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fix(mobile): use split/join for import() patch, gate behind Chrome<63 check

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The regex /\bimport\(/g inside a template literal corrupts \b into a
backspace and \( into (, producing an unterminated-group SyntaxError in the
WebView. Use split().join() instead — no escape sequences, no corruption.

Modern WebViews (Chrome 63+) keep the original clean <script>-tag path.
Old WebViews (Karoo Chrome 61) take the fetch+patch+Blob path.
This commit is contained in:
Davide Scaini
2026-04-26 15:05:33 +02:00
parent 1410be7427
commit f6885fecfa
1 changed files with 38 additions and 31 deletions
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mobile/extraction/PyodideWebView.tsx
+38 -31
View File
@@ -77,40 +77,47 @@ var initError = null;
try {
_post({ type: 'progress', msg: 'Loading Python runtime…' });
// Chrome <63 (e.g. Karoo WebView 61) cannot parse the dynamic import()
// syntax that Pyodide uses to load pyodide.asm.js. The parser rejects
// the whole file before it runs, so loadPyodide is never defined.
//
// Fix: fetch pyodide.js as text, replace every "import(" with a
// script-tag–based loader that Chrome 61 can execute, then inject the
// patched code via a Blob URL. The Blob script is never parsed by the
// module-aware pre-scanner, so the import keyword is invisible to it.
window.__loadScript = function(url) {
return new Promise(function(res, rej) {
// Chrome <63 cannot parse dynamic import() — a parse-time SyntaxError
// prevents loadPyodide from ever being defined. Detect this once and
// use a patched loader only for those old WebViews.
var chromeVer = (navigator.userAgent.match(/Chrome\\/([0-9]+)/) || [])[1];
var needsPatch = chromeVer && parseInt(chromeVer) < 63;
if (needsPatch) {
// Fetch pyodide.js as text and replace every "import(" with a
// script-tag shim before injecting via Blob URL. Using split/join
// avoids regex escape sequences, which template literals corrupt.
// Node.js import("path") calls are guarded by IN_NODE and never run.
window.__loadScript = function(url) {
return new Promise(function(res, rej) {
var s = document.createElement('script');
s.src = url;
s.onload = res;
s.onerror = function() { rej(new Error('Failed to load ' + url)); };
document.head.appendChild(s);
});
};
var pyResp = await fetch(_CDN + 'pyodide.js');
if (!pyResp.ok) throw new Error('Could not fetch pyodide.js (' + pyResp.status + ')');
var pyCode = await pyResp.text();
pyCode = pyCode.split('import(').join('__loadScript(');
await new Promise(function(res, rej) {
var blob = new Blob([pyCode], { type: 'application/javascript' });
var blobUrl = URL.createObjectURL(blob);
var s = document.createElement('script');
s.src = url;
s.onload = res;
s.onerror = function() { rej(new Error('Failed to load ' + url)); };
s.src = blobUrl;
s.onload = function() { URL.revokeObjectURL(blobUrl); res(); };
s.onerror = function() { URL.revokeObjectURL(blobUrl); rej(new Error('Failed to execute patched pyodide.js')); };
document.head.appendChild(s);
});
};
var pyResp = await fetch(_CDN + 'pyodide.js');
if (!pyResp.ok) throw new Error('Could not fetch pyodide.js (' + pyResp.status + ')');
var pyCode = await pyResp.text();
// Replace all dynamic import() calls. Node.js-only paths (importing
// "path", "fs", etc.) are guarded by IN_NODE and never run in WebView.
pyCode = pyCode.replace(/\bimport\(/g, '__loadScript(');
await new Promise(function(res, rej) {
var blob = new Blob([pyCode], { type: 'application/javascript' });
var blobUrl = URL.createObjectURL(blob);
var s = document.createElement('script');
s.src = blobUrl;
s.onload = function() { URL.revokeObjectURL(blobUrl); res(); };
s.onerror = function() { URL.revokeObjectURL(blobUrl); rej(new Error('Failed to execute patched pyodide.js')); };
document.head.appendChild(s);
});
} else {
await new Promise(function(res, rej) {
var s = document.createElement('script');
s.src = _CDN + 'pyodide.js';
s.onload = res; s.onerror = rej;
document.head.appendChild(s);
});
}
pyodide = await loadPyodide({ indexURL: _CDN });