Method apply

lib/optimize/SideEffectsFlagPlugin.js:140–675

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

(compiler)

	 * @returns {void}
	 */
	apply(compiler) {
		let cache = globToRegexpCache.get(compiler.root);
		if (cache === undefined) {
			cache = new Map();
			globToRegexpCache.set(compiler.root, cache);
		}
		compiler.hooks.compilation.tap(
			PLUGIN_NAME,
			(compilation, { normalModuleFactory }) => {
				const moduleGraph = compilation.moduleGraph;
				normalModuleFactory.hooks.module.tap(PLUGIN_NAME, (module, data) => {
					const resolveData = data.resourceResolveData;
					if (
						resolveData &&
						resolveData.descriptionFileData &&
						resolveData.relativePath
					) {
						const sideEffects = resolveData.descriptionFileData.sideEffects;
						if (sideEffects !== undefined) {
							if (module.factoryMeta === undefined) {
								module.factoryMeta = {};
							}
							const hasSideEffects = SideEffectsFlagPlugin.moduleHasSideEffects(
								resolveData.relativePath,
								/** @type {SideEffectsFlagValue} */ (sideEffects),
								/** @type {CacheItem} */ (cache)
							);
							module.factoryMeta.sideEffectFree = !hasSideEffects;
						}
					}

					return module;
				});
				normalModuleFactory.hooks.module.tap(PLUGIN_NAME, (module, data) => {
					const settings = data.settings;
					if (typeof settings.sideEffects === "boolean") {
						if (module.factoryMeta === undefined) {
							module.factoryMeta = {};
						}
						module.factoryMeta.sideEffectFree = !settings.sideEffects;
					}
					return module;
				});
				if (this._analyseSource) {
					/**
					 * Processes the provided parser.
					 * @param {JavascriptParser} parser the parser
					 * @returns {void}
					 */
					const applySideEffectsStmtHandler = (parser) => {
						/** @type {undefined | Statement | ModuleDeclaration | MaybeNamedFunctionDeclaration | MaybeNamedClassDeclaration} */
						let sideEffectsStatement;
						parser.hooks.program.tap(PLUGIN_NAME, () => {
							sideEffectsStatement = undefined;
						});
						parser.hooks.statement.tap(
							{ name: PLUGIN_NAME, stage: -100 },
							(statement) => {