import { UsageMetadata } from "../_core/types/index.js";
import { GoogleUsageMetadata } from "./types.js";
export declare function mapAspectRatioToResolution(aspectRatio?: string): string;
export declare function mapGoogleFinishReason(finishReason: any, defaultReason?: string): string;
export declare function extractFinishReason(response: any): string | undefined;
export declare function extractConfidenceScore(response: any): number | undefined;
export declare function mapGoogleUsageMetadata(meta?: GoogleUsageMetadata): UsageMetadata | undefined;
export declare function trackGoogleUsageAsync(params: {
    transactionId: string;
    model: string;
    startTime: Date;
    endTime: Date;
    response: any;
    operationType: "CHAT" | "EMBED";
    isStreaming: boolean;
    modelSource: "GOOGLE" | "GOOGLE_VERTEX_AI";
    usageMetadata?: GoogleUsageMetadata;
    prompts?: string[];
    timeToFirstToken?: number;
}): Promise<void>;
export declare function generateTransactionId(): string;
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