Method apply

lib/DotenvPlugin.js:230–287

* 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.validate.tap(PLUGIN_NAME, () => {
			compiler.validate(
				() => {
					const { definitions } = require(class="st">"../schemas/WebpackOptions.json");

					return {
						definitions,
						oneOf: [{ $ref: class="st">"#/definitions/DotenvPluginOptions" }]
					};
				},
				this.options,
				{
					name: class="st">"Dotenv Plugin",
					baseDataPath: class="st">"options"
				}
			);
		});
		const definePlugin = new compiler.webpack.DefinePlugin({});
		const prefixes = Array.isArray(this.options.prefix)
			? this.options.prefix
			: [this.options.prefix || class="st">"WEBPACK_"];
		/** @type {string | false} */
		const dir =
			typeof this.options.dir === class="st">"string"
				? this.options.dir
				: typeof this.options.dir === class="st">"undefined"
					? compiler.context
					: this.options.dir;

		/** @type {undefined | Snapshot} */
		let snapshot;

		const cache = compiler.getCache(PLUGIN_NAME);
		const identifier = JSON.stringify(
			this.options.template || DEFAULT_TEMPLATE
		);
		const itemCache = cache.getItemCache(identifier, null);

		compiler.hooks.beforeCompile.tapPromise(PLUGIN_NAME, async () => {
			const { parsed, snapshot: newSnapshot } = dir
				? await this._loadEnv(compiler, itemCache, dir)
				: { parsed: {} };
			const env = this._getEnv(prefixes, parsed);

			definePlugin.definitions = envToDefinitions(env || {});
			snapshot = newSnapshot;
		});

		compiler.hooks.compilation.tap(PLUGIN_NAME, (compilation) => {
			if (snapshot) {
				compilation.fileDependencies.addAll(snapshot.getFileIterable());
				compilation.missingDependencies.addAll(snapshot.getMissingIterable());
			}
		});

		definePlugin.apply(compiler);
	}