FormInput Example

components.form-input\.js

import Component from '@glimmer/component';
import { action } from '@ember/object';

export default class extends Component {
  
  @action
  inputValueChanged(e) {
  	const val = "POKEMON = " + e.target.value;
    
    
    // Logic
    
    if(val.length > 10) {
      this.args.onChange(val);
    }
    }
}

controllers.application\.js

import Controller from '@ember/controller';
import { action } from '@ember/object';

export default class ApplicationController extends Controller {
  appValue = 'Swaraj';

	@action
	componentValueChanged(newValue) {
  	console.log(`component value was changed : ${newValue}`);
  }
}

templates.application\.hbs

My value: {{this.appValue}}

<br>
<br>
<br>

<FormInput
	@abc={{this.appValue}}
  @onChange={{this.componentValueChanged}}
/>

templates.components.form-input\.hbs

<Input
	@value={{@abc}}
  {{on "input" this.inputValueChanged}}
/>

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}