Narrow content and children types

[martensm]

I believe #18 was merged too hastily. React.ReactNode isn't the correct type to use here because it disagrees with how propTypes are defined. Using React.ReactNode allows for invalid code such as this:

<>
  <Tippy content={null}>
    <div />
  </Tippy>
  <Tippy content="foo">
    {null}
  </Tippy>
</>

The second Tippy element here will fail at runtime.

[atomiks]

Thanks! Relying on the the community for this one because I'm not experienced with TypeScript to understand this myself

[martensm]

To clarify, the ReactNode type definition is a union type which has null and that's why null would be allowed in TypeScript if it was typed as ReactNode. If the propTypes were PropTypes.node instead of PropTypes.element then they would be equivalent but that's not the case here.