JavaScript

Modern JS/TS patterns for ES2020+ with async code, safe property access, modern syntax.

When to Use

Use when:

• Writing JavaScript with ES2020+ features
• Refactoring legacy JS to modern syntax
• Implementing async operations (promises, async/await)
• Using destructuring, optional chaining, nullish coalescing

Don't use for TypeScript (typescript skill), React (react skill), or Node.js backend.

Critical Patterns