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, jsx, es7, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
"use strict";

const path = require("path");
const ParserHelpers = require("./ParserHelpers");
const ConstDependency = require("./dependencies/ConstDependency");

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

class NodeStuffPlugin {
	constructor(options) {
		this.options = options;
	}

	apply(compiler) {
		const options = this.options;
		compiler.hooks.compilation.tap(
			"NodeStuffPlugin",
			(compilation, { normalModuleFactory }) => {
				compilation.dependencyFactories.set(ConstDependency, new NullFactory());
				compilation.dependencyTemplates.set(
					ConstDependency,
					new ConstDependency.Template()
				);

				const handler = (parser, parserOptions) => {
					if (parserOptions.node === false) return;

					let localOptions = options;
					if (parserOptions.node) {
						localOptions = Object.assign({}, localOptions, parserOptions.node);
					}

					const setConstant = (expressionName, value) => {
						parser.hooks.expression
							.for(expressionName)
							.tap("NodeStuffPlugin", () => {
								parser.state.current.addVariable(
									expressionName,
									JSON.stringify(value)
								);
								return true;
							});
					};

					const setModuleConstant = (expressionName, fn) => {
						parser.hooks.expression
							.for(expressionName)
							.tap("NodeStuffPlugin", () => {
								parser.state.current.addVariable(
									expressionName,
									JSON.stringify(fn(parser.state.module))
								);
								return true;
							});
					};
					const context = compiler.context;
					if (localOptions.__filename) {
						if (localOptions.__filename === "mock") {
							setConstant("__filename", "/index.js");
						} else {
							setModuleConstant("__filename", module =>
								path.relative(context, module.resource)
							);
						}
						parser.hooks.evaluateIdentifier
							.for("__filename")
							.tap("NodeStuffPlugin", expr => {
								if (!parser.state.module) return;
								const resource = parser.state.module.resource;
								const i = resource.indexOf("?");
								return ParserHelpers.evaluateToString(
									i < 0 ? resource : resource.substr(0, i)
								)(expr);
							});
					}
					if (localOptions.__dirname) {
						if (localOptions.__dirname === "mock") {
							setConstant("__dirname", "/");
						} else {
							setModuleConstant("__dirname", module =>
								path.relative(context, module.context)
							);
						}
						parser.hooks.evaluateIdentifier
							.for("__dirname")
							.tap("NodeStuffPlugin", expr => {
								if (!parser.state.module) return;
								return ParserHelpers.evaluateToString(
									parser.state.module.context
								)(expr);
							});
					}
					parser.hooks.expression
						.for("require.extensions")
						.tap(
							"NodeStuffPlugin",
							ParserHelpers.expressionIsUnsupported(
								parser,
								"require.extensions is not supported by webpack. Use a loader instead."
							)
						);
				};

				normalModuleFactory.hooks.parser
					.for("javascript/auto")
					.tap("NodeStuffPlugin", handler);
				normalModuleFactory.hooks.parser
					.for("javascript/dynamic")
					.tap("NodeStuffPlugin", handler);
			}
		);
	}
}
module.exports = NodeStuffPlugin;