skills/ HoangNguyen0403/agent-skills-standard

javascript-language

Modern JavaScript (ES2022+) patterns for clean, maintainable code. Use when working with modern JavaScript features like optional chaining, nullish coalescing, or ESM.

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SKILL.md

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JavaScript Language Patterns

Priority: P0 (CRITICAL)

Implementation Guidelines

  • Variables: const default. let if needed. No var — block scope only.
  • Functionality: Use Arrow Functions for callbacks/inlines; Function Declaration for core logic.
  • Async Logic: Use async/await with try/catch and Promise.all() for parallel operations. ESM import/export only. No Callbacks — promisify everything.
  • Modern Syntax: Use Destructuring, Spread (...), Optional Chain ?. and Nullish ?? coalescing.
  • String Handling: Use Template Literals (backticks) for interpolation and multi-line strings.
  • Data Collections: Prefer map, filter, and reduce over imperative for loops.
  • Modules: Standardize on ESM import/export; use Named Exports over Default.
  • Encapsulation: Leverage #private class fields for encapsulation.
  • Error States: Throw new Error() with descriptive messages; never throw strings.

Anti-Patterns

  • No var — Block scope only.
  • No ==: Strict ===.
  • No new Object(): Use literals {}.
  • No Callbacks: Promisify everything.
  • No Mutation: Immutability first.

Code & Reference

See references/REFERENCE.md for modern syntax, async patterns, private fields, and functional programming examples.

Related Topics

best-practices | tooling

Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:

  • ESM import/export

  • No Callbacks

  • No var

  • Nullish ??

  • Optional Chain ?.

  • async/await

  • const default

  • let if needed

  • user?.profile?.name

  • Additional task-grounded exact anchors: try/catch

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