angular-forms

Included with Lifetime

$97 forever

Build typed reactive forms with strict FormGroup typing, custom validators, and nonNullable controls in Angular. Use when implementing typed reactive forms, custom validators, or form control patterns.

General

What this skill does

# Forms

## **Priority: P2 (MEDIUM)**

## 1. Use Strictly Typed Reactive Forms

- Always use Reactive Forms over Template-Driven for complex inputs.
- Define typed `FormGroup<T>` with explicit control types — never use untyped FormGroup.

See [typed forms](references/typed-forms.md) for typed FormGroup examples.

## 2. Extract Validation Logic

- Create standalone validator functions in separate file.
- Sync `valueChanges` to stores using `takeUntilDestroyed()`.

See [typed forms](references/typed-forms.md) for standalone validator examples.

## 3. Ensure NonNullable Controls

- Use `fb.nonNullable.group(...)` or `nonNullable: true` on individual controls.
- This ensures form values always strings — avoids null in form values.

## Anti-Patterns

- **No Template-Driven Forms**: Use Reactive Forms for any non-trivial inputs.
- **No untyped FormGroup**: Always use strictly typed `FormGroup<T>`.
- **No validation in component**: Extract into standalone validator functions.

## References

- [Typed Forms](references/typed-forms.md)

Files: 3

Size: 5.2 KB

Complexity: 24/100

Category: General

Source: https://github.com/hoangnguyen0403/agent-skills-standard/tree/main/skills/angular/angular-forms

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