/**
 * Google Generative Language codec. Pure request/response translation between
 * OpenAI Chat Completions JSON and Gemini generateContent, including stream
 * deltas. HTTP transport lives in `google-backend.ts`.
 */
import { type ChatBody } from "./backend-core.js";
export declare function googleRequest(body: ChatBody): Record<string, unknown>;
type GoogleStreamToolPart = {
    providerIndex: number;
    toolIndex: number;
    id: string;
};
export type GoogleStreamPartState = {
    nextProviderIndex: number;
    nextToolIndex: number;
    openThoughtIndex?: number;
    toolParts: Map<string, GoogleStreamToolPart>;
    thoughtText: Map<number, string>;
};
export declare function createGoogleStreamPartState(): GoogleStreamPartState;
export declare function googleMessage(payload: Record<string, unknown>, streamState?: GoogleStreamPartState): Record<string, unknown>;
export declare function googleUsage(payload: Record<string, unknown>): {
    prompt_tokens: unknown;
    completion_tokens: unknown;
    total_tokens: unknown;
};
export declare function googleChatChunk(payload: Record<string, unknown>, model: string, streamState: GoogleStreamPartState): Record<string, unknown>;
export {};