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‎.github/workflows/biome-check.yml‎

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name: Biome Lint and Format Check
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on:
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push:
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branches:
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- main
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pull_request:
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branches:
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- main
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jobs:
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biome_check:
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runs-on: ubuntu-latest
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steps:
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- name: ⬇️ Checkout Repository
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uses: actions/checkout@v4
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- name: ⚙️ Set up Node.js
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uses: actions/setup-node@v4
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with:
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node-version: '20'
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- name: 📦 Install Dependencies
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run: npm install
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- name: 📝 Run Biome Lint Check
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run: npm run biome:lint
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- name: 📏 Run Biome Format Check
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run: npm run biome:format

‎LICENSE‎

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MIT License
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Copyright (c) 2026 [Samuel Egbajie/CodePapi] <oshiesam@gmail.com>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎README.md‎

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```markdown
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# CodePapi AI ⚡
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**CodePapi AI** is a professional, privacy-focused developer utility that brings the power of LLMs to your local workflow. Translate code from any language to another, migrate frameworks, reviews codes, and debug logic—all without your data ever leaving your machine.
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![License](https://img.shields.io/badge/license-MIT-blue.svg)
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![Ollama](https://img.shields.io/badge/AI-Ollama-orange.svg)
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![React](https://img.shields.io/badge/Frontend-React-61DAFB.svg)
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![NestJS](https://img.shields.io/badge/Backend-NestJS-E0234E.svg)
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![Biome](https://img.shields.io/badge/Linter-Biome-60a5fa.svg)
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---
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## 📺 Demo
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https://github.com/user-attachments/assets/00000000-0000-0000-0000-000000000000
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---
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## ✨ Features
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- 🔄 **Smart Translation**: Seamlessly convert code between 10+ languages (Go, Rust, Python, TS, etc., flexible enough to support more languages).
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- 🚀 **Migration Engine**: Expert-level presets for:
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- React Class Components ➡️ Functional Components
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- JavaScript ➡️ TypeScript
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- CSS ➡️ Tailwind CSS
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- React ➡️ Vue
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- 🔍 **Deep Code Review**: AI-driven analysis of performance, security, and best practices.
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- 🐞 **Interactive Bug Fixer**: Side-by-side **Diff View** highlighting exactly what the AI changed to fix your logic.
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- 🔒 **Air-Gapped Privacy**: Powered by `phi3:mini` running locally via **Ollama**.
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---
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## 🚀 Quick Start
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### 1. Prerequisites
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- [Docker & Docker Compose](https://docs.docker.com/get-docker/)
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### 2. Setup & Installation
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```bash
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# Clone the repository
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git clone [https://github.com/yourusername/codepapi-ai.git](https://github.com/yourusername/codepapi-ai.git)
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cd codepapi-ai
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# Start the entire stack (AI + Backend + Frontend)
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docker-compose up -d
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```
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### 3. Usage
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* **Frontend**: Open [http://localhost](https://www.google.com/search?q=http://localhost)
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* **API**: Accessible at [http://localhost:3000](https://www.google.com/search?q=http://localhost:3000)
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*Note: The first startup pulls the Phi-3 Mini model (approx 2.3GB). Please ensure you have a stable internet connection.*
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---
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## 🛠 Tech Stack
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| Component | Technology |
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| --- | --- |
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| **AI Engine** | [Ollama](https://ollama.ai/) (phi3:mini) |
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| **Orchestration** | LangChain.js |
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| **Backend** | NestJS (Node.js) |
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| **Frontend** | React, TailwindCSS, Lucide |
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| **Editor** | Monaco Editor (VS Code Engine) |
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| **Tooling** | Biome (Linting & Formatting) |
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---
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## 🤝 Contributing
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We use **Biome** for lightning-fast linting and formatting. Please run the following before submitting a Pull Request:
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```bash
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# Check and apply fixes
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npx @biomejs/biome check --apply .
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```
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**Adding Languages:** To add new programming languages or migration presets used by the UI, see the frontend documentation: `frontend/README.md` (section "Adding More Languages"). Edit `frontend/src/constants/languages.ts` to add entries.
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## 📜 License
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Distributed under the MIT License. See `LICENSE` for more information.
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---
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Created with ❤️ by [Your Name]
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```
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---
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### 🔧 Step 4: The Biome Configuration (`biome.json`)
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Run `npx @biomejs/biome init` in your project root. It will create this file. Here is a solid configuration for your project:
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```json
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{
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"$schema": "https://biomejs.dev/schemas/1.8.3/schema.json",
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"organizeImports": {
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"enabled": true
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},
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"linter": {
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"enabled": true,
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"rules": {
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"recommended": true,
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"complexity": {
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"noForeach": "off"
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}
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}
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},
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"formatter": {
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"enabled": true,
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"indentStyle": "space",
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"indentWidth": 2,
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"lineWidth": 100
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}
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}
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```

‎backend/package.json‎

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{
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"name": "backend",
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"name": "codepapi-ai-backend",
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"description": "A backend for the CodePapi AI tool",
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"author": "Samuel Egbajie",
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"version": "0.0.1",
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"description": "",
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"author": "",
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"private": true,
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"license": "UNLICENSED",
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"scripts": {

‎backend/src/converter/converter.controller.ts‎

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import { Controller, Post, Body } from '@nestjs/common';
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import { Body, Controller, Post } from '@nestjs/common';
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import { ConverterService } from './converter.service';
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@Controller('converter')
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async fix(@Body() data: { code: string; lang: string }) {
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return this.converterService.fixBugs(data.code, data.lang);
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}
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}
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}

‎backend/src/converter/converter.module.ts‎

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import { Module } from '@nestjs/common';
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import { ConverterService } from './converter.service';
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import { ConverterController } from './converter.controller';
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import { ConverterService } from './converter.service';
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@Module({
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providers: [ConverterService],
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controllers: [ConverterController]
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controllers: [ConverterController],
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})
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export class ConverterModule {}

‎backend/src/converter/converter.service.ts‎

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import { Injectable, InternalServerErrorException } from '@nestjs/common';
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import { ChatOllama } from '@langchain/ollama';
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import { Injectable, InternalServerErrorException } from '@nestjs/common';
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@Injectable()
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export class ConverterService {
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constructor() {
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this.model = new ChatOllama({
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baseUrl: process.env.OLLAMA_URL || 'http://localhost:11434',
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model: 'qwen2.5-coder:1.5b',
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model: 'phi3:mini',
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});
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}
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// --- 1. CODE TRANSLATION ---
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async convertCode(code: string, from: string, to: string) {
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// Check if "to" is a migration preset
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const isMigration = to.includes('-') || from.includes('-');
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const prompt = `
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async convertCode(code: string, from: string, to: string) {
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// Check if "to" is a migration preset
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const isMigration = to.includes('-') || from.includes('-');
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const prompt = `
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You are an expert software architect specializing in ${isMigration ? 'code migration' : 'code translation'}.
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Task: Convert the input from ${from} to ${to}.
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${isMigration ? `
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${
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isMigration
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? `
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SPECIFIC INSTRUCTIONS FOR MIGRATION:
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- If moving from Class to Functional components, use React Hooks (useState, useEffect).
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- If moving to TypeScript, add proper interfaces and types.
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- If moving between frameworks (e.g., React to Vue), map lifecycle methods and state management accurately.
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` : ''}
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`
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: ''
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}
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RULES:
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- Return ONLY raw code.
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private async executeInvoke(prompt: string, key: string) {
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try {
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const response = await this.model.invoke(prompt);
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return {
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success: true,
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[key]: response.content
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return {
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success: true,
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[key]: response.content,
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};
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} catch (error) {
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console.error(`AI Service Error:`, error);
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console.error('AI Service Error:', error);
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throw new InternalServerErrorException('Failed to connect to AI engine');
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}
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}
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}
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}

‎backend/src/main.ts‎

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async function bootstrap() {
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const app = await NestFactory.create(AppModule);
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app.enableCors();
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await app.listen(process.env.PORT ?? 3000);
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}
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bootstrap();

‎backend/test/app.e2e-spec.ts‎

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import { Test, TestingModule } from '@nestjs/testing';
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import { INestApplication } from '@nestjs/common';
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import { Test, TestingModule } from '@nestjs/testing';
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import * as request from 'supertest';
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import { App } from 'supertest/types';
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import { AppModule } from './../src/app.module';

‎biome.json‎

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{
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"$schema": "https://biomejs.dev/schemas/1.9.4/schema.json",
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"vcs": { "enabled": false, "clientKind": "git", "useIgnoreFile": false },
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"files": {
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"include": ["src", "test"],
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"ignoreUnknown": false,
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"ignore": [
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"**/node_modules",
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"dist/**"
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]
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},
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"formatter": {
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"enabled": true,
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"useEditorconfig": true,
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"formatWithErrors": false,
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"indentStyle": "space",
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"indentWidth": 2,
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"lineEnding": "lf",
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"lineWidth": 80,
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"attributePosition": "auto",
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"bracketSpacing": true
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},
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"organizeImports": {
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"enabled": true
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},
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"linter": {
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"enabled": true,
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"rules": {
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"recommended": true,
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"style": {
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"useImportType": "off"
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},
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"complexity": {
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"noStaticOnlyClass": "off"
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}
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}
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},
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"javascript": {
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"parser": {
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"unsafeParameterDecoratorsEnabled": true
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},
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"formatter": {
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"jsxQuoteStyle": "double",
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"quoteProperties": "asNeeded",
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"trailingCommas": "all",
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"semicolons": "always",
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"arrowParentheses": "always",
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"bracketSameLine": false,
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"quoteStyle": "single",
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"attributePosition": "auto",
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"bracketSpacing": true
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}
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}
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}

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