webpack/lib/CommonJsStuffPlugin.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");

class CommonJsStuffPlugin {
	apply(compiler) {
		compiler.hooks.compilation.tap(
			"CommonJsStuffPlugin",
			(compilation, { normalModuleFactory }) => {
				const handler = (parser, parserOptions) => {
					parser.hooks.expression
						.for("require.main.require")
						.tap(
							"CommonJsStuffPlugin",
							ParserHelpers.expressionIsUnsupported(
								parser,
								"require.main.require is not supported by webpack."
							)
						);
					parser.hooks.expression
						.for("module.parent.require")
						.tap(
							"CommonJsStuffPlugin",
							ParserHelpers.expressionIsUnsupported(
								parser,
								"module.parent.require is not supported by webpack."
							)
						);
					parser.hooks.expression
						.for("require.main")
						.tap(
							"CommonJsStuffPlugin",
							ParserHelpers.toConstantDependencyWithWebpackRequire(
								parser,
								"__webpack_require__.c[__webpack_require__.s]"
							)
						);
					parser.hooks.expression
						.for("module.loaded")
						.tap("CommonJsStuffPlugin", expr => {
							parser.state.module.buildMeta.moduleConcatenationBailout =
								"module.loaded";
							return ParserHelpers.toConstantDependency(parser, "module.l")(
								expr
							);
						});
					parser.hooks.expression
						.for("module.id")
						.tap("CommonJsStuffPlugin", expr => {
							parser.state.module.buildMeta.moduleConcatenationBailout =
								"module.id";
							return ParserHelpers.toConstantDependency(parser, "module.i")(
								expr
							);
						});
					parser.hooks.expression
						.for("module.exports")
						.tap("CommonJsStuffPlugin", () => {
							const module = parser.state.module;
							const isHarmony =
								module.buildMeta && module.buildMeta.exportsType;
							if (!isHarmony) return true;
						});
					parser.hooks.evaluateIdentifier
						.for("module.hot")
						.tap(
							"CommonJsStuffPlugin",
							ParserHelpers.evaluateToIdentifier("module.hot", false)
						);
					parser.hooks.expression
						.for("module")
						.tap("CommonJsStuffPlugin", () => {
							const module = parser.state.module;
							const isHarmony =
								module.buildMeta && module.buildMeta.exportsType;
							let moduleJsPath = path.join(
								__dirname,
								"..",
								"buildin",
								isHarmony ? "harmony-module.js" : "module.js"
							);
							if (module.context) {
								moduleJsPath = path.relative(
									parser.state.module.context,
									moduleJsPath
								);
								if (!/^[A-Z]:/i.test(moduleJsPath)) {
									moduleJsPath = `./${moduleJsPath.replace(/\\/g, "/")}`;
								}
							}
							return ParserHelpers.addParsedVariableToModule(
								parser,
								"module",
								`require(${JSON.stringify(moduleJsPath)})(module)`
							);
						});
				};

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