# Typescript > TypeScript/JavaScript standards for type-safe, maintainable code. Use when this capability is needed. - Skill: `tomevault-io/typescript-4` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/typescript-4` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/typescript-4/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/typescript-4 --- # 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 --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/x-tri) — claim your Tome and manage your conversions.