@angular-devkit/build-angular/src/transforms.d.ts

Angular Webpack Build Facade

/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
export declare type ExecutionTransformer<T> = (input: T) => T | Promise<T>;