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CommonsChunkPlugin.js
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178 lines (175 loc) · 5.72 KB
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
var nextIdent = 0;
function CommonsChunkPlugin(options, filenameTemplate, selectedChunks, minChunks) {
if(options && typeof options === "object" && !Array.isArray(options)) {
this.chunkNames = options.name || options.names;
this.filenameTemplate = options.filename;
this.minChunks = options.minChunks;
this.selectedChunks = options.chunks;
if(options.children) this.selectedChunks = false;
this.async = options.async;
this.minSize = options.minSize;
} else {
var chunkNames = options;
if(typeof filenameTemplate !== "string" && filenameTemplate !== null) {
minChunks = selectedChunks;
selectedChunks = filenameTemplate;
filenameTemplate = chunkNames;
}
if(!Array.isArray(selectedChunks) && typeof selectedChunks !== "boolean" && selectedChunks !== null) {
minChunks = selectedChunks;
selectedChunks = undefined;
}
this.chunkNames = chunkNames;
this.filenameTemplate = filenameTemplate;
this.minChunks = minChunks;
this.selectedChunks = selectedChunks;
}
this.ident = __filename + (nextIdent++);
}
module.exports = CommonsChunkPlugin;
CommonsChunkPlugin.prototype.apply = function(compiler) {
var chunkNames = this.chunkNames;
var filenameTemplate = this.filenameTemplate;
var minChunks = this.minChunks;
var selectedChunks = this.selectedChunks;
var async = this.async;
var minSize = this.minSize;
var ident = this.ident;
compiler.plugin("this-compilation", function(compilation) {
compilation.plugin(["optimize-chunks", "optimize-extracted-chunks"], function(chunks) {
// only optimize once
if(compilation[ident]) return;
compilation[ident] = true;
var commonChunks;
if(!chunkNames && (selectedChunks === false || async)) {
commonChunks = chunks;
} else if(Array.isArray(chunkNames) || typeof chunkNames === "string") {
commonChunks = [].concat(chunkNames).map(function(chunkName) {
var chunk = chunks.filter(function(chunk) {
return chunk.name === chunkName;
})[0];
if(!chunk) {
chunk = this.addChunk(chunkName);
chunk.initial = chunk.entry = true;
}
return chunk;
}, this);
} else {
throw new Error("Invalid chunkNames argument");
}
commonChunks.forEach(function processCommonChunk(commonChunk, idx) {
var commonModulesCount = [];
var commonModules = [];
var usedChunks;
if(Array.isArray(selectedChunks)) {
usedChunks = chunks.filter(function(chunk) {
if(chunk === commonChunk) return false;
return selectedChunks.indexOf(chunk.name) >= 0;
});
} else if(selectedChunks === false || async) {
usedChunks = (commonChunk.chunks || []).filter(function(chunk) {
// we can only move modules from this chunk if the "commonChunk" is the only parent
return async || chunk.parents.length === 1;
});
} else {
if(!commonChunk.entry) {
compilation.errors.push(new Error("CommonsChunkPlugin: While running in normal mode it's not allowed to use a non-entry chunk (" + commonChunk.name + ")"));
return;
}
usedChunks = chunks.filter(function(chunk) {
var found = commonChunks.indexOf(chunk);
if(found >= idx) return false;
return chunk.entry;
});
}
if(async) {
var asyncChunk = this.addChunk(typeof async === "string" ? async : undefined);
asyncChunk.chunkReason = "async commons chunk";
asyncChunk.extraAsync = true;
asyncChunk.addParent(commonChunk);
commonChunk.addChunk(asyncChunk);
commonChunk = asyncChunk;
}
usedChunks.forEach(function(chunk) {
chunk.modules.forEach(function(module) {
var idx = commonModules.indexOf(module);
if(idx < 0) {
commonModules.push(module);
commonModulesCount.push(1);
} else {
commonModulesCount[idx]++;
}
});
});
var reallyUsedChunks = [];
var reallyUsedModules = [];
commonModulesCount.forEach(function(count, idx) {
var module = commonModules[idx];
if(typeof minChunks === "function") {
if(!minChunks(module, count))
return;
} else if(count < (minChunks || Math.max(2, usedChunks.length))) {
return;
}
reallyUsedModules.push(module);
});
if(minSize) {
var size = reallyUsedModules.reduce(function(a, b) {
return a + b.size();
}, 0);
if(size < minSize)
return;
}
reallyUsedModules.forEach(function(module) {
usedChunks.forEach(function(chunk) {
if(module.removeChunk(chunk)) {
if(reallyUsedChunks.indexOf(chunk) < 0)
reallyUsedChunks.push(chunk);
}
});
commonChunk.addModule(module);
module.addChunk(commonChunk);
});
if(async) {
reallyUsedChunks.forEach(function(chunk) {
if(chunk.initial || chunk.entry)
return;
chunk.blocks.forEach(function(block) {
block.chunks.unshift(commonChunk);
commonChunk.addBlock(block);
});
});
asyncChunk.origins = reallyUsedChunks.map(function(chunk) {
return chunk.origins.map(function(origin) {
var newOrigin = Object.create(origin);
newOrigin.reasons = (origin.reasons || []).slice();
newOrigin.reasons.push("async commons");
return newOrigin;
});
}).reduce(function(arr, a) {
arr.push.apply(arr, a);
return arr;
}, []);
} else {
usedChunks.forEach(function(chunk) {
chunk.parents = [commonChunk];
commonChunk.chunks.push(chunk);
if(chunk.initial)
commonChunk.initial = true;
if(chunk.entry) {
commonChunk.entry = true;
chunk.entry = false;
}
});
}
if(filenameTemplate)
commonChunk.filenameTemplate = filenameTemplate;
}, this);
this.restartApplyPlugins();
});
});
};