import type { ReactiveController, ReactiveControllerHost } from "./ReactiveController.ts";
/**
 * Creates a reactive controller that can react to the host's lifecycle events.
 *
 * @beta This API is in beta and may change in future releases.
 */
export declare function createEffect<H extends ReactiveControllerHost>(host: H, setup: Effect.Setup<H>): Effect;
export type Effect = ReactiveController & {
    /**
     * Sets up the effect
     *
     * @remarks
     *
     * This is typically called when the host is connected.
     */
    setup(): void;
    /**
     * Tears down the effect
     *
     * @remarks
     *
     * This is typically called when the host is disconnected.
     */
    teardown(): void;
    /**
     * Disposes of the effect, tearing it down and preventing
     * it from be **automatically** set up again.
     *
     * @remarks
     *
     * This should be called when the effect is no longer needed.
     */
    dispose(): void;
};
export declare namespace Effect {
    type Teardown<H> = (host: H) => void;
    type Setup<H> = (host: H) => Teardown<H> | void;
}
export { createEffect as effect, };
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