Flow Promise This type is incompatible with undefined undefined

Question

Flow Promise This type is incompatible with undefined undefined

Get a warning enter image description here

in line:

enter image description here

Use Flow.js v.0.48.0. Sample code:

...
import { Font, AppLoading } from 'expo';
...
export default class App extends Component {
  async componentDidMount() {
    await Font.loadAsync(fontsStore);
    ...
  }
  ...
}

+3

react-native expo exponent flowtype

Bohdan pomohaibo June 18 17 at 4:29

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2 answers

Bohdan pomohaibo · Answer 1 · 2017-06-18T04:49:20+0000

Found solution for the hack:

...
  componentDidMount() {
    this.loadFonts();
  }

  async loadFonts () {
    await Font.loadAsync(fontsStore);

    this.setState({ fontLoaded: true });
  }
...

Run code

hcatlin · Answer 2 · 2017-07-03T22:47:36+0000

Async is for losers ... it's a promise, so just implement then

and head out to dinner. :)

  componentDidMount () {
    Font.loadAsync({
      'open-sans-bold': require('./assets/fonts/OpenSans-Bold.ttf'),
    }).then(() => this.setState({fontLoaded: true}))
  }

Run code

Flow Promise This type is incompatible with undefined undefined

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