Extending Form.io Core Components

extended.js

import {TextFieldComponent} from 'formiojs/build/components/textfield/TextField';
import Components from 'formiojs/build/components/index';
export class ExtendedTextField extends TextFieldComponent {
  constructor(component, options, data) {
    super(component, options, data);
  }

  createInput(container) {
    let input = super.createInput(container);
    if (this.component.custom.listen) {
      input.addEventListener('change', () => {
      
      });
    }
    return input;
  }
}

// Override the core component to render this instead.
Components.textfield = ExtendedTextField;