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Adapt to Webpack 5 #114

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May 23, 2022
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Adapt to Webpack 5 #114

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64 changes: 52 additions & 12 deletions src/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,7 @@ loader.pitch = function(request) {

const cb = this.async();

const filename = loaderUtils.interpolateName(this, `${options.name || '[hash]'}.worker.js`, {
const filename = loaderUtils.interpolateName(this, `${options.name || '[fullhash]'}.worker.js`, {
context: options.context || this.rootContext || this.options.context,
regExp: options.regExp
});
Expand Down Expand Up @@ -89,22 +89,37 @@ loader.pitch = function(request) {

compilationHook(worker.compiler, (compilation, data) => {
if (compilation.cache) {
if (!compilation.cache[subCache]) compilation.cache[subCache] = {};

compilation.cache = compilation.cache[subCache];
let cache;
if (compilation.cache instanceof Map) {
cache = compilation.cache.get(subCache);
if (!cache) {
cache = new Map();
compilation.cache.set(subCache, cache);
}
}
else if (!compilation.cache[subCache]) {
cache = compilation.cache[subCache] = {};
}

compilation.cache = cache;
}
parseHook(data, (parser, options) => {
exportDeclarationHook(parser, expr => {
let decl = expr.declaration || expr,
{ compilation, current } = parser.state,
entry = compilation.entries[0].resource;
let decl = expr.declaration || expr;
let { compilation, current } = parser.state;

let entryModule =
compilation.entries instanceof Map
? compilation.moduleGraph.getModule(
compilation.entries.get('main').dependencies[0]
)
: compilation.entries[0];

// only process entry exports
if (current.resource!==entry) return;
if (current.resource!==entryModule.resource) return;

let key = current.nameForCondition();
let exports = CACHE[key] || (CACHE[key] = {});

if (decl.id) {
exports[decl.id.name] = true;
}
Expand All @@ -116,6 +131,20 @@ loader.pitch = function(request) {
else {
console.warn('[workerize] unknown export declaration: ', expr);
}

// This is for Webpack 5: mark the exports as used so it does not get tree-shaken away on production build
if (compilation.moduleGraph) {
const { getEntryRuntime } = require('webpack/lib/util/runtime');
const { UsageState } = require('webpack');
const runtime = getEntryRuntime(compilation, 'main');
for (const exportName of Object.keys(exports)) {
const exportInfo = compilation.moduleGraph.getExportInfo(entryModule, exportName);
exportInfo.setUsed(UsageState.Used, runtime);
exportInfo.canMangleUse = false;
exportInfo.canMangleProvide = false;
}
compilation.moduleGraph.addExtraReason(entryModule, 'used by workerize-loader');
}
});
});
});
Expand All @@ -124,9 +153,20 @@ loader.pitch = function(request) {
if (err) return cb(err);

if (entries[0]) {
worker.file = entries[0].files[0];

let key = entries[0].entryModule.nameForCondition();
worker.file = Array.from(entries[0].files)[0];
const entryModules =
compilation.chunkGraph &&
compilation.chunkGraph.getChunkEntryModulesIterable
? Array.from(
compilation.chunkGraph.getChunkEntryModulesIterable(entries[0])
)
: null;
const entryModule =
entryModules && entryModules.length > 0
? entryModules[0]
: entries[0].entryModule;

let key = entryModule.nameForCondition();
let contents = compilation.assets[worker.file].source();
let exports = Object.keys(CACHE[key] || {});

Expand Down