Interface Pipe

packages/core/src/metadata/directives.ts:728–753

 * @publicApi
 */
export interface Pipe {
  /**
   * The pipe name to use in template bindings.
   * Typically uses lowerCamelCase
   * because the name cannot contain hyphens.
   */
  name: string;

  /**
   * When true, the pipe is pure, meaning that the
   * `transform()` method is invoked only when its input arguments
   * change. Pipes are pure by default.
   *
   * If the pipe has internal state (that is, the result
   * depends on state other than its arguments), set `pure` to false.
   * In this case, the pipe is invoked on each change-detection cycle,
   * even if the arguments have not changed.
   */
  pure?: boolean;

  /**
   * Angular pipes marked as `standalone` do not need to be declared in an NgModule. Such
   * pipes don't depend on any "intermediate context" of an NgModule (ex. configured providers).
   */
  standalone?: boolean;
}

/**
 * @Annotation