export interface TokenBucketOptions {
    /**
     * Maximum number of tokens to hold in the bucket
     *
     * @type {number}
     */
    capacity: number;
    /**
     * Number of tokens to fill the bucket over the course of an interval
     *
     * @type {number}
     */
    fillRate: number;
}
/**
 * Token Bucket Algorithm used in network throttling.
 *
 * See https://en.wikipedia.org/wiki/Token_bucket for more information
 */
export declare class TokenBucket {
    capacity: number;
    fillRate: number;
    tokens: number;
    private time;
    constructor(options: TokenBucketOptions);
    /**
   * Consume N tokens from the bucket.
   *
   * If there is no capacity, the tokens are not pulled from the bucket.
   *
   * @param {Number} tokens the number of tokens to remove.
   * @return {Boolean} True if there were enough tokens, otherwise false.
   */
    consume(tokens: number): boolean;
    /**
     * Fills the bucket with more tokens.
     *
     * @return {Number} the current number of tokens in the bucket
     */
    private fill();
}