webpack/lib/node/NodeSourcePlugin.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 path = require("path");
var ModuleAliasPlugin = require("enhanced-resolve/lib/ModuleAliasPlugin");
var ModuleParserHelpers = require("../ModuleParserHelpers");
var ConstDependency = require("../dependencies/ConstDependency");
var nodeLibsBrowser = require("node-libs-browser");

function NodeSourcePlugin(options) {
	this.options = options;
}
module.exports = NodeSourcePlugin;
NodeSourcePlugin.prototype.apply = function(compiler) {
	function ignore() { return true; }
	function getPathToModule(module, type) {
		if(type === true || (type === undefined && nodeLibsBrowser[module])) {
			if(!nodeLibsBrowser[module]) throw new Error("No browser version for node.js core module '" + module + "' available");
			return nodeLibsBrowser[module];
		} else if(type === "mock") {
			return require.resolve("node-libs-browser/mock/" + module);
		} else if(type === "empty") {
			return require.resolve("node-libs-browser/mock/empty");
		} else return module;
	}
	if(this.options.process) {
		var processType = this.options.process;
		compiler.parser.plugin("expression process", function(expr) {
			return ModuleParserHelpers.addParsedVariable(this, "process", "require(" + JSON.stringify(getPathToModule("process", processType)) + ")");
		});
	}
	if(this.options.global) {
		compiler.parser.plugin("expression global", function(expr) {
			this.state.module.addVariable("global", "(function() { return this; }())");
			return true;
		});
	}
	if(this.options.console) {
		var consoleType = this.options.console;
		compiler.parser.plugin("expression console", function(expr) {
			return ModuleParserHelpers.addParsedVariable(this, "console", "require(" + JSON.stringify(getPathToModule("console", consoleType)) + ")");
		});
	}
	if(this.options.buffer) {
		var bufferType = this.options.buffer;
		compiler.parser.plugin("expression Buffer", function(expr) {
			return ModuleParserHelpers.addParsedVariable(this, "Buffer", "require(" + JSON.stringify(getPathToModule("buffer", bufferType)) + ").Buffer");
		});
	}
	var options = this.options;
	compiler.plugin("after-resolvers", function(compiler) {
		var alias = {};
		Object.keys(nodeLibsBrowser).forEach(function(lib) {
			if(options[lib] !== false)
				alias[lib] = getPathToModule(lib, options[lib]);
		});
		if(Object.keys(alias).length > 0) {
			compiler.resolvers.normal.apply(
				new ModuleAliasPlugin(alias)
			);
		}
	});
};