87 lines
2 KiB
JavaScript
87 lines
2 KiB
JavaScript
/*
|
|
MIT License http://www.opensource.org/licenses/mit-license.php
|
|
Author Tobias Koppers @sokra
|
|
*/
|
|
"use strict";
|
|
|
|
class AggressiveMergingPlugin {
|
|
constructor(options) {
|
|
if (
|
|
(options !== undefined && typeof options !== "object") ||
|
|
Array.isArray(options)
|
|
) {
|
|
throw new Error(
|
|
"Argument should be an options object. To use defaults, pass in nothing.\nFor more info on options, see https://webpack.js.org/plugins/"
|
|
);
|
|
}
|
|
this.options = options || {};
|
|
}
|
|
|
|
apply(compiler) {
|
|
const options = this.options;
|
|
const minSizeReduce = options.minSizeReduce || 1.5;
|
|
|
|
compiler.hooks.thisCompilation.tap(
|
|
"AggressiveMergingPlugin",
|
|
compilation => {
|
|
compilation.hooks.optimizeChunksAdvanced.tap(
|
|
"AggressiveMergingPlugin",
|
|
chunks => {
|
|
let combinations = [];
|
|
chunks.forEach((a, idx) => {
|
|
if (a.canBeInitial()) return;
|
|
for (let i = 0; i < idx; i++) {
|
|
const b = chunks[i];
|
|
if (b.canBeInitial()) continue;
|
|
combinations.push({
|
|
a,
|
|
b,
|
|
improvement: undefined
|
|
});
|
|
}
|
|
});
|
|
|
|
for (const pair of combinations) {
|
|
const a = pair.b.size({
|
|
chunkOverhead: 0
|
|
});
|
|
const b = pair.a.size({
|
|
chunkOverhead: 0
|
|
});
|
|
const ab = pair.b.integratedSize(pair.a, {
|
|
chunkOverhead: 0
|
|
});
|
|
let newSize;
|
|
if (ab === false) {
|
|
pair.improvement = false;
|
|
return;
|
|
} else {
|
|
newSize = ab;
|
|
}
|
|
|
|
pair.improvement = (a + b) / newSize;
|
|
}
|
|
combinations = combinations.filter(pair => {
|
|
return pair.improvement !== false;
|
|
});
|
|
combinations.sort((a, b) => {
|
|
return b.improvement - a.improvement;
|
|
});
|
|
|
|
const pair = combinations[0];
|
|
|
|
if (!pair) return;
|
|
if (pair.improvement < minSizeReduce) return;
|
|
|
|
if (pair.b.integrate(pair.a, "aggressive-merge")) {
|
|
chunks.splice(chunks.indexOf(pair.a), 1);
|
|
return true;
|
|
}
|
|
}
|
|
);
|
|
}
|
|
);
|
|
}
|
|
}
|
|
|
|
module.exports = AggressiveMergingPlugin;
|