/**
 * Google Vertex AI Adapter - Enterprise GCP-based deployment
 * Uses GCP service account authentication
 */
import { BaseAdapter, AdapterConfig, AdapterResponse, RequestOptions, StreamOptions, HealthCheckResult } from './base-adapter';
import { VendorRequest, VendorResponse, VendorStreamChunk, GoogleRequest } from '../../types/vendors';
export interface GoogleVertexAIConfig extends AdapterConfig {
    project_id: string;
    location: string;
    access_token?: string;
    service_account_key?: string;
}
export declare class GoogleVertexAIAdapter extends BaseAdapter {
    private client;
    private readonly model_name;
    private readonly project_id;
    private readonly location;
    constructor(model_name: string, config: GoogleVertexAIConfig);
    protected getDefaultEndpoint(): string;
    protected getHeaders(): Record<string, string>;
    execute(request: VendorRequest, options?: RequestOptions): Promise<AdapterResponse>;
    stream(request: VendorRequest, options: StreamOptions): Promise<AsyncIterable<VendorStreamChunk>>;
    private createStreamIterator;
    transformRequest(request: VendorRequest): GoogleRequest;
    transformResponse(response: unknown): VendorResponse;
    transformStreamChunk(chunk: unknown): VendorStreamChunk;
    healthCheck(): Promise<HealthCheckResult>;
    private handleVertexError;
    private getModelPricing;
    private getModelMaxTokens;
}
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