source: trip-planner-front/node_modules/webpack/lib/optimize/RemoveParentModulesPlugin.js@ ceaed42

Last change on this file since ceaed42 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

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1/*
2 MIT License http://www.opensource.org/licenses/mit-license.php
3 Author Tobias Koppers @sokra
4*/
5
6"use strict";
7
8const { STAGE_BASIC } = require("../OptimizationStages");
9const Queue = require("../util/Queue");
10const { intersect } = require("../util/SetHelpers");
11
12/** @typedef {import("../Compiler")} Compiler */
13
14class RemoveParentModulesPlugin {
15 /**
16 * @param {Compiler} compiler the compiler
17 * @returns {void}
18 */
19 apply(compiler) {
20 compiler.hooks.compilation.tap("RemoveParentModulesPlugin", compilation => {
21 const handler = (chunks, chunkGroups) => {
22 const chunkGraph = compilation.chunkGraph;
23 const queue = new Queue();
24 const availableModulesMap = new WeakMap();
25
26 for (const chunkGroup of compilation.entrypoints.values()) {
27 // initialize available modules for chunks without parents
28 availableModulesMap.set(chunkGroup, new Set());
29 for (const child of chunkGroup.childrenIterable) {
30 queue.enqueue(child);
31 }
32 }
33 for (const chunkGroup of compilation.asyncEntrypoints) {
34 // initialize available modules for chunks without parents
35 availableModulesMap.set(chunkGroup, new Set());
36 for (const child of chunkGroup.childrenIterable) {
37 queue.enqueue(child);
38 }
39 }
40
41 while (queue.length > 0) {
42 const chunkGroup = queue.dequeue();
43 let availableModules = availableModulesMap.get(chunkGroup);
44 let changed = false;
45 for (const parent of chunkGroup.parentsIterable) {
46 const availableModulesInParent = availableModulesMap.get(parent);
47 if (availableModulesInParent !== undefined) {
48 // If we know the available modules in parent: process these
49 if (availableModules === undefined) {
50 // if we have not own info yet: create new entry
51 availableModules = new Set(availableModulesInParent);
52 for (const chunk of parent.chunks) {
53 for (const m of chunkGraph.getChunkModulesIterable(chunk)) {
54 availableModules.add(m);
55 }
56 }
57 availableModulesMap.set(chunkGroup, availableModules);
58 changed = true;
59 } else {
60 for (const m of availableModules) {
61 if (
62 !chunkGraph.isModuleInChunkGroup(m, parent) &&
63 !availableModulesInParent.has(m)
64 ) {
65 availableModules.delete(m);
66 changed = true;
67 }
68 }
69 }
70 }
71 }
72 if (changed) {
73 // if something changed: enqueue our children
74 for (const child of chunkGroup.childrenIterable) {
75 queue.enqueue(child);
76 }
77 }
78 }
79
80 // now we have available modules for every chunk
81 for (const chunk of chunks) {
82 const availableModulesSets = Array.from(
83 chunk.groupsIterable,
84 chunkGroup => availableModulesMap.get(chunkGroup)
85 );
86 if (availableModulesSets.some(s => s === undefined)) continue; // No info about this chunk group
87 const availableModules =
88 availableModulesSets.length === 1
89 ? availableModulesSets[0]
90 : intersect(availableModulesSets);
91 const numberOfModules = chunkGraph.getNumberOfChunkModules(chunk);
92 const toRemove = new Set();
93 if (numberOfModules < availableModules.size) {
94 for (const m of chunkGraph.getChunkModulesIterable(chunk)) {
95 if (availableModules.has(m)) {
96 toRemove.add(m);
97 }
98 }
99 } else {
100 for (const m of availableModules) {
101 if (chunkGraph.isModuleInChunk(m, chunk)) {
102 toRemove.add(m);
103 }
104 }
105 }
106 for (const module of toRemove) {
107 chunkGraph.disconnectChunkAndModule(chunk, module);
108 }
109 }
110 };
111 compilation.hooks.optimizeChunks.tap(
112 {
113 name: "RemoveParentModulesPlugin",
114 stage: STAGE_BASIC
115 },
116 handler
117 );
118 });
119 }
120}
121module.exports = RemoveParentModulesPlugin;
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