---
name: angular-forms-bb494ab19e20
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.
metadata:
  triggers:
    keywords:
    - FormBuilder
    - FormGroup
    - FormControl
    - Validators
    - reactive forms
    - typed forms
---
# Forms

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

## 1. Use Strictly Typed Reactive Forms

- Prefer Reactive Forms to 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.
- Name the validator module as a separate file (for example, `validators.ts`) in the response and keep validation out of the component class.
- 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)

## Canonical response anchors

- Additional task-grounded exact anchors: separate file


---
Source attribution: HoangNguyen0403
Original project: https://github.com/HoangNguyen0403/agent-skills-standard
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Copyright (c) 2026 Gabriel Moreira

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Mega AI Hub resource metadata

Creator / publisher: HoangNguyen0403
Original project: https://github.com/HoangNguyen0403/agent-skills-standard
Attribution basis: Upstream repository explicitly recorded in package mirror path

Fields of work: Design, Development & Engineering
Roles: Frontend Developer, Full-Stack Developer, UX Designer
Specialties: Cross Platform, Frontend
Tools: Angular
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: 6ff5cdce53fe008d222baaaa14337bba71c1f9d5ecbc1f4414bda0a937c4cf05