Angular Output
Angular Output is a decorator-based API in the Angular framework that allows child components to emit custom events to parent components, enabling one-way data flow from child to parent. It uses the @Output() decorator along with EventEmitter to create and trigger events that can pass data. This mechanism is fundamental for component communication in Angular applications, particularly in parent-child component hierarchies.
Developers should use Angular Output when building reusable components that need to notify parent components about user interactions or internal state changes, such as button clicks, form submissions, or data updates. It is essential for creating decoupled, maintainable component architectures where child components emit events without directly modifying parent state, following Angular's unidirectional data flow principles. Common use cases include custom form controls, modal dialogs, and interactive UI elements that require feedback to parent components.