skills/ HoangNguyen0403/agent-skills-standard

angular-style-guide

Naming conventions, file structure, and coding standards for Angular projects. Use for Angular-specific naming and organization; defer language-only TypeScript naming questions.

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Angular Style Guide

Priority: P0 (CRITICAL)

Principles

  • Single Responsibility: 1 component/service per file. Functions < 75 lines.
  • Size Limits: Files < 400 lines. Refactor if larger.
  • Strict Naming: kebab-case with type suffix (e.g., hero-list.component.ts, auth.service.ts, user.pipe.ts, app.routes.ts).
  • Barrels: index.ts for public APIs only. No deep barrel imports within same feature — import directly. Wrong barrel placement breaks tree-shaking.
  • LIFT: Locate code quickly, Identify files by name, keep Flattest structure possible, Try to be DRY.

Naming Standards

  • Files: kebab-case.type.ts
  • Classes: PascalCase + type suffix (HeroListComponent, AuthService)
  • Directives: camelCase selector with app prefix (e.g., appHighlight)
  • Pipes: camelCase name (e.g., truncate)
  • Services: PascalCase + Service suffix (HeroService)
  • Interfaces: No — do not use IUser/IHero. Name as nouns: User, Hero. The I-prefix is not recommended by Angular style guide.

Folder Structure

  • Core: src/app/core/ (singletons and global state).
  • Shared: src/app/shared/ (reusable UI and pipes).
  • Features: src/app/features/ (lazy-loaded). Folder depth ≤ 3 levels — no deeper nesting.

Anti-Patterns

  • No logic in templates: Move to component class or computed() signal.
  • No deep nesting: Keep folder depth ≤3 levels.
  • No I-prefix on interfaces: Name interfaces User, not IUser.

References

Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:

  • app prefix,appHighlight,appFocusTrap
  • Flattest structure
  • do not use I,avoid the I-prefix,no I-prefix,do not prefix,No. Do not

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