webpack/lib/ExtendedAPIPlugin.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 Template = require("./Template");
const ConstDependency = require("./dependencies/ConstDependency");
const ParserHelpers = require("./ParserHelpers");
const NullFactory = require("./NullFactory");

const REPLACEMENTS = {
	// eslint-disable-next-line camelcase
	__webpack_hash__: "__webpack_require__.h",
	// eslint-disable-next-line camelcase
	__webpack_chunkname__: "__webpack_require__.cn"
};
const REPLACEMENT_TYPES = {
	// eslint-disable-next-line camelcase
	__webpack_hash__: "string",
	// eslint-disable-next-line camelcase
	__webpack_chunkname__: "string"
};

class ExtendedAPIPlugin {
	apply(compiler) {
		compiler.hooks.compilation.tap(
			"ExtendedAPIPlugin",
			(compilation, { normalModuleFactory }) => {
				compilation.dependencyFactories.set(ConstDependency, new NullFactory());
				compilation.dependencyTemplates.set(
					ConstDependency,
					new ConstDependency.Template()
				);

				const mainTemplate = compilation.mainTemplate;
				mainTemplate.hooks.requireExtensions.tap(
					"ExtendedAPIPlugin",
					(source, chunk, hash) => {
						const buf = [source];
						buf.push("");
						buf.push("// __webpack_hash__");
						buf.push(`${mainTemplate.requireFn}.h = ${JSON.stringify(hash)};`);
						buf.push("");
						buf.push("// __webpack_chunkname__");
						buf.push(
							`${mainTemplate.requireFn}.cn = ${JSON.stringify(chunk.name)};`
						);
						return Template.asString(buf);
					}
				);
				mainTemplate.hooks.globalHash.tap("ExtendedAPIPlugin", () => true);

				const handler = (parser, parserOptions) => {
					Object.keys(REPLACEMENTS).forEach(key => {
						parser.hooks.expression
							.for(key)
							.tap(
								"ExtendedAPIPlugin",
								ParserHelpers.toConstantDependencyWithWebpackRequire(
									parser,
									REPLACEMENTS[key]
								)
							);
						parser.hooks.evaluateTypeof
							.for(key)
							.tap(
								"ExtendedAPIPlugin",
								ParserHelpers.evaluateToString(REPLACEMENT_TYPES[key])
							);
					});
				};

				normalModuleFactory.hooks.parser
					.for("javascript/auto")
					.tap("ExtendedAPIPlugin", handler);
				normalModuleFactory.hooks.parser
					.for("javascript/dynamic")
					.tap("ExtendedAPIPlugin", handler);
				normalModuleFactory.hooks.parser
					.for("javascript/esm")
					.tap("ExtendedAPIPlugin", handler);
			}
		);
	}
}

module.exports = ExtendedAPIPlugin;