webpack/lib/NodeStuffPlugin.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 BasicEvaluatedExpression = require("./BasicEvaluatedExpression");
var UnsupportedFeatureWarning = require("./UnsupportedFeatureWarning");

var NullFactory = require("./NullFactory");

function NodeStuffPlugin(options) {
	this.options = options;
}
module.exports = NodeStuffPlugin;
NodeStuffPlugin.prototype.apply = function(compiler) {
	compiler.plugin("compilation", function(compilation, params) {
		compilation.dependencyFactories.set(ConstDependency, new NullFactory());
		compilation.dependencyTemplates.set(ConstDependency, new ConstDependency.Template());
	});
	function ignore() { return true; }
	function setConstant(expressionName, value) {
		compiler.parser.plugin("expression " + expressionName, function(expr) {
			this.state.current.addVariable(expressionName, JSON.stringify(value));
			return true;
		});
	}
	function setModuleConstant(expressionName, fn) {
		compiler.parser.plugin("expression " + expressionName, function(expr) {
			this.state.current.addVariable(expressionName, JSON.stringify(fn(this.state.module)));
			return true;
		});
	}
	var context = compiler.context;
	if(this.options.__filename === "mock") {
		setConstant("__filename", "/index.js");
	} else if(this.options.__filename) {
		setModuleConstant("__filename", function(module) {
			return path.relative(context, module.resource);
		});
	}
	compiler.parser.plugin("evaluate Identifier __filename", function(expr) {
		if(!this.state.module) return;
		var res = new BasicEvaluatedExpression();
		res.setString(this.state.module.splitQuery(this.state.module.resource)[0]);
		res.setRange(expr.range);
		return res;
	});
	if(this.options.__dirname === "mock") {
		setConstant("__dirname", "/");
	} else if(this.options.__dirname) {
		setModuleConstant("__dirname", function(module) {
			return path.relative(context, module.context);
		});
	}
	compiler.parser.plugin("evaluate Identifier __dirname", function(expr) {
		if(!this.state.module) return;
		var res = new BasicEvaluatedExpression();
		res.setString(this.state.module.context);
		res.setRange(expr.range);
		return res;
	});
	compiler.parser.plugin("expression require.main", function(expr) {
		var dep = new ConstDependency("__webpack_require__.c[0]", expr.range);
		dep.loc = expr.loc;
		this.state.current.addDependency(dep);
		return true;
	});
	compiler.parser.plugin("expression require.extensions", function(expr) {
		var dep = new ConstDependency("(void 0)", expr.range);
		dep.loc = expr.loc;
		this.state.current.addDependency(dep);
		if(!this.state.module) return;
		this.state.module.warnings.push(new UnsupportedFeatureWarning(this.state.module, "require.extensions is not supported by webpack. Use a loader instead."));
		return true;
	});
	compiler.parser.plugin("expression module.exports", ignore);
	compiler.parser.plugin("expression module.loaded", ignore);
	compiler.parser.plugin("expression module.id", ignore);
	compiler.parser.plugin("evaluate Identifier module.hot", function(expr) {
		return new BasicEvaluatedExpression().setBoolean(false).setRange(expr.range);
	});
	compiler.parser.plugin("expression module", function(expr) {
		return ModuleParserHelpers.addParsedVariable(this, "module", "require(" + JSON.stringify(path.join(__dirname, "..", "buildin", "module.js")) + ")(module)");
	});
};