/**
 * R2-backed cache for generated media (TTS audio, OG images, charts).
 */
export interface R2CacheOptions {
    bucket: R2Bucket;
    publicHost: string;
}
export interface ProducerResult {
    body: ArrayBuffer | ReadableStream | Blob | string;
    contentType: string;
}
export declare class R2Cache {
    readonly bucket: R2Bucket;
    readonly publicHost: string;
    constructor({ bucket, publicHost }: R2CacheOptions);
    getOrCreate(key: string, producer: () => Promise<ProducerResult>): Promise<{
        url: string;
        fromCache: boolean;
    }>;
    urlFor(key: string): string;
}
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