mirror of https://github.com/webpack/webpack.git
68 lines
2.0 KiB
JavaScript
68 lines
2.0 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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function chunkSizeWithModules(modules) {
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return modules.map(function(m) {
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return m.size();
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}).reduce(function(a, b) {
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return a + b;
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});
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}
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function LimitChunkCountPlugin(options) {
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this.options = options || {};
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}
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module.exports = LimitChunkCountPlugin;
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LimitChunkCountPlugin.prototype.apply = function(compiler) {
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var options = this.options;
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compiler.plugin("compilation", function(compilation) {
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compilation.plugin("optimize-chunks", function(chunks) {
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var maxChunks = options.maxChunks;
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if(!maxChunks) return;
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if(maxChunks < 1) return;
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if(chunks.length <= maxChunks) return;
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var CHUNK_OVERHEAD = options.chunkOverhead || 10000;
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var ENTRY_CHUNK_MULTIPLICATOR = options.entryChunkMultiplicator || 10;
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if(chunks.length > maxChunks) {
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var combinations = [];
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chunks.forEach(function(a, idx) {
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for(var i = 0; i < idx; i++) {
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var b = chunks[i];
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combinations.push([b, a]);
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}
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});
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combinations.forEach(function(pair) {
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var modulesA = pair[0].modules;
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var modulesB = pair[1].modules;
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var mergedModules = modulesA.slice();
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modulesB.forEach(function(m) {
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if(modulesA.indexOf(m) < 0)
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mergedModules.push(m);
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});
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var a = chunkSizeWithModules(modulesA) * (pair[0].entry ? ENTRY_CHUNK_MULTIPLICATOR : 1) + CHUNK_OVERHEAD;
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var b = chunkSizeWithModules(modulesB) * (pair[1].entry ? ENTRY_CHUNK_MULTIPLICATOR : 1) + CHUNK_OVERHEAD;
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var ab = chunkSizeWithModules(mergedModules) * (pair[0].entry || pair[1].entry ? ENTRY_CHUNK_MULTIPLICATOR : 1) + CHUNK_OVERHEAD;
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pair.unshift(a + b - ab, ab);
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});
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combinations.sort(function(a,b) {
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var diff = b[0] - a[0];
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if(diff != 0) return diff;
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return a[1] - b[1];
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});
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var pair = combinations[0];
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pair[2].integrate(pair[3], "limit");
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chunks.splice(chunks.indexOf(pair[3]), 1);
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this.restartApplyPlugins();
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}
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});
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});
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};
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