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Events with correct scope in TypeScript
class Tracker {
count = 0;
constructor() {
window.addEventListener("mousedown", this.mouseDown);
window.addEventListener("mouseup", this.mouseUp);
mouseDown = (ev: MouseEvent) => {
window.addEventListener("mousemove", this.mouseMove);
mouseUp = (ev: MouseEvent) => {
window.removeEventListener("mousemove", this.mouseMove);
mouseMove = (ev: MouseEvent) => {
new Tracker();
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