export type SignEncodeMethod = 'hex' | 'base64';
export type SignAlgorithm = 'SHA-256' | 'SHA-512';
/**
 * Similar to node crypto's `createHash()` function
 */
export type SignKeyType = 'HMAC' | 'RSASSA-PKCS1-v1_5' | 'Ed25519';
export declare function getSignKeyType(secret: string): SignKeyType;
/**
 * Sign a message, with a secret, using the Web Crypto API
 *
 * Ed25519 is stable as of v23.5.0, but also not available in all browsers
 */
export declare function signMessage(message: string, secret: string, method: SignEncodeMethod, algorithm: SignAlgorithm, pemEncodeMethod?: SignEncodeMethod): Promise<string>;
export declare function checkWebCryptoAPISupported(): void;