webpack/lib/optimize/RemoveParentModulesPlugin.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jade, coffee, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
function hasModule(chunk, module, checkedChunks) {
	if(chunk.modules.indexOf(module) >= 0) return [chunk];
	if(chunk.entry) return false;
	return allHaveModule(chunk.parents.filter(function(c) {
		return checkedChunks.indexOf(c) < 0;
	}), module, checkedChunks);
}

function allHaveModule(someChunks, module, checkedChunks) {
	if(!checkedChunks) checkedChunks = [];
	var chunks = [];
	for(var i = 0; i < someChunks.length; i++) {
		checkedChunks.push(someChunks[i]);
		var subChunks = hasModule(someChunks[i], module, checkedChunks);
		if(!subChunks) return false;
		addToSet(chunks, subChunks);
	}
	return chunks;
}

function addToSet(set, items) {
	items.forEach(function(item) {
		if(set.indexOf(item) < 0)
			set.push(item);
	});
}

function RemoveParentModulesPlugin() {
}
module.exports = RemoveParentModulesPlugin;

RemoveParentModulesPlugin.prototype.apply = function(compiler) {
	compiler.plugin("compilation", function(compilation) {
		compilation.plugin("optimize-chunks", function(chunks) {
			chunks.forEach(function(chunk) {
				chunk.modules.slice().forEach(function(module) {
					if(chunk.entry) return;
					var parentChunksWithModule = allHaveModule(chunk.parents, module);
					if(parentChunksWithModule) {
						module.rewriteChunkInReasons(chunk, parentChunksWithModule);
						chunk.removeModule(module);
					}
				});
			});
		});
	});
};