Instructions for utilizing a non-string reference without triggering flow errors

I've noticed that string refs are considered legacy in React. You can read more about it here: https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-string-refs.md

However, I am encountering a flow error in my component and I'm unsure how to resolve it:

[flow] Cannot assign `c` to `this.loginform` because property `loginform` is missing in `LoginScreen` [1]. (References: [1])

This is the code snippet of my component:

/**
 * @flow
 */

// ... imports, tcomb form model, etcetera ...

class LoginScreen extends React.Component<*> {

  onPress() {
    var creds = this.loginform.getValue();
    orbRequestLogin(this.props.navigation, creds, '/oauth/token');
  }

  render() {
    return (
      <Wrap bgcolor="white">
        <Content>
          <KeyboardAvoidingView behavior="padding">
            <Form ref={(c) => { this.loginform = c; }} type={User} options={options} />

            <TouchableHighlight style={styles.button} onPress={this.onPress.bind(this)}>
              <Text style={styles.buttonText}>Log in</Text>
            </TouchableHighlight>

          </KeyboardAvoidingView>
        </Content>
      </Wrap>
    );
  }
}

export default withNavigation(LoginScreen);

Answer №1

It is important to include an annotation for the loginform in your class's body. See the example below:

class LoginScreen extends React.Component<*> {
    loginform: Form

You can learn more about this in the Class Fields section of the flow documentation.

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