/*
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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");
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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 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 chunk.modulesIterable) {
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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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!parent.containsModule(m) &&
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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 = 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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}
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}
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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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}
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}
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for (const module of toRemove) {
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module.rewriteChunkInReasons(
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chunk,
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getParentChunksWithModule(chunk, module)
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);
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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(
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"RemoveParentModulesPlugin",
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handler
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);
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compilation.hooks.optimizeExtractedChunksBasic.tap(
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"RemoveParentModulesPlugin",
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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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