import type { KeyFetcher } from './jwk-fetcher';
import type { RS256Token } from './jwt-decoder';
import type { KeyStorer } from './key-store';
export declare const rs256alg: RsaHashedKeyGenParams;
export interface SignatureVerifier {
    verify(token: RS256Token): Promise<void>;
}
/**
 * Class for verifying JWT signature with a public key.
 */
export declare class PublicKeySignatureVerifier implements SignatureVerifier {
    private keyFetcher;
    constructor(keyFetcher: KeyFetcher);
    static withCertificateUrl(clientCertUrl: string, keyStorer: KeyStorer): PublicKeySignatureVerifier;
    /**
     * Verifies the signature of a JWT using the provided secret or a function to fetch
     * the public key.
     *
     * @param token - The JWT to be verified.
     * @throws If the JWT is not a valid RS256 token.
     * @returns A Promise resolving for a token with a valid signature.
     */
    verify(token: RS256Token): Promise<void>;
    private verifySignature;
    private fetchPublicKeys;
}
/**
 * Class for verifying unsigned (emulator) JWTs.
 */
export declare class EmulatorSignatureVerifier implements SignatureVerifier {
    verify(): Promise<void>;
}