/**
 * Google AI Studio / Gemini API request transformer and usage extractor.
 * Intercepts /google-ai-studio/v1beta/models/*:generateContent and :streamGenerateContent
 * requests, extracts static system instructions, renders them to PNG image parts, and
 * passes transformed payloads to Google AI Studio.
 */
import { type TransformInfo } from './transform.js';
export interface GooglePart {
    text?: string;
    inlineData?: {
        mimeType: string;
        data: string;
    };
    functionCall?: {
        name?: string;
        args?: unknown;
        [key: string]: unknown;
    };
    functionResponse?: {
        name?: string;
        response?: unknown;
        parts?: GooglePart[];
        [key: string]: unknown;
    };
    [key: string]: unknown;
}
export interface GoogleContent {
    role?: 'user' | 'model' | string;
    parts?: GooglePart[];
    [key: string]: unknown;
}
export interface GoogleGenerateContentRequest {
    contents?: GoogleContent[];
    systemInstruction?: {
        role?: string;
        parts?: GooglePart[];
        [key: string]: unknown;
    };
    tools?: unknown[];
    [key: string]: unknown;
}
export declare function parseGoogleModelFromPath(pathname: string): string | null;
/**
 * Normalizes Google turn roles so that:
 * 1. Adjacent turns with the same role are merged.
 * 2. The conversation starts with a user turn.
 * 3. The conversation ends with a user turn (never a model turn), avoiding
 *    Google AI Studio's 400 "Requests ending with a model turn are not supported."
 */
export declare function normalizeGoogleTurnRoles(contents: GoogleContent[]): GoogleContent[];
export declare function transformGoogleGenerateContent(bodyBytes: Uint8Array, modelName: string, options?: {
    compress?: boolean;
    compressTools?: boolean;
    compressToolResults?: boolean;
    collapseHistory?: boolean;
    minToolResultChars?: number;
    maxImagesPerToolResult?: number;
    cols?: number;
    reflow?: boolean;
}): Promise<{
    body: Uint8Array;
    info: TransformInfo;
}>;
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