chushihua

node_modules/webpack/lib/optimize/RemoveParentModulesPlugin.js

@@ -0,0 +1,65 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+function hasModule(chunk, module, checkedChunks) {
+	if(chunk.containsModule(module)) return [chunk];
+	if(chunk.parents.length === 0) return false;
+	return allHaveModule(chunk.parents.filter((c) => {
+		return !checkedChunks.has(c);
+	}), module, checkedChunks);
+}
+
+function allHaveModule(someChunks, module, checkedChunks) {
+	if(!checkedChunks) checkedChunks = new Set();
+	var chunks = new Set();
+	for(var i = 0; i < someChunks.length; i++) {
+		checkedChunks.add(someChunks[i]);
+		var subChunks = hasModule(someChunks[i], module, checkedChunks);
+		if(!subChunks) return false;
+
+		for(var index = 0; index < subChunks.length; index++) {
+			var item = subChunks[index];
+
+			chunks.add(item);
+		}
+	}
+	return chunks;
+}
+
+class RemoveParentModulesPlugin {
+	apply(compiler) {
+		compiler.plugin("compilation", (compilation) => {
+			compilation.plugin(["optimize-chunks-basic", "optimize-extracted-chunks-basic"], (chunks) => {
+				for(var index = 0; index < chunks.length; index++) {
+					var chunk = chunks[index];
+					if(chunk.parents.length === 0) continue;
+
+					// TODO consider Map when performance has improved https://gist.github.com/sokra/b36098368da7b8f6792fd7c85fca6311
+					var cache = Object.create(null);
+					var modules = chunk.getModules();
+					for(var i = 0; i < modules.length; i++) {
+						var module = modules[i];
+
+						var dId = module.getChunkIdsIdent();
+						var parentChunksWithModule;
+						if(dId === null) {
+							parentChunksWithModule = allHaveModule(chunk.parents, module);
+						} else if(dId in cache) {
+							parentChunksWithModule = cache[dId];
+						} else {
+							parentChunksWithModule = cache[dId] = allHaveModule(chunk.parents, module);
+						}
+						if(parentChunksWithModule) {
+							module.rewriteChunkInReasons(chunk, Array.from(parentChunksWithModule));
+							chunk.removeModule(module);
+						}
+					}
+				}
+			});
+		});
+	}
+}
+module.exports = RemoveParentModulesPlugin;