mirror of https://github.com/webpack/webpack.git
103 lines
3.3 KiB
JavaScript
103 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 Queue = require("../util/Queue");
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const intersect = require("../util/SetHelpers").intersect;
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const getParentChunksWithModule = (currentChunk, module) => {
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const chunks = [];
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const stack = new Set(currentChunk.parentsIterable);
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for(const chunk of stack) {
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if(chunk.containsModule(module)) {
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chunks.push(chunk);
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} else {
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for(const parent of chunk.parentsIterable) {
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stack.add(parent);
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}
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}
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}
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return chunks;
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};
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class RemoveParentModulesPlugin {
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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 queue = new Queue();
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const availableModulesMap = new Map();
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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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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 chunk.modulesIterable)
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availableModules.add(m);
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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(!parent.containsModule(m) && !availableModulesInParent.has(m)) {
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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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// 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(chunk.groupsIterable, chunkGroup => availableModulesMap.get(chunkGroup));
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if(availableModulesSets.some(s => s === undefined)) continue; // No info about this chunk group
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const availableModules = intersect(availableModulesSets);
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const numberOfModules = chunk.getNumberOfModules();
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const toRemove = new Set();
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if(numberOfModules < availableModules.size) {
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for(const m of chunk.modulesIterable)
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if(availableModules.has(m))
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toRemove.add(m);
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} else {
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for(const m of availableModules)
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if(chunk.containsModule(m))
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toRemove.add(m);
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}
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for(const module of toRemove) {
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module.rewriteChunkInReasons(chunk, getParentChunksWithModule(chunk, module));
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chunk.removeModule(module);
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}
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}
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};
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compilation.hooks.optimizeChunksBasic.tap("RemoveParentModulesPlugin", handler);
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compilation.hooks.optimizeExtractedChunksBasic.tap("RemoveParentModulesPlugin", handler);
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});
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}
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}
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module.exports = RemoveParentModulesPlugin;
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