/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.dev/license
 */
/**
 * Function that can be used to manually clean up a
 * programmatic {@link OutputRef#subscribe} subscription.
 *
 * Note: Angular will automatically clean up subscriptions
 * when the directive/component of the output is destroyed.
 *
 * @see [Subscribing to outputs programmatically](guide/components/outputs#subscribing-to-outputs-programmatically)
 *
 * @publicAPI
 */
export interface OutputRefSubscription {
    unsubscribe(): void;
}
/**
 * A reference to an Angular output.
 *
 * @publicAPI
 * @see [Subscribing to outputs programmatically](guide/components/outputs#subscribing-to-outputs-programmatically)
 */
export interface OutputRef<T> {
    /**
     * Registers a callback that is invoked whenever the output
     * emits a new value of type `T`.
     *
     * Angular will automatically clean up the subscription when
     * the directive/component of the output is destroyed.
     */
    subscribe(callback: (value: T) => void): OutputRefSubscription;
}