riot-web/webpack.config.js

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/* eslint-disable quote-props */
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const dotenv = require("dotenv");
const path = require("path");
const webpack = require("webpack");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const TerserPlugin = require("terser-webpack-plugin");
const OptimizeCSSAssetsPlugin = require("optimize-css-assets-webpack-plugin");
const HtmlWebpackInjectPreload = require("@principalstudio/html-webpack-inject-preload");
const { sentryWebpackPlugin } = require("@sentry/webpack-plugin");
const crypto = require("crypto");
// XXX: mangle Crypto::createHash to replace md4 with sha256, output.hashFunction is insufficient as multiple bits
// of webpack hardcode md4. The proper fix it to upgrade to webpack 5.
const createHash = crypto.createHash;
crypto.createHash = (algorithm, options) => createHash(algorithm === "md4" ? "sha256" : algorithm, options);
// Environment variables
// RIOT_OG_IMAGE_URL: specifies the URL to the image which should be used for the opengraph logo.
// CSP_EXTRA_SOURCE: specifies a URL which should be appended to each CSP directive which uses 'self',
// this can be helpful if your deployment has redirects for old bundles, such as develop.element.io.
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dotenv.config();
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let ogImageUrl = process.env.RIOT_OG_IMAGE_URL;
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if (!ogImageUrl) ogImageUrl = "https://app.element.io/themes/element/img/logos/opengraph.png";
if (!process.env.VERSION) {
console.warn("Unset VERSION variable - this may affect build output");
process.env.VERSION = "!!UNSET!!";
}
const cssThemes = {
// CSS themes
"theme-legacy-light": "./node_modules/matrix-react-sdk/res/themes/legacy-light/css/legacy-light.pcss",
"theme-legacy-dark": "./node_modules/matrix-react-sdk/res/themes/legacy-dark/css/legacy-dark.pcss",
"theme-light": "./node_modules/matrix-react-sdk/res/themes/light/css/light.pcss",
"theme-light-high-contrast":
"./node_modules/matrix-react-sdk/res/themes/light-high-contrast/css/light-high-contrast.pcss",
"theme-dark": "./node_modules/matrix-react-sdk/res/themes/dark/css/dark.pcss",
"theme-light-custom": "./node_modules/matrix-react-sdk/res/themes/light-custom/css/light-custom.pcss",
"theme-dark-custom": "./node_modules/matrix-react-sdk/res/themes/dark-custom/css/dark-custom.pcss",
};
function getActiveThemes() {
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// Default to `light` theme when the MATRIX_THEMES environment variable is not defined.
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const theme = process.env.MATRIX_THEMES ?? "light";
return theme
.split(",")
.map((x) => x.trim())
.filter(Boolean);
}
// See docs/customisations.md
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let fileOverrides = {
/* {[file: string]: string} */
};
try {
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fileOverrides = require("./customisations.json");
// stringify the output so it appears in logs correctly, as large files can sometimes get
// represented as `<Object>` which is less than helpful.
console.log("Using customisations.json : " + JSON.stringify(fileOverrides, null, 4));
process.on("exit", () => {
console.log(""); // blank line
console.warn("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
console.warn("!! Customisations have been deprecated and will be removed in a future release !!");
console.warn("!! See https://github.com/vector-im/element-web/blob/develop/docs/customisations.md !!");
console.warn("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
console.log(""); // blank line
});
} catch (e) {
// ignore - not important
}
function parseOverridesToReplacements(overrides) {
return Object.entries(overrides).map(([oldPath, newPath]) => {
return new webpack.NormalModuleReplacementPlugin(
// because the input is effectively defined by the person running the build, we don't
// need to do anything special to protect against regex overrunning, etc.
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new RegExp(oldPath.replace(/\//g, "[\\/\\\\]").replace(/\./g, "\\.")),
path.resolve(__dirname, newPath),
);
});
}
const moduleReplacementPlugins = [
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...parseOverridesToReplacements(require("./components.json")),
// Allow customisations to override the default components too
...parseOverridesToReplacements(fileOverrides),
];
module.exports = (env, argv) => {
// Establish settings based on the environment and args.
//
// argv.mode is always set to "production" by yarn build
// (called to build prod, nightly and develop.element.io)
// arg.mode is set to "development" by yarn start
// (called by developers, runs the continuous reload script)
// process.env.CI_PACKAGE is set when yarn build is called from scripts/ci_package.sh
// (called to build nightly and develop.element.io)
const nodeEnv = argv.mode;
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const devMode = nodeEnv !== "production";
const useHMR = process.env.CSS_HOT_RELOAD === "1" && devMode;
const enableMinification = !devMode && !process.env.CI_PACKAGE;
const development = {};
if (devMode) {
// Embedded source maps for dev builds, can't use eval-source-map due to CSP
development["devtool"] = "inline-source-map";
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} else {
if (process.env.CI_PACKAGE) {
// High quality source maps in separate .map files which include the source. This doesn't bulk up the .js
// payload file size, which is nice for performance but also necessary to get the bundle to a small enough
// size that sentry will accept the upload.
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development["devtool"] = "source-map";
} else {
// High quality source maps in separate .map files which don't include the source
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development["devtool"] = "nosources-source-map";
}
}
// Resolve the directories for the react-sdk and js-sdk for later use. We resolve these early, so we
// don't have to call them over and over. We also resolve to the package.json instead of the src
// directory, so we don't have to rely on an index.js or similar file existing.
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const reactSdkSrcDir = path.resolve(require.resolve("matrix-react-sdk/package.json"), "..", "src");
const jsSdkSrcDir = path.resolve(require.resolve("matrix-js-sdk/package.json"), "..", "src");
const ACTIVE_THEMES = getActiveThemes();
function getThemesImports() {
const imports = ACTIVE_THEMES.map((t) => {
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return cssThemes[`theme-${t}`].replace("./node_modules/", ""); // theme import path
});
const s = JSON.stringify(ACTIVE_THEMES);
return `
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window.MX_insertedThemeStylesCounter = 0;
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window.MX_DEV_ACTIVE_THEMES = (${s});
${imports.map((i) => `import("${i}")`).join("\n")};
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`;
}
return {
...development,
bail: true,
node: {
// Mock out the NodeFS module: The opus decoder imports this wrongly.
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fs: "empty",
net: "empty",
tls: "empty",
crypto: "empty",
},
entry: {
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bundle: "./src/vector/index.ts",
mobileguide: "./src/vector/mobile_guide/index.ts",
jitsi: "./src/vector/jitsi/index.ts",
usercontent: "./node_modules/matrix-react-sdk/src/usercontent/index.ts",
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...(useHMR ? {} : cssThemes),
},
optimization: {
// Put all of our CSS into one useful place - this is needed for MiniCssExtractPlugin.
// Previously we used a different extraction plugin that did this magic for us, but
// now we need to consider that the CSS needs to be bundled up together.
splitChunks: {
cacheGroups: {
styles: {
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name: "styles",
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test: /\.css$/,
enforce: true,
// Do not add `chunks: 'all'` here because you'll break the app entry point.
},
// put the unhomoglyph data in its own file. It contains
// magic characters which mess up line numbers in the
// javascript debugger.
unhomoglyph_data: {
name: "unhomoglyph_data",
test: /unhomoglyph\/data\.json$/,
enforce: true,
chunks: "all",
},
default: {
reuseExistingChunk: true,
},
},
},
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// This fixes duplicate files showing up in chrome with sourcemaps enabled.
// See https://github.com/webpack/webpack/issues/7128 for more info.
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namedModules: false,
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// Minification is normally enabled by default for webpack in production mode, but
// we use a CSS optimizer too and need to manage it ourselves.
minimize: enableMinification,
minimizer: enableMinification ? [new TerserPlugin({}), new OptimizeCSSAssetsPlugin({})] : [],
// Set the value of `process.env.NODE_ENV` for libraries like React
// See also https://v4.webpack.js.org/configuration/optimization/#optimizationnodeenv
nodeEnv,
},
resolve: {
// We define an alternative import path so we can safely use src/ across the react-sdk
// and js-sdk. We already import from src/ where possible to ensure our source maps are
// extremely accurate (and because we're capable of compiling the layers manually rather
// than relying on partially-mangled output from babel), though we do need to fix the
// package level import (stuff like `import {Thing} from "matrix-js-sdk"` for example).
// We can't use the aliasing down below to point at src/ because that'll fail to resolve
// the package.json for the dependency. Instead, we rely on the package.json of each
// layer to have our custom alternate fields to load things in the right order. These are
// the defaults of webpack prepended with `matrix_src_`.
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mainFields: ["matrix_src_browser", "matrix_src_main", "browser", "main"],
aliasFields: ["matrix_src_browser", "browser"],
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// We need to specify that TS can be resolved without an extension
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extensions: [".js", ".json", ".ts", ".tsx"],
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alias: {
// alias any requires to the react module to the one in our path,
// otherwise we tend to get the react source included twice when
// using `npm link` / `yarn link`.
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"react": path.resolve(__dirname, "node_modules/react"),
"react-dom": path.resolve(__dirname, "node_modules/react-dom"),
// Same goes for js/react-sdk - we don't need two copies.
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"matrix-js-sdk": path.resolve(__dirname, "node_modules/matrix-js-sdk"),
"matrix-react-sdk": path.resolve(__dirname, "node_modules/matrix-react-sdk"),
"@matrix-org/react-sdk-module-api": path.resolve(
__dirname,
"node_modules/@matrix-org/react-sdk-module-api",
),
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// and matrix-events-sdk & matrix-widget-api
"matrix-events-sdk": path.resolve(__dirname, "node_modules/matrix-events-sdk"),
"matrix-widget-api": path.resolve(__dirname, "node_modules/matrix-widget-api"),
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// Define a variable so the i18n stuff can load
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"$webapp": path.resolve(__dirname, "webapp"),
},
},
module: {
noParse: [
// for cross platform compatibility use [\\\/] as the path separator
// this ensures that the regex trips on both Windows and *nix
// don't parse the languages within highlight.js. They cause stack
// overflows (https://github.com/webpack/webpack/issues/1721), and
// there is no need for webpack to parse them - they can just be
// included as-is.
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/highlight\.js[\\/]lib[\\/]languages/,
// olm takes ages for webpack to process, and it's already heavily
// optimised, so there is little to gain by us uglifying it.
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/olm[\\/](javascript[\\/])?olm\.js$/,
],
rules: [
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useHMR && {
test: /devcss\.ts$/,
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loader: "string-replace-loader",
options: {
search: '"use theming";',
replace: getThemesImports(),
},
},
{
test: /\.worker\.ts$/,
loader: "worker-loader",
options: {
// Prevent bundling workers since CSP forbids loading them
// from another origin.
filename: "[hash].worker.js",
},
},
{
test: /\.(ts|js)x?$/,
include: (f) => {
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// our own source needs babel-ing
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if (f.startsWith(path.resolve(__dirname, "src"))) return true;
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// we use the original source files of react-sdk and js-sdk, so we need to
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// run them through babel. Because the path tested is the resolved, absolute
// path, these could be anywhere thanks to yarn link. We must also not
// include node modules inside these modules, so we add 'src'.
if (f.startsWith(reactSdkSrcDir)) return true;
if (f.startsWith(jsSdkSrcDir)) return true;
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// Some of the syntax in this package is not understood by
// either webpack or our babel setup.
// When we do get to upgrade our current setup, this should
// probably be removed.
if (f.includes(path.join("@vector-im", "compound-web"))) return true;
// but we can't run all of our dependencies through babel (many of them still
// use module.exports which breaks if babel injects an 'include' for its
// polyfills: probably fixable but babeling all our dependencies is probably
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// not necessary anyway). So, for anything else, don't babel.
return false;
},
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loader: "babel-loader",
options: {
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cacheDirectory: true,
},
},
{
test: /\.css$/,
use: [
MiniCssExtractPlugin.loader,
{
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loader: "css-loader",
options: {
importLoaders: 1,
sourceMap: true,
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},
},
{
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loader: "postcss-loader",
ident: "postcss",
options: {
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"sourceMap": true,
"plugins": () => [
// Note that we use significantly fewer plugins on the plain
// CSS parser. If we start to parse plain CSS, we end with all
// kinds of nasty problems (like stylesheets not loading).
//
// You might have noticed that we're also sending regular CSS
// through PostCSS. This looks weird, and in fact is probably
// not what you'd expect, however in order for our CSS build
// to work nicely we have to do this. Because down the line
// our SCSS stylesheets reference plain CSS we have to load
// the plain CSS through PostCSS so it can find it safely. This
// also acts like a babel-for-css by transpiling our (S)CSS
// down/up to the right browser support (prefixes, etc).
// Further, if we don't do this then PostCSS assumes that our
// plain CSS is SCSS and it really doesn't like that, even
// though plain CSS should be compatible. The chunking options
// at the top of this webpack config help group the SCSS and
// plain CSS together for the bundler.
require("postcss-simple-vars")(),
require("postcss-hexrgba")(),
// It's important that this plugin is last otherwise we end
// up with broken CSS.
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require("postcss-preset-env")({ stage: 3, browsers: "last 2 versions" }),
],
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"parser": "postcss-scss",
"local-plugins": true,
},
},
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],
},
{
test: /\.pcss$/,
use: [
/**
* This code is hopeful that no .pcss outside of our themes will be directly imported in any
* of the JS/TS files.
* Should be MUCH better with webpack 5, but we're stuck to this solution for now.
*/
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useHMR
? {
loader: "style-loader",
/**
* If we refactor the `theme.js` in `matrix-react-sdk` a little bit,
* we could try using `lazyStyleTag` here to add and remove styles on demand,
* that would nicely resolve issues of race conditions for themes,
* at least for development purposes.
*/
options: {
insert: function insertBeforeAt(element) {
const parent = document.querySelector("head");
// We're in iframe
if (!window.MX_DEV_ACTIVE_THEMES) {
parent.appendChild(element);
return;
}
// Properly disable all other instances of themes
element.disabled = true;
element.onload = () => {
element.disabled = true;
};
const theme =
window.MX_DEV_ACTIVE_THEMES[window.MX_insertedThemeStylesCounter];
element.setAttribute("data-mx-theme", theme);
window.MX_insertedThemeStylesCounter++;
parent.appendChild(element);
},
},
}
: MiniCssExtractPlugin.loader,
{
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loader: "css-loader",
options: {
importLoaders: 1,
sourceMap: true,
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},
},
{
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loader: "postcss-loader",
ident: "postcss",
options: {
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"sourceMap": true,
"plugins": () => [
// Note that we use slightly different plugins for PostCSS.
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require("postcss-import")(),
require("postcss-mixins")(),
require("postcss-simple-vars")(),
require("postcss-nested")(),
require("postcss-easings")(),
require("postcss-hexrgba")(),
// It's important that this plugin is last otherwise we end
// up with broken CSS.
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require("postcss-preset-env")({ stage: 3, browsers: "last 2 versions" }),
],
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"parser": "postcss-scss",
"local-plugins": true,
},
},
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],
},
{
// the olm library wants to load its own wasm, rather than have webpack do it.
// We therefore use the `file-loader` to tell webpack to dump the contents to
// a separate file and return the name, and override the default `type` for `.wasm` files
// (which is `webassembly/experimental` under webpack 4) to stop webpack trying to interpret
// the filename as webassembly. (see also https://github.com/webpack/webpack/issues/6725)
test: /olm\.wasm$/,
loader: "file-loader",
type: "javascript/auto",
options: {
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name: "[name].[hash:7].[ext]",
outputPath: ".",
},
},
{
// Fix up the name of the opus-recorder worker (react-sdk dependency).
// We more or less just want it to be clear it's for opus and not something else.
test: /encoderWorker\.min\.js$/,
loader: "file-loader",
type: "javascript/auto",
options: {
// We deliberately override the name so it makes sense in debugging
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name: "opus-encoderWorker.min.[hash:7].[ext]",
outputPath: ".",
},
},
{
// Special case the recorder worklet as it can't end up HMR'd, but the worker-loader
// isn't good enough for us. Note that the worklet-loader is listed as "do not use",
// however it seems to work fine for our purposes.
test: /RecorderWorklet\.ts$/,
type: "javascript/auto",
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use: [
// executed last -> first, for some reason.
{
loader: "worklet-loader",
options: {
// Override name so we know what it is in the output.
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name: "recorder-worklet.[hash:7].js",
},
},
{
// TS -> JS because the worklet-loader won't do this for us.
loader: "babel-loader",
},
],
},
{
// This is from the same place as the encoderWorker above, but only needed
// for Safari support.
test: /decoderWorker\.min\.js$/,
loader: "file-loader",
type: "javascript/auto", // https://github.com/webpack/webpack/issues/6725
options: {
// We deliberately override the name so it makes sense in debugging
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name: "opus-decoderWorker.min.[hash:7].[ext]",
outputPath: ".",
},
},
{
// Same deal as olm.wasm: the decoderWorker wants to load the wasm artifact
// itself.
test: /decoderWorker\.min\.wasm$/,
loader: "file-loader",
type: "javascript/auto",
options: {
// We deliberately don't change the name because the decoderWorker has this
// hardcoded. This is here to avoid the default wasm rule from adding a hash.
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name: "decoderWorker.min.wasm",
outputPath: ".",
},
},
{
// This is from the same place as the encoderWorker above, but only needed
// for Safari support.
test: /waveWorker\.min\.js$/,
loader: "file-loader",
type: "javascript/auto", // https://github.com/webpack/webpack/issues/6725
options: {
// We deliberately override the name so it makes sense in debugging
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name: "wave-encoderWorker.min.[hash:7].[ext]",
outputPath: ".",
},
},
{
// cache-bust languages.json file placed in
// element-web/webapp/i18n during build by copy-res.ts
test: /\.*languages.json$/,
type: "javascript/auto",
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loader: "file-loader",
options: {
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name: "i18n/[name].[hash:7].[ext]",
},
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},
{
test: /\.svg$/,
issuer: /\.(js|ts|jsx|tsx|html)$/,
use: [
{
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loader: "@svgr/webpack",
options: {
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namedExport: "Icon",
svgProps: {
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"role": "presentation",
"aria-hidden": true,
},
// props set on the svg will override defaults
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expandProps: "end",
svgoConfig: {
plugins: {
// generates a viewbox if missing
removeDimensions: true,
},
},
/**
* Forwards the React ref to the root SVG element
* Useful when using things like `asChild` in
* radix-ui
*/
ref: true,
esModule: false,
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name: "[name].[hash:7].[ext]",
outputPath: getAssetOutputPath,
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publicPath: function (url, resourcePath) {
const outputPath = getAssetOutputPath(url, resourcePath);
return toPublicPath(outputPath);
},
},
},
{
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loader: "file-loader",
options: {
esModule: false,
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name: "[name].[hash:7].[ext]",
outputPath: getAssetOutputPath,
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publicPath: function (url, resourcePath) {
const outputPath = getAssetOutputPath(url, resourcePath);
return toPublicPath(outputPath);
},
},
},
],
},
{
test: /\.svg$/,
issuer: /\.(pcss|scss|css)$/,
use: [
{
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loader: "file-loader",
options: {
esModule: false,
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name: "[name].[hash:7].[ext]",
outputPath: getAssetOutputPath,
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publicPath: function (url, resourcePath) {
// CSS image usages end up in the `bundles/[hash]` output
// directory, so we adjust the final path to navigate up
// twice.
const outputPath = getAssetOutputPath(url, resourcePath);
return toPublicPath(path.join("../..", outputPath));
},
},
},
],
},
{
test: /\.(gif|png|ttf|woff|woff2|xml|ico)$/,
// Use a content-based hash in the name so that we can set a long cache
// lifetime for assets while still delivering changes quickly.
oneOf: [
{
// Assets referenced in CSS files
issuer: /\.(pcss|scss|css)$/,
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loader: "file-loader",
options: {
esModule: false,
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name: "[name].[hash:7].[ext]",
outputPath: getAssetOutputPath,
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publicPath: function (url, resourcePath) {
// CSS image usages end up in the `bundles/[hash]` output
// directory, so we adjust the final path to navigate up
// twice.
const outputPath = getAssetOutputPath(url, resourcePath);
return toPublicPath(path.join("../..", outputPath));
},
},
},
{
// Assets referenced in HTML and JS files
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loader: "file-loader",
options: {
esModule: false,
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name: "[name].[hash:7].[ext]",
outputPath: getAssetOutputPath,
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publicPath: function (url, resourcePath) {
const outputPath = getAssetOutputPath(url, resourcePath);
return toPublicPath(outputPath);
},
},
},
],
},
].filter(Boolean),
},
plugins: [
...moduleReplacementPlugins,
// This exports our CSS using the splitChunks and loaders above.
new MiniCssExtractPlugin({
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filename: useHMR ? "bundles/[name].css" : "bundles/[hash]/[name].css",
chunkFilename: useHMR ? "bundles/[name].css" : "bundles/[hash]/[name].css",
ignoreOrder: false, // Enable to remove warnings about conflicting order
}),
// This is the app's main entry point.
new HtmlWebpackPlugin({
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template: "./src/vector/index.html",
// we inject the links ourselves via the template, because
// HtmlWebpackPlugin will screw up our formatting like the names
// of the themes and which chunks we actually care about.
inject: false,
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excludeChunks: ["mobileguide", "usercontent", "jitsi"],
minify: false,
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templateParameters: {
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og_image_url: ogImageUrl,
csp_extra_source: process.env.CSP_EXTRA_SOURCE ?? "",
},
}),
// This is the jitsi widget wrapper (embedded, so isolated stack)
new HtmlWebpackPlugin({
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template: "./src/vector/jitsi/index.html",
filename: "jitsi.html",
minify: false,
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chunks: ["jitsi"],
}),
// This is the mobile guide's entry point (separate for faster mobile loading)
new HtmlWebpackPlugin({
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template: "./src/vector/mobile_guide/index.html",
filename: "mobile_guide/index.html",
minify: false,
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chunks: ["mobileguide"],
}),
// These are the static error pages for when the javascript env is *really unsupported*
new HtmlWebpackPlugin({
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template: "./src/vector/static/unable-to-load.html",
filename: "static/unable-to-load.html",
minify: false,
chunks: [],
}),
new HtmlWebpackPlugin({
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template: "./src/vector/static/incompatible-browser.html",
filename: "static/incompatible-browser.html",
minify: false,
chunks: [],
}),
// This is the usercontent sandbox's entry point (separate for iframing)
new HtmlWebpackPlugin({
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template: "./node_modules/matrix-react-sdk/src/usercontent/index.html",
filename: "usercontent/index.html",
minify: false,
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chunks: ["usercontent"],
}),
new HtmlWebpackInjectPreload({
files: [{ match: /.*Inter.*\.woff2$/ }],
}),
// upload to sentry if sentry env is present
process.env.SENTRY_DSN &&
sentryWebpackPlugin({
release: process.env.VERSION,
sourcemaps: {
paths: "./webapp/bundles/**",
},
errorHandler: (err, invokeErr, compilation) => {
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compilation.warnings.push("Sentry CLI Plugin: " + err.message);
console.log(`::warning title=Sentry error::${err.message}`);
},
}),
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new webpack.EnvironmentPlugin(["VERSION"]),
].filter(Boolean),
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output: {
path: path.join(__dirname, "webapp"),
// The generated JS (and CSS, from the extraction plugin) are put in a
// unique subdirectory for the build. There will only be one such
// 'bundle' directory in the generated tarball; however, hosting
// servers can collect 'bundles' from multiple versions into one
// directory and symlink it into place - this allows users who loaded
// an older version of the application to continue to access webpack
// chunks even after the app is redeployed.
filename: "bundles/[hash]/[name].js",
chunkFilename: "bundles/[hash]/[name].js",
webassemblyModuleFilename: "bundles/[hash]/[modulehash].wasm",
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},
// configuration for the webpack-dev-server
devServer: {
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static: {
// Where to serve static assets from
directory: "./webapp",
},
devMiddleware: {
// Only output errors, warnings, or new compilations.
// This hides the massive list of modules.
stats: "minimal",
},
// Enable Hot Module Replacement without page refresh as a fallback in
// case of build failures
hot: "only",
// Disable host check
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allowedHosts: "all",
},
};
};
/**
* Merge assets found via CSS and imports into a single tree, while also preserving
* directories under e.g. `res` or similar.
*
* @param {string} url The adjusted name of the file, such as `warning.1234567.svg`.
* @param {string} resourcePath The absolute path to the source file with unmodified name.
* @return {string} The returned paths will look like `img/warning.1234567.svg`.
*/
function getAssetOutputPath(url, resourcePath) {
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const isKaTeX = resourcePath.includes("KaTeX");
// `res` is the parent dir for our own assets in various layers
// `dist` is the parent dir for KaTeX assets
const prefix = /^.*[/\\](dist|res)[/\\]/;
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/**
* Only needed for https://github.com/vector-im/element-web/pull/15939
* If keeping this, we are not able to load external assets such as SVG
* images coming from @vector-im/compound-web.
*/
if (isKaTeX && !resourcePath.match(prefix)) {
throw new Error(`Unexpected asset path: ${resourcePath}`);
}
let outputDir = path.dirname(resourcePath).replace(prefix, "");
/**
* Imports from Compound are "absolute", we need to strip out the prefix
* coming before the npm package name.
*
* This logic is scoped to compound packages for now as they are the only
* package that imports external assets. This might need to be made more
* generic in the future
*/
const compoundImportsPrefix = /@vector-im(?:\\|\/)compound-(.*?)(?:\\|\/)/;
const compoundMatch = outputDir.match(compoundImportsPrefix);
if (compoundMatch) {
outputDir = outputDir.substring(compoundMatch.index + compoundMatch[0].length);
}
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if (isKaTeX) {
// Add a clearly named directory segment, rather than leaving the KaTeX
// assets loose in each asset type directory.
outputDir = path.join(outputDir, "KaTeX");
}
return path.join(outputDir, path.basename(url));
}
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/**
* Convert path to public path format, which always uses forward slashes, since it will
* be placed directly into things like CSS files.
*
* @param {string} path Some path to a file.
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* @returns {string} converted path
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*/
function toPublicPath(path) {
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return path.replace(/\\/g, "/");
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}