/// <reference types="node" />
export interface Platform {
    /**
     * Signs an arbitrary string using the provided algorithm and key, and returns the
     * base64 urlencoded buffer
     *
     * @param algo the algorithm to use when signing
     * @param key the signing key to use
     * @param value the value to sign
     */
    sign(algo: string, key: string | Buffer, value: string): string;
}