/**
 * VertexLLMProvider — Vertex AI Gemini via @google-cloud/vertexai.
 *
 * Generalized provider with no idapixl-specific dependencies.
 * Supports systemPrompt, schema instructions, and JSON fence stripping.
 */
import type { LLMProvider, GenerateOptions, GenerateJSONOptions } from '../core/llm.js';
export interface VertexLLMOptions {
    /** GCP project ID. Falls back to GOOGLE_CLOUD_PROJECT env var. */
    projectId?: string;
    /** GCP region (default: us-central1). */
    location?: string;
    /** Gemini model ID (default: gemini-2.5-flash). */
    model?: string;
}
export declare class VertexLLMProvider implements LLMProvider {
    readonly name = "vertex-gemini";
    readonly modelId: string;
    private readonly projectId;
    private readonly vertexAI;
    constructor(options: VertexLLMOptions, vertexAI: import('@google-cloud/vertexai').VertexAI);
    generate(prompt: string, options?: GenerateOptions): Promise<string>;
    generateJSON<T>(prompt: string, options?: GenerateJSONOptions): Promise<T>;
}
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