angular-20-control-flow

SKILL.md

Purpose This skill provides comprehensive guidance on Angular 20's built-in control flow syntax, which introduces new template syntax (@if, @for, @switch, @defer) that replaces structural directives with better performance, type safety, and developer experience.

| Syntax error with @ blocks | Ensure Angular 20+ and update compiler | | @for without track error | Always add track expression to @for | | @defer not lazy loading | Check bundle config and verify component is in separate chunk | | Type errors with @if | Use as alias for type narrowing |

| @empty not showing | Ensure collection signal returns empty array, not undefined |

Angular 20 built-in control flow syntax (@if, @for, @switch, @defer) for modern template programming. Use when writing templates with conditional rendering, loops, switch statements, or lazy loading components. Replaces *ngIf, *ngFor, *ngSwitch with new block syntax for better performance and type safety. Source: 7spade/black-tortoise.

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