TypeScript getting error TS2304: cannot find name ' require'

Question

I am trying to get my first TypeScript and DefinitelyTyped Node.js application up and running, and running into some errors.

I am getting the error \"TS2304: Cannot

Answer 1

1. Did you specify what module to use to transpile the code?
   tsc --target es5 --module commonjs script.ts
   You must do that to let the transpiler know that you're compiling NodeJS code. Docs.

2. You must install mongoose definitions as well
   tsd install mongoose --save

3. Do not use var to declare variables (unless necessary, which is a very rare case), use let instead. Learn more about that