/**
 * Google (Gemini / Vertex AI) completion engine.
 *
 * Moved from packages/adapters/cli/src/commands/launch-completion-engine.ts
 * so that the engine lives alongside the transport-adapter runtime.
 */
import type { CompletionEngine } from '../types.js';
export interface GoogleCompletionEngineOptions {
    apiBase?: string;
    apiKey: string;
    targetModel: string;
    provider?: string;
    project?: string;
    location?: string;
    useVertexAi?: boolean;
}
export declare function createGoogleCompletionEngine(options: GoogleCompletionEngineOptions): CompletionEngine;