# Javascript Tooling

> Development tools, linting, and testing for JavaScript projects. Use when this capability is needed.

- Skill: `tomevault-io/javascript-tooling` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/javascript-tooling`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/javascript-tooling/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/javascript-tooling

---


# JavaScript Tooling

## **Priority: P1 (OPERATIONAL)**

Essential tooling for JavaScript development.

## Implementation Guidelines

- **Linting**: ESLint (Rec + Prettier). Fix on save.
- **Formatting**: Prettier. Run on save/commit.
- **Testing**: Jest/Vitest. Co-locate tests. >80% cov.
- **Build**: Vite (Apps), Rollup (Libs).
- **Pkg Manager**: Sync versions (`npm`/`yarn`/`pnpm`).

## Anti-Patterns

- **No Formatting Wars**: Prettier rules.
- **No Untested Code**: TDD/Post-code tests.
- **No Dirty Commits**: Lint before push.

## Configuration

```javascript
// .eslintrc.js
module.exports = {
  extends: ['eslint:recommended', 'prettier'],
  rules: { 'no-console': 'warn', 'prefer-const': 'error' },
};
```

```json
// .prettierrc
{ "semi": true, "singleQuote": true, "printWidth": 80 }
```

```javascript
// jest.config.js
export default {
  coverageThreshold: { global: { lines: 80 } },
};
```

## Reference & Examples

For testing patterns and CI/CD:
See [references/REFERENCE.md](references/REFERENCE.md).

## Related Topics

best-practices | language

---
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<!-- tomevault:4.0:skill_md:2026-04-11 -->