import type { RequestFormatShorthand } from '../index.js';
import type { CID } from 'multiformats/cid';
interface GetETagArg {
    cid: CID;
    reqFormat?: RequestFormatShorthand;
    rangeStart?: number;
    rangeEnd?: number;
    /**
     * Weak Etag is used when we can't guarantee byte-for-byte-determinism (generated, or mutable content).
     * Some examples:
     * - IPNS requests
     * - CAR streamed with blocks in non-deterministic order
     * - TAR streamed with files in non-deterministic order
     */
    weak?: boolean;
    /**
     * A custom prefix to use for the content of the etag. This is needed for some cases (like dir-index-html) where we need to use a custom prefix for the etag.
     */
    contentPrefix?: string;
}
/**
 * etag
 * you need to wrap cid  with ""
 * we use strong Etags for immutable responses and weak one (prefixed with W/ ) for mutable/generated ones (ipns, car, tar, and generated HTML).
 * block and car responses should have different etag than deserialized one, so you can add some prefix like we do in existing gateway
 *
 * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag
 * @see https://specs.ipfs.tech/http-gateways/path-gateway/#etag-response-header
 */
export declare function getETag({ cid, reqFormat, weak, rangeStart, rangeEnd, contentPrefix }: GetETagArg): string;
export {};
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