New Twiddle

components.fancy-list\.js

import Component from '@glimmer/component';

export default class extends Component {
  @tracked
  _nextId = 0;

  @tracked
  _patches: Patch[] = [];

  get defaultHyperItem() {
    return createHyperItem();
  }

  get hyperItem() {
    return {
      ...this.defaultHyperItem,
      items: this.patchItems(),
    };
  }

  addItem = () => {
    const id = `id-${this._nextId++}`;

    window.console.log('add-item', id);

    this._patches = [...this._patches, { id, action: 'add-item', value: randomValue() }];
  };

  updateItem = () => {
    const index = Math.round(Math.random() * (this._nextId - 1));
    const id = `id-${index}`;

    window.console.log('update-item', index, id);

    this._patches = [...this._patches, { id, action: 'update-item', value: randomValue() }];
  };

  clearItems = () => {
    this._patches = [];
    this._nextId = 0;
  };

  addAndUpdateItem = () => {
    this.addItem();
    this.updateItem();
  };

  patchItems() {
    return this._patches.reduce((items, patch) => {
      return applyPatch(items, patch);
    }, []);
  }
}

controllers.application\.js

import Controller from '@ember/controller';

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

templates.application\.hbs

<FancyList />

templates.components.fancy-list\.hbs

Fancy List

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"
  }
}