Method _addModule

lib/Compilation.js:1619–1656

* Adds the provided module to the compilation. * @param {Module} module module to be added that was created * @param {ModuleCallback} callback returns the module in the compilation, * it could be the passed one (if new), or an already existing in the compilation * @returns {void}

(module, callback)

	 * @returns {void}
	 */
	_addModule(module, callback) {
		const identifier = module.identifier();
		const alreadyAddedModule = this._modules.get(identifier);
		if (alreadyAddedModule) {
			return callback(null, alreadyAddedModule);
		}

		const currentProfile = this.profile
			? this.moduleGraph.getProfile(module)
			: undefined;
		if (currentProfile !== undefined) {
			currentProfile.markRestoringStart();
		}

		this._modulesCache.get(identifier, null, (err, cacheModule) => {
			if (err) return callback(new ModuleRestoreError(module, err));

			if (currentProfile !== undefined) {
				currentProfile.markRestoringEnd();
				currentProfile.markIntegrationStart();
			}

			if (cacheModule) {
				cacheModule.updateCacheModule(module);

				module = cacheModule;
			}
			this._modules.set(identifier, module);
			this.modules.add(module);
			if (this._backCompat) {
				ModuleGraph.setModuleGraphForModule(module, this.moduleGraph);
			}
			if (currentProfile !== undefined) {
				currentProfile.markIntegrationEnd();
			}
			callback(null, module);
		});
	}

	/**
	 * Fetches a module from a compilation by its identifier