declare module Tracker {
  function Computation(): void;
  interface Computation {
    firstRun: boolean;
    invalidate(): void;
    invalidated: boolean;
    onInvalidate(callback: Function): void;
    onStop(callback: Function): void;
    stop(): void;
    stopped: boolean;
  }
  var currentComputation: Computation;

  var Dependency: DependencyStatic;
  interface DependencyStatic {
    new (): Dependency;
  }
  interface Dependency {
    changed(): void;
    depend(fromComputation?: Computation): boolean;
    hasDependents(): boolean;
  }

  var active: boolean;
  function afterFlush(callback: Function): void;
  function autorun(runFunc: (computation: Computation) => void, options?: {
    onError?: Function;
  }): Computation;
  function flush(): void;
  function nonreactive(func: Function): void;
  function onInvalidate(callback: Function): void;
}