import type { DecisionMediaLimits, DecisionMediaResult, DecisionMediaSource } from "../types/index.js";
/**
 * Turn the caller's images and video into `data:` URLs, or say why not.
 * Runs before any request, so every refusal costs nothing and none is retried.
 */
export declare function prepareDecisionMedia(request: {
    images?: readonly DecisionMediaSource[];
    video?: DecisionMediaSource;
}, limits: DecisionMediaLimits | undefined, vendor: string, alternatives: readonly string[]): Promise<DecisionMediaResult>;