Claude-skill-registry JavaScript Language Patterns

Modern JavaScript (ES2022+) patterns for clean, maintainable code.

install

source · Clone the upstream repo

git clone https://github.com/majiayu000/claude-skill-registry

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/majiayu000/claude-skill-registry "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/data/language" ~/.claude/skills/majiayu000-claude-skill-registry-javascript-language-patterns && rm -rf "$T"

manifest: skills/data/language/SKILL.md

JavaScript Language Patterns

Priority: P0 (CRITICAL)

Implementation Guidelines

Variables:
```
const
```
default.
```
let
```
if needed. No
```
var
```
.
Functions: Arrows for callbacks. Declarations for top-level.
Async:
```
async/await
```
+
```
try/catch
```
.
Objects: Destructuring, Spread
```
...
```
, Optional Chain
```
?.
```
, Nullish
```
??
```
.
Strings: Template literals
```
${}
```
.
Arrays:
```
map
```
,
```
filter
```
,
```
reduce
```
. No loops.
Modules: ESM
```
import
```
/
```
export
```
. Export only what is necessary.
Classes: Use
```
#private
```
fields for true privacy.

Anti-Patterns

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

Code

// Modern Syntax
const [x, ...rest] = items;
const name = user?.profile?.name ?? 'Guest';

// Async + Error Handling
async function getUser(id) {
  const res = await fetch(`/api/${id}`);
  return res.json(); // Errors propagate
}

// Private Fields
class Service {
  #key;
  constructor(k) {
    this.#key = k;
  }
}

Reference & Examples

For advanced patterns and functional programming: See references/REFERENCE.md.