mirror of https://github.com/webpack/webpack.git
249 lines
8.0 KiB
JavaScript
249 lines
8.0 KiB
JavaScript
/*
|
|
MIT License http://www.opensource.org/licenses/mit-license.php
|
|
Author Tobias Koppers @sokra
|
|
*/
|
|
|
|
"use strict";
|
|
|
|
const validateOptions = require("schema-utils");
|
|
const schema = require("../../schemas/plugins/optimize/LimitChunkCountPlugin.json");
|
|
const { STAGE_ADVANCED } = require("../OptimizationStages");
|
|
const LazyBucketSortedSet = require("../util/LazyBucketSortedSet");
|
|
const { compareChunks } = require("../util/comparators");
|
|
|
|
/** @typedef {import("../Chunk")} Chunk */
|
|
/** @typedef {import("../Compiler")} Compiler */
|
|
|
|
/** @typedef {import("../../declarations/plugins/optimize/LimitChunkCountPlugin").LimitChunkCountPluginOptions} LimitChunkCountPluginOptions */
|
|
|
|
/**
|
|
* @typedef {Object} ChunkCombination
|
|
* @property {boolean} deleted this is set to true when combination was removed
|
|
* @property {number} sizeDiff
|
|
* @property {number} integratedSize
|
|
* @property {Chunk} a
|
|
* @property {Chunk} b
|
|
* @property {number} aIdx
|
|
* @property {number} bIdx
|
|
* @property {number} aSize
|
|
* @property {number} bSize
|
|
*/
|
|
|
|
const addToSetMap = (map, key, value) => {
|
|
const set = map.get(key);
|
|
if (set === undefined) {
|
|
map.set(key, new Set([value]));
|
|
} else {
|
|
set.add(value);
|
|
}
|
|
};
|
|
|
|
class LimitChunkCountPlugin {
|
|
/**
|
|
* @param {LimitChunkCountPluginOptions=} options options object
|
|
*/
|
|
constructor(options) {
|
|
validateOptions(schema, options, {
|
|
name: "Limit Chunk Count Plugin",
|
|
baseDataPath: "options"
|
|
});
|
|
this.options = options;
|
|
}
|
|
|
|
/**
|
|
* @param {Compiler} compiler the webpack compiler
|
|
* @returns {void}
|
|
*/
|
|
apply(compiler) {
|
|
const options = this.options;
|
|
compiler.hooks.compilation.tap("LimitChunkCountPlugin", compilation => {
|
|
compilation.hooks.optimizeChunks.tap(
|
|
{
|
|
name: "LimitChunkCountPlugin",
|
|
stage: STAGE_ADVANCED
|
|
},
|
|
chunks => {
|
|
const chunkGraph = compilation.chunkGraph;
|
|
const maxChunks = options.maxChunks;
|
|
if (!maxChunks) return;
|
|
if (maxChunks < 1) return;
|
|
if (compilation.chunks.size <= maxChunks) return;
|
|
|
|
let remainingChunksToMerge = compilation.chunks.size - maxChunks;
|
|
|
|
// order chunks in a deterministic way
|
|
const compareChunksWithGraph = compareChunks(chunkGraph);
|
|
const orderedChunks = Array.from(chunks).sort(compareChunksWithGraph);
|
|
|
|
// create a lazy sorted data structure to keep all combinations
|
|
// this is large. Size = chunks * (chunks - 1) / 2
|
|
// It uses a multi layer bucket sort plus normal sort in the last layer
|
|
// It's also lazy so only accessed buckets are sorted
|
|
const combinations = new LazyBucketSortedSet(
|
|
// Layer 1: ordered by largest size benefit
|
|
c => c.sizeDiff,
|
|
(a, b) => b - a,
|
|
// Layer 2: ordered by smallest combined size
|
|
c => c.integratedSize,
|
|
(a, b) => a - b,
|
|
// Layer 3: ordered by position difference in orderedChunk (-> to be deterministic)
|
|
c => c.bIdx - c.aIdx,
|
|
(a, b) => a - b,
|
|
// Layer 4: ordered by position in orderedChunk (-> to be deterministic)
|
|
(a, b) => a.bIdx - b.bIdx
|
|
);
|
|
|
|
// we keep a mappng from chunk to all combinations
|
|
// but this mapping is not kept up-to-date with deletions
|
|
// so `deleted` flag need to be considered when iterating this
|
|
/** @type {Map<Chunk, Set<ChunkCombination>>} */
|
|
const combinationsByChunk = new Map();
|
|
|
|
orderedChunks.forEach((b, bIdx) => {
|
|
// create combination pairs with size and integrated size
|
|
for (let aIdx = 0; aIdx < bIdx; aIdx++) {
|
|
const a = orderedChunks[aIdx];
|
|
// filter pairs that can not be integrated!
|
|
if (!chunkGraph.canChunksBeIntegrated(a, b)) continue;
|
|
|
|
const integratedSize = chunkGraph.getIntegratedChunksSize(
|
|
a,
|
|
b,
|
|
options
|
|
);
|
|
|
|
const aSize = chunkGraph.getChunkSize(a, options);
|
|
const bSize = chunkGraph.getChunkSize(b, options);
|
|
const c = {
|
|
deleted: false,
|
|
sizeDiff: aSize + bSize - integratedSize,
|
|
integratedSize,
|
|
a,
|
|
b,
|
|
aIdx,
|
|
bIdx,
|
|
aSize,
|
|
bSize
|
|
};
|
|
combinations.add(c);
|
|
addToSetMap(combinationsByChunk, a, c);
|
|
addToSetMap(combinationsByChunk, b, c);
|
|
}
|
|
return combinations;
|
|
});
|
|
|
|
// list of modified chunks during this run
|
|
// combinations affected by this change are skipped to allow
|
|
// futher optimizations
|
|
/** @type {Set<Chunk>} */
|
|
const modifiedChunks = new Set();
|
|
|
|
let changed = false;
|
|
// eslint-disable-next-line no-constant-condition
|
|
loop: while (true) {
|
|
const combination = combinations.popFirst();
|
|
if (combination === undefined) break;
|
|
|
|
combination.deleted = true;
|
|
const { a, b, integratedSize } = combination;
|
|
|
|
// skip over pair when
|
|
// one of the already merged chunks is a parent of one of the chunks
|
|
if (modifiedChunks.size > 0) {
|
|
const queue = new Set(a.groupsIterable);
|
|
for (const group of b.groupsIterable) {
|
|
queue.add(group);
|
|
}
|
|
for (const group of queue) {
|
|
for (const mChunk of modifiedChunks) {
|
|
if (mChunk !== a && mChunk !== b && mChunk.isInGroup(group)) {
|
|
// This is a potential pair which needs recalculation
|
|
// We can't do that now, but it merge before following pairs
|
|
// so we leave space for it, and consider chunks as modified
|
|
// just for the worse case
|
|
remainingChunksToMerge--;
|
|
if (remainingChunksToMerge <= 0) break loop;
|
|
modifiedChunks.add(a);
|
|
modifiedChunks.add(b);
|
|
continue loop;
|
|
}
|
|
}
|
|
for (const parent of group.parentsIterable) {
|
|
queue.add(parent);
|
|
}
|
|
}
|
|
}
|
|
|
|
// merge the chunks
|
|
if (a.integrate(b, "limit")) {
|
|
compilation.chunks.delete(b);
|
|
|
|
// flag chunk a as modified as further optimization are possible for all children here
|
|
modifiedChunks.add(a);
|
|
|
|
changed = true;
|
|
remainingChunksToMerge--;
|
|
if (remainingChunksToMerge <= 0) break;
|
|
|
|
// Update all affected combinations
|
|
// delete all combination with the removed chunk
|
|
// we will use combinations with the kept chunk instead
|
|
for (const combination of combinationsByChunk.get(a)) {
|
|
if (combination.deleted) continue;
|
|
combination.deleted = true;
|
|
combinations.delete(combination);
|
|
}
|
|
|
|
// Update combinations with the kept chunk with new sizes
|
|
for (const combination of combinationsByChunk.get(b)) {
|
|
if (combination.deleted) continue;
|
|
if (combination.a === b) {
|
|
if (!chunkGraph.canChunksBeIntegrated(a, combination.b)) {
|
|
combination.deleted = true;
|
|
combinations.delete(combination);
|
|
continue;
|
|
}
|
|
// Update size
|
|
const newIntegratedSize = a.integratedSize(
|
|
combination.b,
|
|
options
|
|
);
|
|
const finishUpdate = combinations.startUpdate(combination);
|
|
combination.a = a;
|
|
combination.integratedSize = newIntegratedSize;
|
|
combination.aSize = integratedSize;
|
|
combination.sizeDiff =
|
|
combination.bSize + integratedSize - newIntegratedSize;
|
|
finishUpdate();
|
|
} else if (combination.b === b) {
|
|
if (!chunkGraph.canChunksBeIntegrated(combination.a, a)) {
|
|
combination.deleted = true;
|
|
combinations.delete(combination);
|
|
continue;
|
|
}
|
|
// Update size
|
|
const newIntegratedSize = combination.a.integratedSize(
|
|
a,
|
|
options
|
|
);
|
|
const finishUpdate = combinations.startUpdate(combination);
|
|
combination.b = a;
|
|
combination.integratedSize = newIntegratedSize;
|
|
combination.bSize = integratedSize;
|
|
combination.sizeDiff =
|
|
integratedSize + combination.aSize - newIntegratedSize;
|
|
finishUpdate();
|
|
}
|
|
}
|
|
combinationsByChunk.set(a, combinationsByChunk.get(b));
|
|
combinationsByChunk.delete(b);
|
|
}
|
|
}
|
|
if (changed) return true;
|
|
}
|
|
);
|
|
});
|
|
}
|
|
}
|
|
module.exports = LimitChunkCountPlugin;
|