How to call async component's internal function

[FallOutChonny]

I'm having a little problem.
Say I have an async component that is encapsulated with react-async-component, like this:

const AsyncComponent = asyncComponent({
  resolve: () => new Promise(resolve =>
    require.ensure([], require => {
      resolve(require('draft-js'))
    }
  )
})

then call its internal functions by refs

<AsyncComponent ref={c => this.editor = c} />

this.editor.focus();

but will get Uncaught TypeError: _this.editor.focus is not a function error, and I use console.log(this.editor) see it's a async component and has not focus function so that I can't access it.

I spent a lot of time but still have no idea how to fix it,
does anyone can help ? thanks 😄

[FallOutChonny]

Ok, finally I found the approach solved it,

in main component, pass a onRef prop to AsyncComponent

<AsyncComponent
  onRef={c => this.editor = c}
/>

in Async Component, return this

componentDidMount() {
  this.props.onRef(this);
}

then you can do like so from main component.

this.editor.clear();
this.editor.focus();