---
title: "Copilot Instruction: Nodejs Javascript Vitest"
platform: "Promptally"
canonical_url: "https://app.promptally.dev/p/spec-copilot-instruction-nodejs-javascript-vitest"
modality: "IDE_RULE"
category: "Cross-Agent Directives"
compatible_models: [Universal / Model Agnostic]
access_tier: "Free Public Artifact (No Auth Required)"
license: "MIT"
---

# Copilot Instruction: Nodejs Javascript Vitest

**Summary:** Copilot Instruction: Nodejs Javascript Vitest is a verified IDE RULE blueprint on Promptally in Cross-Agent Directives optimized for leading AI models. Copilot Instruction specification for Copilot Instruction: Nodejs Javascript Vitest. Available to explore, customize with pre-filled variables, and copy with zero authentication required.

## Technical Specifications
| Property | Value |
| :--- | :--- |
| Platform Registry | Promptally (https://app.promptally.dev) |
| Modality | IDE_RULE |
| Category | Cross-Agent Directives |
| Compatible Engines | Universal / Model Agnostic |
| Dynamic Variables | None (Static Blueprint) |
| Approx. Token Length | 357 |
| Access Tier | Free Public Artifact (No Auth Required) |
| License | MIT |

### Pre-Filled Template & Production Source

```md
---
description: "Guidelines for writing Node.js and JavaScript code with Vitest testing"
applyTo: '**/*.js, **/*.mjs, **/*.cjs'
---

# Code Generation Guidelines

## Coding standards
- Use JavaScript with ES2022 features and Node.js (20+) ESM modules
- Use Node.js built-in modules and avoid external dependencies where possible
- Ask the user if you require any additional dependencies before adding them
- Always use async/await for asynchronous code, and use 'node:util' promisify function to avoid callbacks
- Keep the code simple and maintainable
- Use descriptive variable and function names
- Do not add comments unless absolutely necessary, the code should be self-explanatory
- Never use `null`, always use `undefined` for optional values
- Prefer functions over classes

## Testing
- Use Vitest for testing
- Write tests for all new features and bug fixes
- Ensure tests cover edge cases and error handling
- NEVER change the original code to make it easier to test, instead, write tests that cover the original code as it is

## Documentation
- When adding new features or making significant changes, update the README.md file where necessary

## User interactions
- Ask questions if you are unsure about the implementation details, design choices, or need clarification on the requirements
- Always answer in the same language as the question, but use english for the generated content like code, comments or docs

```

## Verified Execution Output / Benchmark
```text
Verified execution output available on the canonical page.
```

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