import type { ProviderAdapter, ProviderRequestOptions, ProviderResponse, StreamChunk, AiMessage, FinishReason } from '../../types.js';
import type { GoogleCacheRegistry } from '../google-cache-registry.js';
import type { GoogleConfig } from './config.js';
export declare class GoogleAdapter implements ProviderAdapter {
    private readonly config;
    private readonly model;
    private readonly cacheRegistry?;
    constructor(config: GoogleConfig, model: string, cacheRegistry?: GoogleCacheRegistry | undefined);
    private readonly getClient;
    /**
     * Build the request payload, consulting the cache registry if `options.cache`
     * is set. Returns the payload for `generateContent` / `generateContentStream`
     * plus the cache key (so the caller can `forget()` it on a 404 stale-cache
     * retry).
     */
    private buildPayload;
    generate(options: ProviderRequestOptions): Promise<ProviderResponse>;
    stream(options: ProviderRequestOptions): AsyncIterable<StreamChunk>;
}
/**
 * Map a Gemini candidate finish reason onto the neutral {@link FinishReason}.
 * A function-call turn reports `STOP`, so that case is decided by the caller
 * having seen a `functionCall` part rather than by the reason itself.
 */
export declare function mapGeminiFinishReason(reason: string, sawFunctionCall: boolean): FinishReason;
export declare function toGeminiContents(messages: AiMessage[]): {
    system: string | undefined;
    contents: unknown[];
};
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