Method apply

lib/DefinePlugin.js:391–944

* Applies the plugin by registering its hooks on the compiler. * @param {Compiler} compiler the compiler instance * @returns {void}

(compiler)

	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.compilation.tap(
			PLUGIN_NAME,
			(compilation, { normalModuleFactory }) => {
				const definitions = this.definitions;
				const hooks = DefinePlugin.getCompilationHooks(compilation);

				hooks.definitions.tap(PLUGIN_NAME, (previousDefinitions) => ({
					...previousDefinitions,
					...definitions
				}));

				/**
				 * @type {Map<string, Set<string>>}
				 */
				const finalByNestedKey = new Map();
				/**
				 * @type {Map<string, Set<string>>}
				 */
				const nestedByFinalKey = new Map();

				const logger = compilation.getLogger(class="st">"webpack.DefinePlugin");
				compilation.dependencyTemplates.set(
					ConstDependency,
					new ConstDependency.Template()
				);
				const { runtimeTemplate } = compilation;

				const mainHash = createHash(compilation.outputOptions.hashFunction);
				mainHash.update(
					/** @type {string} */
					(compilation.valueCacheVersions.get(VALUE_DEP_MAIN)) || class="st">""
				);

				/**
				 * Handles the hook callback for this code path.
				 * @param {JavascriptParser} parser Parser
				 * @returns {void}
				 */
				const handler = (parser) => {
					/** @type {Set<string>} */
					const hooked = new Set();
					const mainValue =
						/** @type {ValueCacheVersion} */
						(compilation.valueCacheVersions.get(VALUE_DEP_MAIN));
					parser.hooks.program.tap(PLUGIN_NAME, () => {
						const buildInfo = /** @type {NormalModuleBuildInfo} */ (
							parser.state.module.buildInfo
						);
						if (!buildInfo.valueDependencies) {
							buildInfo.valueDependencies = new Map();
						}
						buildInfo.valueDependencies.set(VALUE_DEP_MAIN, mainValue);
					});

					/**
					 * Adds value dependency.
					 * @param {string} key key