Build

1. From the root of your repository, run npm init -y to create a new Node.js project.
2. Add TypeScript along with types for node, and tsx (TypeScript Execute) which will allow you to run TypeScript files directly in Node.js:

npm install -D typescript @types/node tsx

3. Configure TypeScript by creating a tsconfig.json file in the root of your project:

{
  "compilerOptions": {
    "baseUrl": ".",
    "target": "esnext",
    "module": "esnext",
    "rootDir": "./src",
    "outDir": "./dist",
    "strict": true,
    "moduleResolution": "Node",
    "esModuleInterop": true,
    "skipLibCheck": true
  },
  "include": ["./src/**/*.ts"],
  "exclude": ["node_modules"]
}

• include specifies the files to include in the compilation
• exclude specifies the files to exclude from the compilation
• strict enables all strict type checking options
• esModuleInterop allows you to use ES module syntax
• moduleResolution specifies how modules are resolved
• baseURL specifies the base directory for module resolution

4. Configure the package.json in the root of your project:
   • add "type":"module". This means we can use the ES module syntax in our project for imports and exports.
   • add a start script that runs tsx ./src/index.ts - this will run the CLI.

{
...
  "type": "module",
  "scripts": {
    "start": "tsx ./src/index.ts"
  },
...
}

5. Create a src directory - this is where your project's TypeScript code will live.
6. In src/index.ts, create a main() function:

function main() {
  console.log("Hello, world!");
}

main();

7. To pass off this step, from the root of your project, run:

npm run start

If you see "Hello, world!" printed in the console, you're good to go!

Submit the CLI tests.