/**
 * @license
 * Copyright Google LLC 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
 */
import { BuilderContext } from '@angular-devkit/architect';
import { BuildOptions, Metafile, OutputFile, PartialMessage } from 'esbuild';
import { InitialFileRecord } from './bundler-context';
export declare function logBuildStats(context: BuilderContext, metafile: Metafile, initial: Map<string, InitialFileRecord>, estimatedTransferSizes?: Map<string, number>): void;
export declare function calculateEstimatedTransferSizes(outputFiles: OutputFile[]): Promise<Map<string, number>>;
export declare function withSpinner<T>(text: string, action: () => T | Promise<T>): Promise<T>;
export declare function withNoProgress<T>(test: string, action: () => T | Promise<T>): Promise<T>;
export declare function logMessages(context: BuilderContext, { errors, warnings }: {
    errors?: PartialMessage[];
    warnings?: PartialMessage[];
}): Promise<void>;
/**
 * Generates a syntax feature object map for Angular applications based on a list of targets.
 * A full set of feature names can be found here: https://esbuild.github.io/api/#supported
 * @param target An array of browser/engine targets in the format accepted by the esbuild `target` option.
 * @returns An object that can be used with the esbuild build `supported` option.
 */
export declare function getFeatureSupport(target: string[]): BuildOptions['supported'];
export declare function writeResultFiles(outputFiles: OutputFile[], assetFiles: {
    source: string;
    destination: string;
}[] | undefined, outputPath: string): Promise<void>;
export declare function createOutputFileFromText(path: string, text: string): OutputFile;
/**
 * Transform browserlists result to esbuild target.
 * @see https://esbuild.github.io/api/#target
 */
export declare function transformSupportedBrowsersToTargets(supportedBrowsers: string[]): string[];