Useful Grammar Tips / Snippets for TypeScript


I would like to share some useful snippets for TypeScript coding!

😀 Read-Only Class Properties

Cool!!!

class Circle {
  readonly radius: number;

  constructor(radius: number) {
    this.radius = radius;
  }

  get area() {
    return Math.PI * this.radius ** 2;
  }
}

😼 Type of HTMLElement

interface HTMLElementEventextends HTMLElement> extends Event {
    target: T;
}

var element = document.createElement('input');
element.addEventListener('click', function(event: HTMLElementEvent) {
    alert(event.target.value); // 補完できるﾔｯﾀｰ
}, false);
element.click();

🐹 References

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