mirror of https://github.com/webpack/webpack.git
122 lines
3.3 KiB
JavaScript
122 lines
3.3 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const { STAGE_DEFAULT } = require("./OptimizationStages");
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const Queue = require("./util/Queue");
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/** @typedef {import("./Compiler")} Compiler */
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/** @typedef {import("./DependenciesBlock")} DependenciesBlock */
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/** @typedef {import("./Dependency")} Dependency */
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/** @typedef {import("./Module")} Module */
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class FlagDependencyUsagePlugin {
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/**
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* @param {Compiler} compiler the compiler instance
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* @returns {void}
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*/
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apply(compiler) {
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compiler.hooks.compilation.tap("FlagDependencyUsagePlugin", compilation => {
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const moduleGraph = compilation.moduleGraph;
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compilation.hooks.optimizeDependencies.tap(
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/** @type {TODO} */ ({
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name: "FlagDependencyUsagePlugin",
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stage: STAGE_DEFAULT
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}),
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modules => {
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/**
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*
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* @param {Module} module module to process
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* @param {boolean | string[]} usedExports list of used exports
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* @returns {void}
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*/
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const processModule = (module, usedExports) => {
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const exportsInfo = moduleGraph.getExportsInfo(module);
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let changed = false;
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if (usedExports === true) {
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changed = exportsInfo.setUsedInUnknownWay();
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} else if (usedExports) {
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for (const exportName of usedExports) {
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if (
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exportName === "default" &&
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module.buildMeta.exportsType === "named"
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) {
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if (exportsInfo.setUsedAsNamedExportType()) {
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changed = true;
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}
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} else {
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const exportInfo = exportsInfo.getExportInfo(exportName);
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if (exportInfo.used !== true) {
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exportInfo.used = true;
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changed = true;
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}
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}
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}
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} else {
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// for a module without side effects we stop tracking usage here when no export is used
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// This module won't be evaluated in this case
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if (module.factoryMeta.sideEffectFree) return;
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changed = exportsInfo.setUsedForSideEffectsOnly();
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}
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if (changed) {
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queue.enqueue(module);
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}
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};
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/**
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* @param {DependenciesBlock} depBlock the dependencies block
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* @returns {void}
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*/
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const processDependenciesBlock = depBlock => {
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for (const dep of depBlock.dependencies) {
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processDependency(dep);
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}
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for (const block of depBlock.blocks) {
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queue.enqueue(block);
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}
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};
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/**
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* @param {Dependency} dep the dependency
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* @returns {void}
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*/
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const processDependency = dep => {
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const reference = compilation.getDependencyReference(dep);
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if (!reference) return;
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const referenceModule = reference.module;
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const importedNames = reference.importedNames;
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processModule(referenceModule, importedNames);
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};
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for (const module of modules) {
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moduleGraph.getExportsInfo(module).setHasUseInfo();
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}
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/** @type {Queue<DependenciesBlock>} */
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const queue = new Queue();
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for (const deps of compilation.entryDependencies.values()) {
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for (const dep of deps) {
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const module = moduleGraph.getModule(dep);
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if (module) {
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processModule(module, true);
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}
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}
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}
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while (queue.length) {
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const depBlock = queue.dequeue();
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processDependenciesBlock(depBlock);
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}
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}
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);
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});
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}
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}
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module.exports = FlagDependencyUsagePlugin;
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