Template Compiler

controllers.application\.js

import Ember from 'ember';
import Controller from '@ember/controller';
import { action } from '@ember/object';
import { tracked } from '@glimmer/tracking';
import { htmlSafe } from '@ember/template';

const { precompile } = Ember.__loader.require('ember-template-compiler')

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
	
	@tracked
	output = '';

  @action
  compileTemplate(e) {
    const template = JSON.parse(precompile(e.target.value));
    template.block = JSON.parse(template.block);
    const output = JSON.stringify(template, null, 2); 
    this.output = htmlSafe(output);
  }
}

styles.app\.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

textarea {
  font-size: 16px;
  width: 100%;
  min-height: 100px;
}

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
<br>
<textarea {{on "input" this.compileTemplate}}></textarea>
<pre>{{this.output}}</pre>
<br>
<br>

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",
    "ember-on-modifier": "1.0.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}