export declare function ipfsGatewayUrl(cid: string | undefined, gatewayHostname?: string): string;
/**
 * Return a hex-encoded CID to store on-chain.
 * Hex-encoded CIDs are used to store some CIDs on-chain because they are more gas-efficient.
 */
export declare function encodeIpfsUri(cid: string): string;
/**
 * Return the IPFS CID from a given hex-endoded string.
 * Hex-encoded CIDs are used to store some CIDs on-chain because they are more gas-efficient.
 */
export declare function decodeEncodedIpfsUri(hex: string): string;
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