initial cleanup

src/routes/weather/canvas/cloud-cover.ts

@@ -2,7 +2,7 @@ export default (
 	ctx: CanvasRenderingContext2D | null | undefined,
 	config: ConfigInterface,
 	series: Float32Array | null | undefined,
-	canvasElement: HTMLCanvasElement | null
+	canvasElement: HTMLCanvasElement
 ): void => {
 	if (ctx && series) {
 		ctx.beginPath();
@@ -41,7 +41,7 @@ export default (
 		);
 
 		// same series but reversed
-		for (const [ind, v] of series.entries()) {
+		for (const [ind, _v] of series.entries()) {
 			const index = series.length - 1 - ind;
 			const value = series[index];
 			const nextValue = series[index - 1];