webpack/lib/UmdMainTemplatePlugin.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
*/
var ConcatSource = require("webpack-core/lib/ConcatSource");
var OriginalSource = require("webpack-core/lib/OriginalSource");

function accessorToObjectAccess(accessor) {
	return accessor.map(function(a) {
		return "[" + JSON.stringify(a) + "]";
	}).join("");
}

function accessorAccess(base, accessor) {
	accessor = [].concat(accessor);
	return accessor.map(function(a, idx) {
		a = base + accessorToObjectAccess(accessor.slice(0, idx + 1));
		if(idx === accessor.length - 1) return a;
		return a + " = " + a + " || {}";
	}).join(", ");
}

function UmdMainTemplatePlugin(name, optionalAmdExternalAsGlobal) {
	this.name = name;
	this.optionalAmdExternalAsGlobal = optionalAmdExternalAsGlobal;
}
module.exports = UmdMainTemplatePlugin;
UmdMainTemplatePlugin.prototype.apply = function(mainTemplate) {
	mainTemplate.plugin("render", function(source, chunk, hash) {
		var externals = chunk.modules.filter(function(m) {
			return m.external;
		});
		var optionalExternals = [], requiredExternals = [];
		if(this.optionalAmdExternalAsGlobal) {
			externals.forEach(function(m) {
				if(m.optional) {
					optionalExternals.push(m);
				} else {
					requiredExternals.push(m);
				}
			});
			externals = requiredExternals.concat(optionalExternals);
		} else {
			requiredExternals = externals;
		}

		function replaceKeys(str) {
			return mainTemplate.applyPluginsWaterfall("asset-path", str, {
				hash: hash,
				chunk: chunk
			});
		}
		function externalsDepsArray(modules) {
			return "[" + replaceKeys(modules.map(function(m) {
				return JSON.stringify(typeof m.request === "object" ? m.request.amd : m.request);
			}).join(", ")) + "]";
		}
		function externalsRootArray(modules) {
			return replaceKeys(modules.map(function(m) {
				var request = m.request;
				if(typeof request === "object") request = request.root;
				return "root" + accessorToObjectAccess([].concat(request));
			}).join(", "));
		}
		function externalsRequireArray(type) {
			return replaceKeys(externals.map(function(m) {
				var request = m.request;
				if(typeof request === "object") request = request[type];
				if(Array.isArray(request)) {
					var expr = "require(" + JSON.stringify(request[0]) + ")" + accessorToObjectAccess(request.slice(1));
				} else
					var expr = "require(" + JSON.stringify(request) + ")";
				if(m.optional) {
					expr = "(function webpackLoadOptionalExternalModule() { try { return " + expr + "; } catch(e) {} }())";
				}
				return expr;
			}).join(", "));
		}
		function externalsArguments(modules) {
			return modules.map(function(m) {
				return "__WEBPACK_EXTERNAL_MODULE_" + m.id + "__";
			}).join(", ");
		}
		if(optionalExternals.length > 0) {
			var amdFactory = "function webpackLoadOptionalExternalModuleAmd(" + externalsArguments(requiredExternals) + ") {\n" +
			"			return factory(" + (
				requiredExternals.length > 0 ?
					externalsArguments(requiredExternals) + ", " + externalsRootArray(optionalExternals) :
					externalsRootArray(optionalExternals)
			) + ");\n" +
			"		}";
		} else {
			var amdFactory = "factory";
		}
		return new ConcatSource(new OriginalSource(
			"(function webpackUniversalModuleDefinition(root, factory) {\n" +
			"	if(typeof exports === 'object' && typeof module === 'object')\n" +
			"		module.exports = factory(" + externalsRequireArray("commonjs2") + ");\n" +
			"	else if(typeof define === 'function' && define.amd)\n" +
			(requiredExternals.length > 0 ?
			"		define(" + externalsDepsArray(requiredExternals) + ", " + amdFactory + ");\n"
			:
			"		define(" + amdFactory + ");\n"
			) +
			(this.name ?
			"	else if(typeof exports === 'object')\n" +
			"		exports[" + JSON.stringify(replaceKeys([].concat(this.name).pop())) + "] = factory(" + externalsRequireArray("commonjs") + ");\n" +
			"	else\n" +
			"		" + replaceKeys(accessorAccess("root", this.name)) + " = factory(" + externalsRootArray(externals) + ");\n"
			:
			"	else {\n" +
			(externals.length > 0 ?
			"		var a = typeof exports === 'object' ? factory(" + externalsRequireArray("commonjs") + ") : factory(" + externalsRootArray(externals) + ");\n"
			:
			"		var a = factory();\n"
			) +
			"		for(var i in a) (typeof exports === 'object' ? exports : root)[i] = a[i];\n" +
			"	}\n"
			) +
			"})(this, function(" + externalsArguments(externals) + ") {\nreturn ", "webpack/universalModuleDefinition"), source, "\n});\n");
	}.bind(this));
	mainTemplate.plugin("global-hash-paths", function(paths) {
		if (this.name) paths = paths.concat(this.name);
		return paths;
	}.bind(this));
	mainTemplate.plugin("hash", function(hash) {
		hash.update("umd");
		hash.update(this.name + "");
	}.bind(this));
};