript/esm/interpreter/pyodide.d.ts
new file mode 100644
index 00000000..c701caf0
--- /dev/null
+++ b/pyscript.core/types/polyscript/esm/interpreter/pyodide.d.ts
@@ -0,0 +1,25 @@
+declare namespace _default {
+    export { type };
+    export function module(version?: string): string;
+    export function engine({ loadPyodide }: {
+        loadPyodide: any;
+    }, config: any, url: any): Promise<any>;
+    export { registerJSModule };
+    export { run };
+    export { runAsync };
+    export { runEvent };
+    export function transform(interpreter: any, value: any): any;
+    export function writeFile({ FS, PATH, _module: { PATH_FS } }: {
+        FS: any;
+        PATH: any;
+        _module: {
+            PATH_FS: any;
+        };
+    }, path: any, buffer: any): any;
+}
+export default _default;
+declare const type: "pyodide";
+import { registerJSModule } from './_python.js';
+import { run } from './_python.js';
+import { runAsync } from './_python.js';
+import { runEvent } from './_python.js';
diff --git a/pyscript.core/types/polyscript/esm/interpreter/ruby-wasm-wasi.d.ts b/pyscript.core/types/polyscript/esm/interpreter/ruby-wasm-wasi.d.ts
new file mode 100644
index 00000000..fc8568d5
--- /dev/null
+++ b/pyscript.core/types/polyscript/esm/interpreter/ruby-wasm-wasi.d.ts
@@ -0,0 +1,16 @@
+declare namespace _default {
+    export { type };
+    export let experimental: boolean;
+    export function module(version?: string): string;
+    export function engine({ DefaultRubyVM }: {
+        DefaultRubyVM: any;
+    }, config: any, url: any): Promise<any>;
+    export function registerJSModule(interpreter: any, _: any, value: any): void;
+    export function run(interpreter: any, code: any): any;
+    export function runAsync(interpreter: any, code: any): any;
+    export function runEvent(interpreter: any, code: any, event: any): Promise<void>;
+    export function transform(_: any, value: any): any;
+    export function writeFile(): never;
+}
+export default _default;
+declare const type: "ruby-wasm-wasi";
diff --git a/pyscript.core/types/polyscript/esm/interpreter/wasmoon.d.ts b/pyscript.core/types/polyscript/esm/interpreter/wasmoon.d.ts
new file mode 100644
index 00000000..5f0dca9d
--- /dev/null
+++ b/pyscript.core/types/polyscript/esm/interpreter/wasmoon.d.ts
@@ -0,0 +1,22 @@
+declare namespace _default {
+    export { type };
+    export function module(version?: string): string;
+    export function engine({ LuaFactory, LuaLibraries }: {
+        LuaFactory: any;
+        LuaLibraries: any;
+    }, config: any): Promise<any>;
+    export function registerJSModule(interpreter: any, _: any, value: any): void;
+    export function run(interpreter: any, code: any): any;
+    export function runAsync(interpreter: any, code: any): any;
+    export function runEvent(interpreter: any, code: any, event: any): Promise<void>;
+    export function transform(_: any, value: any): any;
+    export function writeFile({ cmodule: { module: { FS }, }, }: {
+        cmodule: {
+            module: {
+                FS: any;
+            };
+        };
+    }, path: any, buffer: any): any;
+}
+export default _default;
+declare const type: "wasmoon";
diff --git a/pyscript.core/types/polyscript/esm/interpreters.d.ts b/pyscript.core/types/polyscript/esm/interpreters.d.ts
new file mode 100644
index 00000000..ef35e452
--- /dev/null
+++ b/pyscript.core/types/polyscript/esm/interpreters.d.ts
@@ -0,0 +1,9 @@
+/** @type {Map<string, object>} */
+export const registry: Map<string, object>;
+/** @type {Map<string, object>} */
+export const configs: Map<string, object>;
+/** @type {string[]} */
+export const selectors: string[];
+/** @type {string[]} */
+export const prefixes: string[];
+export const interpreter: Map<any, any>;
diff --git a/pyscript.core/types/polyscript/esm/listeners.d.ts b/pyscript.core/types/polyscript/esm/listeners.d.ts
new file mode 100644
index 00000000..98f55b0c
--- /dev/null
+++ b/pyscript.core/types/polyscript/esm/listeners.d.ts
@@ -0,0 +1,3 @@
+export const env: any;
+export function listener(event: any): Promise<void>;
+export function addAllListeners(root: Document | Element): void;
diff --git a/pyscript.core/types/polyscript/esm/loader.d.ts b/pyscript.core/types/polyscript/esm/loader.d.ts
new file mode 100644
index 00000000..02350ce0
--- /dev/null
+++ b/pyscript.core/types/polyscript/esm/loader.d.ts
@@ -0,0 +1,2 @@
+export function getRuntime(id: string, config?: string, options?: object): Promise<any>;
+export function getRuntimeID(type: string, version?: string): string;
diff --git a/pyscript.core/types/polyscript/esm/script-handler.d.ts b/pyscript.core/types/polyscript/esm/script-handler.d.ts
new file mode 100644
index 00000000..a8e029c0
--- /dev/null
+++ b/pyscript.core/types/polyscript/esm/script-handler.d.ts
@@ -0,0 +1,4 @@
+export function queryTarget(script: any, idOrSelector: any): any;
+export const interpreters: Map<any, any>;
+export function getDetails(type: any, id: any, name: any, version: any, config: any, runtime?: any): any;
+export function handle(script: HTMLScriptElement): Promise<void>;
diff --git a/pyscript.core/types/polyscript/esm/toml.d.ts b/pyscript.core/types/polyscript/esm/toml.d.ts
new file mode 100644
index 00000000..d86d9471
--- /dev/null
+++ b/pyscript.core/types/polyscript/esm/toml.d.ts
@@ -0,0 +1 @@
+export function parse(text: string): object;
diff --git a/pyscript.core/types/polyscript/esm/utils.d.ts b/pyscript.core/types/polyscript/esm/utils.d.ts
new file mode 100644
index 00000000..b62f2241
--- /dev/null
+++ b/pyscript.core/types/polyscript/esm/utils.d.ts
@@ -0,0 +1,29 @@
+export const isArray: (arg: any) => arg is any[];
+export const assign: {
+    <T extends {}, U>(target: T, source: U): T & U;
+    <T_1 extends {}, U_1, V>(target: T_1, source1: U_1, source2: V): T_1 & U_1 & V;
+    <T_2 extends {}, U_2, V_1, W>(target: T_2, source1: U_2, source2: V_1, source3: W): T_2 & U_2 & V_1 & W;
+    (target: object, ...sources: any[]): any;
+};
+export const create: {
+    (o: object): any;
+    (o: object, properties: PropertyDescriptorMap & ThisType<any>): any;
+};
+export const defineProperties: <T>(o: T, properties: PropertyDescriptorMap & ThisType<any>) => T;
+export const defineProperty: <T>(o: T, p: PropertyKey, attributes: PropertyDescriptor & ThisType<any>) => T;
+export const entries: {
+    <T>(o: {
+        [s: string]: T;
+    } | ArrayLike<T>): [string, T][];
+    (o: {}): [string, any][];
+};
+export const all: {
+    <T>(values: Iterable<T | PromiseLike<T>>): Promise<Awaited<T>[]>;
+    <T_1 extends [] | readonly unknown[]>(values: T_1): Promise<{ -readonly [P in keyof T_1]: Awaited<T_1[P]>; }>;
+};
+export const resolve: {
+    (): Promise<void>;
+    <T>(value: T): Promise<Awaited<T>>;
+    <T_1>(value: T_1 | PromiseLike<T_1>): Promise<Awaited<T_1>>;
+};
+export function absoluteURL(path: any, base?: string): string;
diff --git a/pyscript.core/types/polyscript/esm/worker/class.d.ts b/pyscript.core/types/polyscript/esm/worker/class.d.ts
new file mode 100644
index 00000000..0845d4d2
--- /dev/null
+++ b/pyscript.core/types/polyscript/esm/worker/class.d.ts
@@ -0,0 +1,19 @@
+declare function _default(...args: any[]): (url: string, options?: WorkerOptions) => Worker;
+export default _default;
+/**
+ * custom configuration
+ */
+export type WorkerOptions = {
+    /**
+     * the interpreter type to use
+     */
+    type: string;
+    /**
+     * the optional interpreter version to use
+     */
+    version?: string;
+    /**
+     * the optional config to use within such interpreter
+     */
+    config?: string;
+};
diff --git a/pyscript.core/types/polyscript/esm/worker/hooks.d.ts b/pyscript.core/types/polyscript/esm/worker/hooks.d.ts
new file mode 100644
index 00000000..ea2da89f
--- /dev/null
+++ b/pyscript.core/types/polyscript/esm/worker/hooks.d.ts
@@ -0,0 +1,6 @@
+export class Hook {
+    constructor(interpreter: any, options: any);
+    interpreter: any;
+    onWorkerReady: any;
+    get stringHooks(): {};
+}
diff --git a/pyscript.core/types/polyscript/esm/worker/xworker.d.ts b/pyscript.core/types/polyscript/esm/worker/xworker.d.ts
new file mode 100644
index 00000000..5575be5a
--- /dev/null
+++ b/pyscript.core/types/polyscript/esm/worker/xworker.d.ts
@@ -0,0 +1,2 @@
+declare function _default(): Worker;
+export default _default;
diff --git a/pyscript.core/types/pyscript/pyscript.core/src/core.d.ts b/pyscript.core/types/pyscript/pyscript.core/src/core.d.ts
new file mode 100644
index 00000000..54e52757
--- /dev/null
+++ b/pyscript.core/types/pyscript/pyscript.core/src/core.d.ts
@@ -0,0 +1,25 @@
+/**
+ * A `Worker` facade able to bootstrap on the worker thread only a PyScript module.
+ * @param {string} file the python file to run ina worker.
+ * @param {{config?: string | object, async?: boolean}} [options] optional configuration for the worker.
+ * @returns {Worker & {sync: ProxyHandler<object>}}
+ */
+export function PyWorker(file: string, options?: {
+    config?: string | object;
+    async?: boolean;
+}): Worker & {
+    sync: ProxyHandler<object>;
+};
+export namespace hooks {
+    let onBeforeRun: Set<Function>;
+    let onBeforeRunAync: Set<Function>;
+    let onAfterRun: Set<Function>;
+    let onAfterRunAsync: Set<Function>;
+    let onInterpreterReady: Set<Function>;
+    let codeBeforeRunWorker: Set<string>;
+    let codeBeforeRunWorkerAsync: Set<string>;
+    let codeAfterRunWorker: Set<string>;
+    let codeAfterRunWorkerAsync: Set<string>;
+}
+declare let config: any;
+export {};
diff --git a/pyscript.core/types/pyscript/pyscript.core/src/exceptions.d.ts b/pyscript.core/types/pyscript/pyscript.core/src/exceptions.d.ts
new file mode 100644
index 00000000..138ddfdd
--- /dev/null
+++ b/pyscript.core/types/pyscript/pyscript.core/src/exceptions.d.ts
@@ -0,0 +1,27 @@
+export function _createAlertBanner(message: any, level: any, messageType?: string, logMessage?: boolean): void;
+export namespace ErrorCode {
+    let GENERIC: string;
+    let FETCH_ERROR: string;
+    let FETCH_NAME_ERROR: string;
+    let FETCH_UNAUTHORIZED_ERROR: string;
+    let FETCH_FORBIDDEN_ERROR: string;
+    let FETCH_NOT_FOUND_ERROR: string;
+    let FETCH_SERVER_ERROR: string;
+    let FETCH_UNAVAILABLE_ERROR: string;
+    let BAD_CONFIG: string;
+    let MICROPIP_INSTALL_ERROR: string;
+    let BAD_PLUGIN_FILE_EXTENSION: string;
+    let NO_DEFAULT_EXPORT: string;
+    let TOP_LEVEL_AWAIT: string;
+}
+export class UserError extends Error {
+    constructor(errorCode: any, message?: string, messageType?: string);
+    errorCode: any;
+    messageType: string;
+}
+export class FetchError extends UserError {
+    constructor(errorCode: any, message: any);
+}
+export class InstallError extends UserError {
+    constructor(errorCode: any, message: any);
+}
diff --git a/pyscript.core/types/pyscript/pyscript.core/src/fetch.d.ts b/pyscript.core/types/pyscript/pyscript.core/src/fetch.d.ts
new file mode 100644
index 00000000..5921ebb6
--- /dev/null
+++ b/pyscript.core/types/pyscript/pyscript.core/src/fetch.d.ts
@@ -0,0 +1,10 @@
+/**
+ * This is a fetch wrapper that handles any non 200 responses and throws a
+ * FetchError with the right ErrorCode. This is useful because our FetchError
+ * will automatically create an alert banner.
+ *
+ * @param {string} url - URL to fetch
+ * @param {Request} [options] - options to pass to fetch
+ * @returns {Promise<Response>}
+ */
+export function robustFetch(url: string, options?: Request): Promise<Response>;
