export default class Signature {
    /**
     * Instantiates a new Signature object.
     * @param {string} partnerID - Smile Partner ID. This is a unique identifier
     * for your Smile account.
     * @param {string} apiKey - Smile API Key. Found in the Smile Dashboard.
     */
    partnerID: string;
    apiKey: string;
    constructor(partnerID: string, apiKey: string);
    /**
     * Generates a signature for a given timestamp.
     * @param {string|number|undefined} timestamp - A valid ISO 8601 timestamp or unix time in
     * milliseconds. If undefined, the current time will be used.
     * @returns {{
     *  signature: string,
     *  timestamp: number,
     * }} - An object containing the signature and timestamp.
     * @throws {Error} - If the timestamp is invalid.
     */
    generate_signature(timestamp?: string | number): {
        signature: string;
        timestamp: number | string;
    };
    confirm_signature(timestamp: string | number, signature: string): boolean;
}