Exclude node_modules from “problems”

I stumbled upon this issue as well.
The only solution I found was add the skipLibCheck option and set it to true in the compilerOptions of my tsconfig.json:

{
    "compilerOptions": {
        "skipLibCheck": true
    }
}

According to the doc, it will skip type checking of all declaration files (*.d.ts), which were the ones throwing the warnings in my case.