import { EffectCallback, InjectorDeps } from '../types/index';
/**
 * Runs a deferred side effect. This is just like React's `useEffect`. When
 * `deps` change on a subsequent reevaluation, the previous effect will be
 * cleaned up and the effect will rerun.
 *
 * Return a cleanup function to clean up resources when the effect reruns or the
 * current atom instance is destroyed.
 *
 * Unlike `useEffect`, you can return a promise from `injectEffect` (e.g. by
 * passing an async function). This is only for convenience in cases where you
 * don't have anything to cleanup, as you'll be unable to clean up resources if
 * you return a promise.
 */
export declare const injectEffect: (effect: EffectCallback, deps?: InjectorDeps, config?: {
    synchronous?: boolean | undefined;
} | undefined) => any;