Method _done

lib/Watching.js:273–365

* Processes the provided err. * @param {(Error | null)=} err an optional error * @param {Compilation=} compilation the compilation * @returns {void}

(err, compilation)

	 * @returns {void}
	 */
	_done(err, compilation) {
		this.running = false;

		const logger =
			/** @type {Logger} */
			(compilation && compilation.getLogger("webpack.Watching"));

		/** @type {Stats | undefined} */
		let stats;

		/**
		 * Processes the provided err.
		 * @param {Error} err error
		 * @param {ErrorCallback[]=} cbs callbacks
		 */
		const handleError = (err, cbs) => {
			this.compiler.hooks.failed.call(err);
			this.compiler.cache.beginIdle();
			this.compiler.idle = true;
			this.handler(err, /** @type {Stats} */ (stats));
			if (!cbs) {
				cbs = this.callbacks;
				this.callbacks = [];
			}
			for (const cb of cbs) cb(err);
		};

		if (
			this.invalid &&
			!this.suspended &&
			!this.blocked &&
			!(this._isBlocked() && (this.blocked = true))
		) {
			if (compilation) {
				logger.time("storeBuildDependencies");
				this.compiler.cache.storeBuildDependencies(
					compilation.buildDependencies,
					(err) => {
						logger.timeEnd("storeBuildDependencies");
						if (err) return handleError(err);
						this._go();
					}
				);
			} else {
				this._go();
			}
			return;
		}

		if (compilation) {
			compilation.startTime = /** @type {number} */ (this.startTime);
			compilation.endTime = Date.now();
			stats = new Stats(compilation);
		}
		this.startTime = null;
		if (err) return handleError(err);

		const cbs = this.callbacks;