import { Ed25519Signer, HubAsyncResult } from '@farcaster/core';
/**
 * External Ed25519 signer that allows signatures to be computed by an external service.
 */
export declare class ExternalEd25519Signer extends Ed25519Signer {
    private readonly _signMessageHash;
    private readonly _getSignerKey;
    /**
       * Creates a new ExternalEd25519Signer. This class allows the signing of Farcaster message hashes to be delegated to an external service
       * such that a private key is not required to be in memory.
       *
       * @param signMessageHash Proxy function that signs a message hash. Called internally by _signMessageHash.
       * @param getSignerKey Proxy function that returns the public key of the signer. Called internally by _getSignerKey.
       */
    constructor(signMessageHash: (messageHash: Uint8Array) => Promise<Uint8Array>, getSignerKey: () => Promise<Uint8Array>);
    /**
       * Returns the public key of the signer as a Uint8Array.
       *
       * @returns public key of the signer
       */
    getSignerKey(): HubAsyncResult<Uint8Array>;
    /**
       * Signs a Farcaster message hash.
       *
       * @param hash blake3 hash of the Farcaster message to be signed
       * @returns signature of the hash
       */
    signMessageHash(hash: Uint8Array): HubAsyncResult<Uint8Array>;
}