source: trip-planner-front/node_modules/webpack/lib/optimize/MinChunkSizePlugin.js

Last change on this file 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_ADVANCED } = require("../OptimizationStages");
9const createSchemaValidation = require("../util/create-schema-validation");
10
11/** @typedef {import("../../declarations/plugins/optimize/MinChunkSizePlugin").MinChunkSizePluginOptions} MinChunkSizePluginOptions */
12/** @typedef {import("../Chunk")} Chunk */
13/** @typedef {import("../Compiler")} Compiler */
14
15const validate = createSchemaValidation(
16 require("../../schemas/plugins/optimize/MinChunkSizePlugin.check.js"),
17 () => require("../../schemas/plugins/optimize/MinChunkSizePlugin.json"),
18 {
19 name: "Min Chunk Size Plugin",
20 baseDataPath: "options"
21 }
22);
23
24class MinChunkSizePlugin {
25 /**
26 * @param {MinChunkSizePluginOptions} options options object
27 */
28 constructor(options) {
29 validate(options);
30 this.options = options;
31 }
32
33 /**
34 * Apply the plugin
35 * @param {Compiler} compiler the compiler instance
36 * @returns {void}
37 */
38 apply(compiler) {
39 const options = this.options;
40 const minChunkSize = options.minChunkSize;
41 compiler.hooks.compilation.tap("MinChunkSizePlugin", compilation => {
42 compilation.hooks.optimizeChunks.tap(
43 {
44 name: "MinChunkSizePlugin",
45 stage: STAGE_ADVANCED
46 },
47 chunks => {
48 const chunkGraph = compilation.chunkGraph;
49 const equalOptions = {
50 chunkOverhead: 1,
51 entryChunkMultiplicator: 1
52 };
53
54 const chunkSizesMap = new Map();
55 /** @type {[Chunk, Chunk][]} */
56 const combinations = [];
57 /** @type {Chunk[]} */
58 const smallChunks = [];
59 const visitedChunks = [];
60 for (const a of chunks) {
61 // check if one of the chunks sizes is smaller than the minChunkSize
62 // and filter pairs that can NOT be integrated!
63 if (chunkGraph.getChunkSize(a, equalOptions) < minChunkSize) {
64 smallChunks.push(a);
65 for (const b of visitedChunks) {
66 if (chunkGraph.canChunksBeIntegrated(b, a))
67 combinations.push([b, a]);
68 }
69 } else {
70 for (const b of smallChunks) {
71 if (chunkGraph.canChunksBeIntegrated(b, a))
72 combinations.push([b, a]);
73 }
74 }
75 chunkSizesMap.set(a, chunkGraph.getChunkSize(a, options));
76 visitedChunks.push(a);
77 }
78
79 const sortedSizeFilteredExtendedPairCombinations = combinations
80 .map(pair => {
81 // extend combination pairs with size and integrated size
82 const a = chunkSizesMap.get(pair[0]);
83 const b = chunkSizesMap.get(pair[1]);
84 const ab = chunkGraph.getIntegratedChunksSize(
85 pair[0],
86 pair[1],
87 options
88 );
89 /** @type {[number, number, Chunk, Chunk]} */
90 const extendedPair = [a + b - ab, ab, pair[0], pair[1]];
91 return extendedPair;
92 })
93 .sort((a, b) => {
94 // sadly javascript does an in place sort here
95 // sort by size
96 const diff = b[0] - a[0];
97 if (diff !== 0) return diff;
98 return a[1] - b[1];
99 });
100
101 if (sortedSizeFilteredExtendedPairCombinations.length === 0) return;
102
103 const pair = sortedSizeFilteredExtendedPairCombinations[0];
104
105 chunkGraph.integrateChunks(pair[2], pair[3]);
106 compilation.chunks.delete(pair[3]);
107 return true;
108 }
109 );
110 });
111 }
112}
113module.exports = MinChunkSizePlugin;
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