Had this error (more a warning) in a project:

VS Code complained Node.js types could not be found.

So I installed them:

npm install -D @types/node

Then add them to the compilerOptions in tsconfig.json:

{
  //...
  "compilerOptions": {
    "types": [
      "node"
    ]
  },
}

That still didn’t solve it, so I removed node_modules:

rm -rf node_modules
rm -f package-lock.json
npm cache clean --force
npm install

Finally, restarting VS Code made them disappear (not sure if reinstalling modules had any effect—try restarting VS Code first after adding the types).

Lessons in this unit:

0:	Introduction
1:	▶︎ Fix Node.js imports types errors in VS Code
2:	referenceerror: window is not defined, how to solve
3:	Use the Chrome DevTools to debug a Node.js app
4:	Error handling in Node.js
5:	How to solve the `util.pump is not a function` error in Node.js