o comando npm start não está a funcionar

Esse é o meu package.json

{
  "name": "alurabank",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "compile": "tsc",
    "start": "tsc -w"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "typescript": "^2.3.2"
  }
}

Aparece esse erro

C:\Users\User\OneDrive\Documentos\alurabank>npm start

> alurabank@1.0.0 start C:\Users\User\OneDrive\Documentos\alurabank
> tsc -w

'tsc' is not recognized as an internal or external command,
operable program or batch file.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! alurabank@1.0.0 start: `tsc -w`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the alurabank@1.0.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\User\AppData\Roaming\npm-cache\_logs\2020-12-18T13_21_18_371Z-debug.log

Ajudem-me por favor!