New Twiddle

components.main-component\.js

import Component from '@glimmer/component';

export default class extends Component {
  constructor(owner, args) {
    super(owner, args);
    this.passedArgs = args;

    // if (this.args.displayMode === 'list') {
    //   this.items = [];
    // }
  }
  
  @action
  initAttributes(){
  	this.passedArgs = args;
  }
}

components.my-component-1\.js

import Component from '@glimmer/component';

export default class extends Component {
  constructor(owner, args) {
    super(owner, args);
		this.passedArgs = args.passedArgs;
  }
}

components.my-component-2\.js

import Component from '@glimmer/component';

export default class extends Component {
  constructor(owner, args) {
    super(owner, args);
		this.passedArgs = args.passedArgs;
  }
}

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
}

templates.application\.hbs

<h1>Welcome to 
<Input value={{this.text}} type="text" /></h1>
<br>
<br>
<MainComponent @someParam={{this.text}}/>

<br>
<br>

templates.components.main-component\.hbs

yes, I am the main component loading other components dynamically
<br>
<br>
{{component "my-component-1" passedArgs=this.passedArgs}}

templates.components.my-component-1\.hbs

Yes, I am my-component-1

{{@passedArgs.someParam}}
<br>
<br>
{{component "my-component-2" passedArgs=this.passedArgs}}

templates.components.my-component-2\.hbs

Yes, I am my-component-2

{{@passedArgs.someParam}}

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"
  }
}