LanguageSAFE

A collection of Agent Skills Standard and Best Practice for Programming Languages, Frameworks that help our AI Agent follow best practies on frameworks and programming laguages

The instruction file, verbatim from the audited commit — this is the text the model reads, and the surface the audit's instruction layer examines. Quoted here so you can judge it without cloning anything.

---
name: JavaScript Language Patterns
description: Modern JavaScript (ES2022+) patterns for clean, maintainable code.
metadata:
  labels: [javascript, language, es6, modern-js]
  triggers:
    files: ['**/*.js', '**/*.mjs', '**/*.cjs']
    keywords:
      [const, let, arrow, async, await, promise, destructuring, spread, class]
---

# JavaScript Language Patterns

## **Priority: P0 (CRITICAL)**

Modern JavaScript standards for clean, maintainable code.

## 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

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

// Async
async function getUser(id) {
  try {
    const res = await fetch(`/api/${id}`);
    return res.json();
  } catch (err) {
    console.error(err);
    throw err;
  }
}

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

## Reference & Examples

For advanced patterns and functional programming:
See [references/REFERENCE.md](references/REFERENCE.md).

## Related Topics

best-practices | tooling

SAFEgrade B · trust 89/100 Nothing in the source contradicts what it says it does. Grade A is reserved for packages that have also passed the behavioural sandbox.

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Gates applied: no_behavioural_pass.