Stencil Web Component Example

index.css

* {
  font-size: 200%;
}

span {
  width: 4rem;
  display: inline-block;
  text-align: center;
}

button {
  width: 64px;
  height: 64px;
  border: none;
  border-radius: 10px;
  background-color: seagreen;
  color: white;
}

index.tsx

/* @jsx h */
import { h, Component, State, Host } from "@stencil/core";

@Component({
  tag: "my-counter",
  styleUrl: "index.css",
  shadow: true
})
export class MyCounter {
  @State() count: number = 0;

  inc() {
    this.count++;
  }

  dec() {
    this.count--;
  }

  render() {
    return (
      <Host>
        <button onClick={this.dec.bind(this)}>-</button>
        <span>{this.count}</span>
        <button onClick={this.inc.bind(this)}>+</button>
      </Host>
    );
  }
}