angular-directives

Reusable Angular directives encapsulate DOM behavior across attribute, host, and structural directives using @Directive decorators with selectors. You implement the behavior with Angular's directive APIs like ElementRef and TemplateRef, then apply them to templates for consistent DOM enhancements.

Attribute directives modify element appearance and behavior, structural directives handle dynamic insertion points and portals using TemplateRef, and host directives compose reusable behaviors onto components. The Directive Composition API combines multiple directives on a single element.

No external dependencies are required to build Angular directives. You only need Angular's standard directive APIs including Directive, TemplateRef, ViewContainerRef, and ElementRef, along with standard tooling for Angular v20+ projects.

The Directive Composition API combines multiple directives on a single element or component in Angular. Host directives specifically compose reusable behaviors onto components, preventing duplicated directive logic across your UI libraries and feature modules.

Structural directives in Angular create portals, overlays, and dynamic insertion points. They leverage TemplateRef and ViewContainerRef APIs to manage where and how template content renders, extending DOM behavior for complex UI patterns.

Extract component logic into reusable Angular directives when projects duplicate DOM behavior across components. This structured approach ensures consistent DOM enhancements across UI libraries, component kits, and feature modules without rewriting logic.