1. yarn install --pure-lockfile
2. tsc
3. Why does it do this?

$ tsc
src/mycomponent.ts:5:14 - error TS2345: Argument of type 'typeof MyComponent2' is not assignable to parameter of type 'string'.

5     return h(MyComponent2, {})

4. Answer: because MyComponent isn't passing the required prop foo to MyComponent2. Change it to this and it will work:

export class MyComponent extends Component<{}, {}> {
  render() {
    return h(MyComponent2, {foo: 1})
  }
}