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 added them to the compilerOptions in tsconfig.json
{
//...
"compilerOptions": {
"types": [
"node"
]
},
}
That still didn’t solve so I dropped 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, first try restarting VS Code after adding the types).