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hot-reload-injected-script.js
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hot-reload-injected-script.js
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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
// @ts-check
/// <reference path='debugger-scripts-api.d.ts' />
const path = require('path');
const fsPromise = require('fs/promises');
const parcelWatcher = require('@parcel/watcher');
// This file is loaded by the vscode-diagnostic-tools extension and injected into the debugger.
/** @type {RunFunction} */
module.exports.run = async function (debugSession) {
const watcher = await DirWatcher.watchRecursively(path.join(__dirname, '../out/'));
const sub = watcher.onDidChange(changes => {
const supportedChanges = changes.filter(c => c.path.endsWith('.js') || c.path.endsWith('.css'));
debugSession.evalJs(function (changes, debugSessionName) {
// This function is stringified and injected into the debuggee.
/** @type {{ count: number; originalWindowTitle: any; timeout: any; shouldReload: boolean }} */
const hotReloadData = globalThis.$hotReloadData || (globalThis.$hotReloadData = { count: 0, messageHideTimeout: undefined, shouldReload: false });
/**
* @param {string} path
* @param {string} newSrc
*/
function handleChange(path, newSrc) {
const relativePath = path.replace(/\\/g, '/').split('/out/')[1];
if (relativePath.endsWith('.css')) {
handleCssChange(relativePath);
} else if (relativePath.endsWith('.js')) {
handleJsChange(relativePath, newSrc);
}
}
/**
* @param {string} relativePath
*/
function handleCssChange(relativePath) {
if (typeof document === 'undefined') {
return;
}
const styleSheet = (/** @type {HTMLLinkElement[]} */ ([...document.querySelectorAll(`link[rel='stylesheet']`)]))
.find(l => new URL(l.href, document.location.href).pathname.endsWith(relativePath));
if (styleSheet) {
setMessage(`reload ${formatPath(relativePath)} - ${new Date().toLocaleTimeString()}`);
console.log(debugSessionName, 'css reloaded', relativePath);
styleSheet.href = styleSheet.href.replace(/\?.*/, '') + '?' + Date.now();
} else {
setMessage(`could not reload ${formatPath(relativePath)} - ${new Date().toLocaleTimeString()}`);
console.log(debugSessionName, 'ignoring css change, as stylesheet is not loaded', relativePath);
}
}
/**
* @param {string} relativePath
* @param {string} newSrc
*/
function handleJsChange(relativePath, newSrc) {
const moduleIdStr = trimEnd(relativePath, '.js');
/** @type {any} */
const requireFn = globalThis.require;
const moduleManager = requireFn.moduleManager;
if (!moduleManager) {
console.log(debugSessionName, 'ignoring js change, as moduleManager is not available', relativePath);
return;
}
const moduleId = moduleManager._moduleIdProvider.getModuleId(moduleIdStr);
const oldModule = moduleManager._modules2[moduleId];
if (!oldModule) {
console.log(debugSessionName, 'ignoring js change, as module is not loaded', relativePath);
return;
}
// Check if we can reload
const g = /** @type {GlobalThisAddition} */ (globalThis);
// A frozen copy of the previous exports
const oldExports = Object.freeze({ ...oldModule.exports });
const reloadFn = g.$hotReload_applyNewExports?.(oldExports);
if (!reloadFn) {
console.log(debugSessionName, 'ignoring js change, as module does not support hot-reload', relativePath);
hotReloadData.shouldReload = true;
setMessage(`hot reload not supported for ${formatPath(relativePath)} - ${new Date().toLocaleTimeString()}`);
return;
}
const newScript = new Function('define', newSrc); // CodeQL [SM01632] This code is only executed during development. It is required for the hot-reload functionality.
newScript(/* define */ function (deps, callback) {
// Evaluating the new code was successful.
// Redefine the module
delete moduleManager._modules2[moduleId];
moduleManager.defineModule(moduleIdStr, deps, callback);
const newModule = moduleManager._modules2[moduleId];
// Patch the exports of the old module, so that modules using the old module get the new exports
Object.assign(oldModule.exports, newModule.exports);
// We override the exports so that future reloads still patch the initial exports.
newModule.exports = oldModule.exports;
const successful = reloadFn(newModule.exports);
if (!successful) {
hotReloadData.shouldReload = true;
setMessage(`hot reload failed ${formatPath(relativePath)} - ${new Date().toLocaleTimeString()}`);
console.log(debugSessionName, 'hot reload was not successful', relativePath);
return;
}
console.log(debugSessionName, 'hot reloaded', moduleIdStr);
setMessage(`successfully reloaded ${formatPath(relativePath)} - ${new Date().toLocaleTimeString()}`);
});
}
/**
* @param {string} message
*/
function setMessage(message) {
const domElem = /** @type {HTMLDivElement | undefined} */ (document.querySelector('.titlebar-center .window-title'));
if (!domElem) { return; }
if (!hotReloadData.timeout) {
hotReloadData.originalWindowTitle = domElem.innerText;
} else {
clearTimeout(hotReloadData.timeout);
}
if (hotReloadData.shouldReload) {
message += ' (manual reload required)';
}
domElem.innerText = message;
hotReloadData.timeout = setTimeout(() => {
hotReloadData.timeout = undefined;
// If wanted, we can restore the previous title message
// domElem.replaceChildren(hotReloadData.originalWindowTitle);
}, 5000);
}
/**
* @param {string} path
* @returns {string}
*/
function formatPath(path) {
const parts = path.split('/');
parts.reverse();
let result = parts[0];
parts.shift();
for (const p of parts) {
if (result.length + p.length > 40) {
break;
}
result = p + '/' + result;
if (result.length > 20) {
break;
}
}
return result;
}
function trimEnd(str, suffix) {
if (str.endsWith(suffix)) {
return str.substring(0, str.length - suffix.length);
}
return str;
}
for (const change of changes) {
handleChange(change.path, change.newContent);
}
}, supportedChanges, debugSession.name.substring(0, 25));
});
return {
dispose() {
sub.dispose();
watcher.dispose();
}
};
};
class DirWatcher {
/**
*
* @param {string} dir
* @returns {Promise<DirWatcher>}
*/
static async watchRecursively(dir) {
/** @type {((changes: { path: string, newContent: string }[]) => void)[]} */
const listeners = [];
/** @type {Map<string, string> } */
const fileContents = new Map();
/** @type {Map<string, { path: string, newContent: string }>} */
const changes = new Map();
/** @type {(handler: (changes: { path: string, newContent: string }[]) => void) => IDisposable} */
const event = (handler) => {
listeners.push(handler);
return {
dispose: () => {
const idx = listeners.indexOf(handler);
if (idx >= 0) {
listeners.splice(idx, 1);
}
}
};
};
const r = parcelWatcher.subscribe(dir, async (err, events) => {
for (const e of events) {
if (e.type === 'update') {
const newContent = await fsPromise.readFile(e.path, 'utf8');
if (fileContents.get(e.path) !== newContent) {
fileContents.set(e.path, newContent);
changes.set(e.path, { path: e.path, newContent });
}
}
}
if (changes.size > 0) {
debounce(() => {
const uniqueChanges = Array.from(changes.values());
changes.clear();
listeners.forEach(l => l(uniqueChanges));
})();
}
});
const result = await r;
return new DirWatcher(event, () => result.unsubscribe());
}
/**
* @param {(handler: (changes: { path: string, newContent: string }[]) => void) => IDisposable} onDidChange
* @param {() => void} unsub
*/
constructor(onDidChange, unsub) {
this.onDidChange = onDidChange;
this.unsub = unsub;
}
dispose() {
this.unsub();
}
}
/**
* Debounce function calls
* @param {() => void} fn
* @param {number} delay
*/
function debounce(fn, delay = 50) {
let timeoutId;
return function (...args) {
clearTimeout(timeoutId);
timeoutId = setTimeout(() => {
fn.apply(this, args);
}, delay);
};
}