Cannot find name 'fetch'

If you are using Typescript 2.8.0+ fetch is included in the standard lib.

You will need to use "--lib dom" or add "dom" in your tsconfig.json:

1. old ❌

{
  "compilerOptions": {
    "lib": ["dom"],
  }
}

2. new ✅

{
  "compilerOptions": {
    "lib": ["DOM"],
  }
}

You most likely will need the typescript typings for fetch, just try

npm install --save-dev @types/whatwg-fetch

should sort out the error your getting.