Moved class to seperate file and fixed some ts warnings

packages/frontend/src/scripts/favicon-dot.ts

@@ -0,0 +1,75 @@
+class FavIconDot {
+	canvas : HTMLCanvasElement;
+	src : string | null = null;
+	ctx : CanvasRenderingContext2D | null = null;
+	favconImage : HTMLImageElement | null = null;
+	faviconEL : HTMLLinkElement;
+	hasLoaded : Promise<void>;
+
+	constructor() {
+		this.canvas = document.createElement('canvas');
+		this.faviconEL = document.querySelector<HTMLLinkElement>('link[rel$=icon]') ?? this._createFaviconElem();
+
+		this.src = this.faviconEL.getAttribute('href');
+		this.ctx = this.canvas.getContext('2d');
+		
+		this.favconImage = document.createElement('img');
+		this.hasLoaded = new Promise((resolve, _reject) => {
+			if (this.favconImage != null) {
+				this.favconImage.onload = () => {
+					this.canvas.width = (this.favconImage as HTMLImageElement).width;
+					this.canvas.height = (this.favconImage as HTMLImageElement).height;
+					// resolve();
+					setTimeout(() => resolve(), 200);
+				};
+			}
+		});
+		this.favconImage.src = this.faviconEL.href;
+	}
+
+	private _createFaviconElem() {
+		const newLink = document.createElement('link');
+		newLink.rel = 'icon';
+		newLink.href = '/favicon.ico';
+		document.head.appendChild(newLink);
+		return newLink;
+	}
+
+	private _drawIcon() {
+		if (!this.ctx || !this.favconImage) return;
+		this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
+		this.ctx.drawImage(this.favconImage, 0, 0, this.favconImage.width, this.favconImage.height);
+	}
+
+	private _drawDot() {
+		if (!this.ctx || !this.favconImage) return;
+		this.ctx.beginPath();
+		this.ctx.arc(this.favconImage.width - 10, 10, 10, 0, 2 * Math.PI);
+		this.ctx.fillStyle = getComputedStyle(document.documentElement).getPropertyValue('--navIndicator');
+		this.ctx.strokeStyle = 'white';
+		this.ctx.fill();
+		this.ctx.stroke();
+	}
+
+	private _setFavicon() {
+		this.faviconEL.href = this.canvas.toDataURL('image/png');
+	}
+
+	async setVisible(isVisible : boolean) {
+		//Wait for it to have loaded the icon
+		await this.hasLoaded;
+		console.log(this.hasLoaded);
+		this._drawIcon();
+		if (isVisible) this._drawDot();
+		this._setFavicon();
+	}
+}
+
+let icon: FavIconDot = new FavIconDot();
+
+export function setFavIconDot(visible: boolean) {
+	if (!icon) {
+		icon = new FavIconDot();
+	}
+	icon.setVisible(visible);
+}