Method runAsChild

lib/Compiler.js:691–740

* Processes the provided run as child callback. * @param {RunAsChildCallback} callback signals when the call finishes * @returns {void}

(callback)

	 * @returns {void}
	 */
	runAsChild(callback) {
		const startTime = Date.now();

		/**
		 * Processes the provided err.
		 * @param {Error | null} err error
		 * @param {Chunk[]=} entries entries
		 * @param {Compilation=} compilation compilation
		 */
		const finalCallback = (err, entries, compilation) => {
			try {
				callback(err, entries, compilation);
			} catch (runAsChildErr) {
				const err = new WebpackError(
					`compiler.runAsChild callback error: ${runAsChildErr}`,
					{ cause: runAsChildErr }
				);
				err.details = /** @type {Error} */ (runAsChildErr).stack;
				/** @type {Compilation} */
				(this.parentCompilation).errors.push(err);
			}
		};

		this.compile((err, _compilation) => {
			if (err) return finalCallback(err);

			const compilation = /** @type {Compilation} */ (_compilation);
			const parentCompilation = /** @type {Compilation} */ (
				this.parentCompilation
			);

			parentCompilation.children.push(compilation);

			for (const { name, source, info } of compilation.getAssets()) {
				parentCompilation.emitAsset(name, source, info);
			}

			/** @type {Chunk[]} */
			const entries = [];

			for (const ep of compilation.entrypoints.values()) {
				entries.push(...ep.chunks);
			}

			compilation.startTime = startTime;
			compilation.endTime = Date.now();

			return finalCallback(null, entries, compilation);
		});
	}

	purgeInputFileSystem() {
		if (this.inputFileSystem && this.inputFileSystem.purge) {