Node.js

1. Create a new npm project

   1. Create a new directory and cd into it

   2. Initialize a new npm project

      npm init
      

2. Install ts-node and typescript

   npm i ts-node typescript
   

3. Create tsconfig.json

   npx --package=typescript tsc --init
   

   • If you forget this step, you may get weird TypeScript errors, such as

     Cannot find name 'require'.
     

4. Update package.json

   • Update references to files with .js extensions, e.g.

     "main": "app.ts"
     

     (Even if this is a fresh TypeScript project, you may have references to .js files depending on how you used npm init)

   • Update anything in scripts using node to use ts-node, e.g.

     From:

     "start": "node ."
     

     To:

     "start": "ts-node ."
     

Troubleshooting

Cannot find module '...' or its corresponding type declarations.

If you’re using TypeScript with Node.js:

1. Make sure you have the Node types package installed:

   npm i --save-dev @types/node
   

2. If you still get the error and you don’t have a tsconfig.json file, generate one:

   npx -p typescript tsc --init