AggressiveSplittingPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
let path = require("path");
function makeRelative(context) {
return function(module) {
let identifier = module.identifier();
return identifier.split("|").map((str) => {
return str.split("!").map((str) => {
return path.relative(context, str);
}).join("!");
}).join("|");
};
}
function toIndexOf(list) {
return function(item) {
return list.indexOf(item);
};
}
function toChunkModuleIndices(modules) {
return function(idx) {
return modules[idx];
};
}
function moveModuleBetween(oldChunk, newChunk) {
return function(module) {
oldChunk.moveModule(module, newChunk);
};
}
function isNotAEntryModule(entryModule) {
return function(module) {
return entryModule !== module;
};
}
function copyWithReason(obj) {
let newObj = {};
Object.keys(obj).forEach((key) => {
newObj[key] = obj[key];
});
if(!newObj.reasons || newObj.reasons.indexOf("aggressive-splitted") < 0)
newObj.reasons = (newObj.reasons || []).concat("aggressive-splitted");
return newObj;
}
class AggressiveSplittingPlugin {
constructor(options) {
this.options = options || {};
if(typeof this.options.minSize !== "number") this.options.minSize = 30 * 1024;
if(typeof this.options.maxSize !== "number") this.options.maxSize = 50 * 1024;
if(typeof this.options.chunkOverhead !== "number") this.options.chunkOverhead = 0;
if(typeof this.options.entryChunkMultiplicator !== "number") this.options.entryChunkMultiplicator = 1;
}
apply(compiler) {
compiler.plugin("compilation", (compilation) => {
compilation.plugin("optimize-chunks-advanced", (chunks) => {
let i, chunk, newChunk;
const savedSplits = compilation.records && compilation.records.aggressiveSplits || [];
let usedSplits = savedSplits;
if(compilation._aggressiveSplittingSplits)
usedSplits = usedSplits.concat(compilation._aggressiveSplittingSplits);
const minSize = this.options.minSize;
const maxSize = this.options.maxSize;
// 1. try to restore to recorded splitting
for(let j = 0; j < usedSplits.length; j++) {
const splitData = usedSplits[j];
for(i = 0; i < chunks.length; i++) {
chunk = chunks[i];
const chunkModuleNames = chunk.modules.map(makeRelative(compiler.context));
if(chunkModuleNames.length < splitData.modules)
continue;
const moduleIndicies = splitData.modules.map(toIndexOf(chunkModuleNames));
const hasAllModules = moduleIndicies.every((idx) => {
return idx >= 0;
});
if(hasAllModules) {
if(chunkModuleNames.length > splitData.modules.length) {
const selectedModules = moduleIndicies.map(toChunkModuleIndices(chunk.modules));
newChunk = compilation.addChunk();
selectedModules.forEach(moveModuleBetween(chunk, newChunk));
chunk.split(newChunk);
chunk.name = null;
newChunk._fromAggressiveSplitting = true;
if(j < savedSplits.length)
newChunk._fromAggressiveSplittingIndex = j;
if(typeof splitData.id === "number") newChunk.id = splitData.id;
newChunk.origins = chunk.origins.map(copyWithReason);
chunk.origins = chunk.origins.map(copyWithReason);
return true;
} else {
if(j < savedSplits.length)
chunk._fromAggressiveSplittingIndex = j;
chunk.name = null;
if(typeof splitData.id === "number") chunk.id = splitData.id;
}
}
}
}
// 2. for any other chunk which isn't splitted yet, split it
for(i = 0; i < chunks.length; i++) {
chunk = chunks[i];
const size = chunk.size(this.options);
if(size > maxSize && chunk.modules.length > 1) {
newChunk = compilation.addChunk();
const modules = chunk.modules
.filter(isNotAEntryModule(chunk.entryModule))
.sort((a, b) => {
a = a.identifier();
b = b.identifier();
if(a > b) return 1;
if(a < b) return -1;
return 0;
});
for(let k = 0; k < modules.length; k++) {
chunk.moveModule(modules[k], newChunk);
const newSize = newChunk.size(this.options);
const chunkSize = chunk.size(this.options);
// break early if it's fine
if(chunkSize < maxSize && newSize < maxSize && newSize >= minSize && chunkSize >= minSize)
break;
if(newSize > maxSize && k === 0) {
// break if there is a single module which is bigger than maxSize
break;
}
if(newSize > maxSize || chunkSize < minSize) {
// move it back
newChunk.moveModule(modules[k], chunk);
// check if it's fine now
if(newSize < maxSize && newSize >= minSize && chunkSize >= minSize)
break;
}
}
if(newChunk.modules.length > 0) {
chunk.split(newChunk);
chunk.name = null;
newChunk.origins = chunk.origins.map(copyWithReason);
chunk.origins = chunk.origins.map(copyWithReason);
compilation._aggressiveSplittingSplits = (compilation._aggressiveSplittingSplits || []).concat({
modules: newChunk.modules.map(makeRelative(compiler.context))
});
return true;
} else {
chunks.splice(chunks.indexOf(newChunk), 1);
}
}
}
});
compilation.plugin("record-hash", (records) => {
// 3. save to made splittings to records
const minSize = this.options.minSize;
if(!records.aggressiveSplits) records.aggressiveSplits = [];
compilation.chunks.forEach((chunk) => {
if(chunk.hasEntryModule()) return;
const size = chunk.size(this.options);
const incorrectSize = size < minSize;
const modules = chunk.modules.map(makeRelative(compiler.context));
if(typeof chunk._fromAggressiveSplittingIndex === "undefined") {
if(incorrectSize) return;
chunk.recorded = true;
records.aggressiveSplits.push({
modules: modules,
hash: chunk.hash,
id: chunk.id
});
} else {
let splitData = records.aggressiveSplits[chunk._fromAggressiveSplittingIndex];
if(splitData.hash !== chunk.hash || incorrectSize) {
if(chunk._fromAggressiveSplitting) {
chunk._aggressiveSplittingInvalid = true;
splitData.invalid = true;
} else {
splitData.hash = chunk.hash;
}
}
}
});
records.aggressiveSplits = records.aggressiveSplits.filter((splitData) => {
return !splitData.invalid;
});
});
compilation.plugin("need-additional-seal", (callback) => {
const invalid = compilation.chunks.some((chunk) => {
return chunk._aggressiveSplittingInvalid;
});
if(invalid)
return true;
});
});
}
}
module.exports = AggressiveSplittingPlugin;