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TypeScript/JavaScript standards for type-safe, maintainable code.

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SKILL.md

name typescript
description TypeScript/JavaScript standards for type-safe, maintainable code.

TypeScript/JavaScript Standards

Type Safety

  • Use strict TypeScript, never use any
  • Almost never use as casting
  • Aim for e2e type-safety (API to Database to UI)
  • Let the compiler infer response types whenever possible
  • Use query-builders instead of raw SQL for type-safety and injection protection

Code Structure

  • Always use named exports; avoid default exports unless required
  • Don't create index files only for exports
  • Prefer await/async over Promise().then()
  • Prefer types over interfaces
  • Leave types close to where they're used
  • Unused vars should start with _ (or don't exist at all)

Naming & Clarity

  • Don't abbreviate; use descriptive names
  • Always use early return over if-else
  • Prefer hash-lists over switch-case
  • Follow conventions: SNAKE_CAPS for constants, camelCase for functions, kebab-case for files
  • Avoid indentation levels, strive for flat code
  • Prefer string literals over string concatenation

Avoid

  • Redundant names: users not userList
  • Suffixes like Manager, Helper, Service unless essential
  • Over-long names: retryCount over maximumNumberOfTimesToRetryBeforeGivingUpOnTheRequest
  • Magic strings/numbers: extract to named constants or enums

Tooling

  • Use pre-commit hooks for linting/parsing/removing dead code