2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
class LimitChunkCountPlugin {
constructor(options) {
if(options !== undefined && typeof options !== "object" || Array.isArray(options)) {
throw new Error("Argument should be an options object.\nFor more info on options, see https://webpack.js.org/plugins/");
}
this.options = options || {};
}
apply(compiler) {
const options = this.options;
compiler.plugin("compilation", (compilation) => {
compilation.plugin("optimize-chunks-advanced", (chunks) => {
const maxChunks = options.maxChunks;
if(!maxChunks) return;
if(maxChunks < 1) return;
if(chunks.length <= maxChunks) return;
if(chunks.length > maxChunks) {
const sortedExtendedPairCombinations = chunks.reduce((combinations, a, idx) => {
// create combination pairs
for(let i = 0; i < idx; i++) {
const b = chunks[i];
combinations.push([b, a]);
}
return combinations;
}, []).map((pair) => {
// extend combination pairs with size and integrated size
const a = pair[0].size(options);
const b = pair[1].size(options);
const ab = pair[0].integratedSize(pair[1], options);
return [a + b - ab, ab, pair[0], pair[1], a, b];
}).filter((extendedPair) => {
// filter pairs that do not have an integratedSize
// meaning they can NOT be integrated!
return extendedPair[1] !== false;
}).sort((a, b) => { // sadly javascript does an inplace sort here
// sort them by size
const diff = b[0] - a[0];
if(diff !== 0) return diff;
return a[1] - b[1];
});
const pair = sortedExtendedPairCombinations[0];
if(pair && pair[2].integrate(pair[3], "limit")) {
chunks.splice(chunks.indexOf(pair[3]), 1);
return true;
}
}
});
});
}
}
module.exports = LimitChunkCountPlugin;
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