mirror of https://github.com/webpack/webpack.git
115 lines
3.4 KiB
JavaScript
115 lines
3.4 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_BASIC } = require("../OptimizationStages");
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const Queue = require("../util/Queue");
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const { intersect } = require("../util/SetHelpers");
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/** @typedef {import("../Compiler")} Compiler */
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class RemoveParentModulesPlugin {
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/**
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* @param {Compiler} compiler the compiler
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* @returns {void}
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*/
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apply(compiler) {
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compiler.hooks.compilation.tap("RemoveParentModulesPlugin", compilation => {
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const handler = (chunks, chunkGroups) => {
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const chunkGraph = compilation.chunkGraph;
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const queue = new Queue();
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const availableModulesMap = new WeakMap();
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for (const chunkGroup of compilation.entrypoints.values()) {
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// initialize available modules for chunks without parents
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availableModulesMap.set(chunkGroup, new Set());
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for (const child of chunkGroup.childrenIterable) {
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queue.enqueue(child);
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}
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}
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while (queue.length > 0) {
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const chunkGroup = queue.dequeue();
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let availableModules = availableModulesMap.get(chunkGroup);
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let changed = false;
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for (const parent of chunkGroup.parentsIterable) {
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const availableModulesInParent = availableModulesMap.get(parent);
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if (availableModulesInParent !== undefined) {
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// If we know the available modules in parent: process these
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if (availableModules === undefined) {
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// if we have not own info yet: create new entry
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availableModules = new Set(availableModulesInParent);
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for (const chunk of parent.chunks) {
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for (const m of chunkGraph.getChunkModulesIterable(chunk)) {
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availableModules.add(m);
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}
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}
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availableModulesMap.set(chunkGroup, availableModules);
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changed = true;
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} else {
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for (const m of availableModules) {
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if (
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!chunkGraph.isModuleInChunkGroup(m, parent) &&
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!availableModulesInParent.has(m)
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) {
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availableModules.delete(m);
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changed = true;
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}
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}
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}
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}
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}
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if (changed) {
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// if something changed: enqueue our children
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for (const child of chunkGroup.childrenIterable) {
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queue.enqueue(child);
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}
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}
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}
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// now we have available modules for every chunk
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for (const chunk of chunks) {
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const availableModulesSets = Array.from(
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chunk.groupsIterable,
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chunkGroup => availableModulesMap.get(chunkGroup)
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);
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if (availableModulesSets.some(s => s === undefined)) continue; // No info about this chunk group
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const availableModules =
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availableModulesSets.length === 1
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? availableModulesSets[0]
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: intersect(availableModulesSets);
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const numberOfModules = chunkGraph.getNumberOfChunkModules(chunk);
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const toRemove = new Set();
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if (numberOfModules < availableModules.size) {
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for (const m of chunkGraph.getChunkModulesIterable(chunk)) {
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if (availableModules.has(m)) {
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toRemove.add(m);
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}
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}
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} else {
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for (const m of availableModules) {
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if (chunkGraph.isModuleInChunk(m, chunk)) {
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toRemove.add(m);
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}
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}
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}
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for (const module of toRemove) {
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chunkGraph.disconnectChunkAndModule(chunk, module);
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}
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}
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};
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compilation.hooks.optimizeChunks.tap(
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{
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name: "RemoveParentModulesPlugin",
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stage: STAGE_BASIC
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},
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handler
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);
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});
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}
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}
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module.exports = RemoveParentModulesPlugin;
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