export interface GoogleVisionInput {
    width: number;
    height: number;
    /** Google's estimator does not branch on detail; accepted for API parity. */
    detail?: 'low' | 'high' | 'auto';
}
/**
 * Google (Gemini) vision token estimator.
 *
 * Per Google guidance:
 * - Images ≤ 384×384 cost a flat 258 tokens.
 * - Larger images: 258 * ceil(width/768) * ceil(height/768), with a floor of 1 tile per axis.
 */
export declare const visionTokens: ({ width, height }: GoogleVisionInput) => number;
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