Agent-Skills.md

Agent Skills: Forms

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. (triggers: FormBuilder, FormGroup, FormControl, Validators, reactive forms, typed forms)

UncategorizedID: hoangnguyen0403/agent-skills-standard/angular-forms

Repository

hoangnguyen0403/agent-skills-standard
HoangNguyen0403License: Apache-2.0
362103

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pnpm dlx add-skill https://github.com/HoangNguyen0403/agent-skills-standard/tree/HEAD/skills/angular/angular-forms

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skills/angular/angular-forms/SKILL.md

Skill Metadata

Name
angular-forms
Description
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.

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 for typed FormGroup examples.

2. Extract Validation Logic

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

See typed forms 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