constants.ts

/**
 * @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.io/license
 */

/**
 * The strategy that the default change detector uses to detect changes.
 * When set, takes effect the next time change detection is triggered.
 *
 * @see [Change detection usage](/api/core/ChangeDetectorRef?tab=usage-notes)
 * @see [Skipping component subtrees](/best-practices/skipping-subtrees)
 *
 * @publicApi
 */
export enum ChangeDetectionStrategy {
  /**
   * Use the `CheckOnce` strategy, meaning that automatic change detection is deactivated
   * until reactivated by setting the strategy to `Default` (`CheckAlways`).
   * Change detection can still be explicitly invoked.
   * This strategy applies to all child directives and cannot be overridden.
   */
  OnPush = 0,

  /**
   * Use the default `CheckAlways` strategy, in which change detection is automatic until
   * explicitly deactivated.
   */
  Default = 1,
}