Yoooo, types in React is actually pretty damn simple! Check it:

type Props = {
  label: string;
  disabled?: boolean;
  onClick: (event: React.MouseEvent<HTMLDivElement, MouseEvent>) => void;
  style?: React.CSSProperties;
}

function MyButton (props: Props) {
  ..
}

Or

type Props = {
  label: string;
  startEnabled?: boolean;
  disabled?: boolean;
  onChange: (enabled: boolean) => void;
  style?: React.CSSProperties;
}

type State = {
  enabled: boolean;
}

class MyToggle extends React.Component<Props, State> {
  constructor (props: Props) {
    super(props);

    this.state = {
      enabled: !!props.startEnabled
    }
 }

 ...
}

90% of the time, the key to finding the right type is hovering over a prop in the JSX.

Obviously it can get more complicated than the above. For example, using generics in your props and writing out HOC. But for 90% of your components, it really is just going to be that simple.