JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://unpkg.com/wpe-lightning@1.10.0/dist/lightning.js"></script>
<div id="app"></div>

JavaScript

class RoundedRectExample extends lng.Application {
  static _template() {
    return {
      Base: {
        rtt: true,
        w: 300,
        h: 300,
        Inner: {
          shader: {
            type: lng.shaders.RoundedRectangle,
            radius: 50
          },
          src: "https://image.shutterstock.com/image-vector/example-signlabel-features-speech-bubble-260nw-1223219848.jpg",
        },
      }
    }
  }
  _init() {
    const inner = this.tag('Inner');
    const anim = inner.animation({
      duration: 1,
      repeat: -1,
      actions: [
        {p: 'shader.radius', v: (p) => [50 * Math.cos(p * 2 * 3.14), 50, 100 * Math.cos((p - 0.5) * 2 * 3.14), 50]},
      ]
    }).start();
  
  }
}

const options = {
  stage: {
    w: 900,
    h: 900,
    clearColor: 0xFF000000,
    canvas2d: false,
    useImageWorker: false
  },
  debug: true
}
const app = new RoundedRectExample(options);
document.body.appendChild(app.stage.getCanvas());