webpack/lib/dependencies/ImportMetaContextPlugin.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 Ivan Kopeykin @vankop
*/

"use strict";

const ContextElementDependency = require("./ContextElementDependency");
const ImportMetaContextDependency = require("./ImportMetaContextDependency");
const ImportMetaContextDependencyParserPlugin = require("./ImportMetaContextDependencyParserPlugin");

/** @typedef {import("../../declarations/WebpackOptions").ResolveOptions} ResolveOptions */
/** @typedef {import("../Compiler")} Compiler */

class ImportMetaContextPlugin {
	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.compilation.tap(
			"RequireContextPlugin",
			(compilation, { contextModuleFactory, normalModuleFactory }) => {
				compilation.dependencyFactories.set(
					ImportMetaContextDependency,
					contextModuleFactory
				);
				compilation.dependencyTemplates.set(
					ImportMetaContextDependency,
					new ImportMetaContextDependency.Template()
				);
				compilation.dependencyFactories.set(
					ContextElementDependency,
					normalModuleFactory
				);

				const handler = (parser, parserOptions) => {
					if (
						parserOptions.importMetaContext !== undefined &&
						!parserOptions.importMetaContext
					)
						return;

					new ImportMetaContextDependencyParserPlugin().apply(parser);
				};

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

module.exports = ImportMetaContextPlugin;