/**
 * Authentication provider for the Cloud Build plugin.
 *
 * Priority order:
 * 1. Explicit serviceAccountKey in config (highest priority)
 * 2. Application Default Credentials (ADC) as fallback
 */
import { CloudBuildClient } from '@google-cloud/cloudbuild';
import { Storage } from '@google-cloud/storage';
import type { AuthOptions, AuthProvider } from './types.js';
export declare class DefaultAuthProvider implements AuthProvider {
    private readonly projectId;
    private readonly credentials?;
    private cloudBuildClient?;
    private storageClient?;
    constructor(options: AuthOptions);
    getCloudBuildClient(): CloudBuildClient;
    getStorageClient(): Storage;
    private createCloudBuildClient;
    private createStorageClient;
}
/**
 * Create an auth provider from options.
 */
export declare function createAuthProvider(options: AuthOptions): AuthProvider;
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