declare module DDPRateLimiter {
  interface Matcher {
    type?: string | ((type: string) => boolean);
    name?:  string | ((name: string) => boolean);
    userId?: string | ((userId: string) => boolean);
    connectionId?: string | ((connectionId: string) => boolean);
    clientAddress?: string | ((clientAddress: string) => boolean);
  }

  function addRule(matcher: Matcher, numRequests: number, timeInterval: number): string;

  function removeRule(ruleId: string): boolean;
}