---
name: "JavaScript Standards"
description: "Cross-project JavaScript and MJS standards for clarity, maintainability, and performance-aware code."
applyTo: "**/*.js,**/*.mjs"
---

- Prefer `const` over `let`, and avoid `var`.
- Use async/await for asynchronous flows.
- Keep modules focused and avoid monolithic files.
- Remove dead code and unused imports during related edits.
- Use early returns to reduce branching complexity.
- Keep behavior explicit; avoid implicit coercion and hidden side effects.
- Favor composition and reusable utilities over duplicated logic.
- Avoid deep nesting, callback-heavy control flow, and blocking sync work in user-facing paths.
- Validate with the project's JavaScript lint, test, and build commands.