fix: eslinit errors

src/App.vue

@@ -101,12 +101,17 @@ function newImage() {
 
 function download() {
     const link = document.createElement("a");
-    link.download = `coverify-${new Date().getTime()}.png`;
+    link.download = `coverify-${new Date().getTime().toString()}.png`;
     link.href = canvas.value?.toDataURL() ?? "#";
     link.click();
 }
 
-function applyFilter(f: Filter, r: number, g: number, b: number): [number, number, number] {
+function applyFilter(
+    f: Filter,
+    r: number,
+    g: number,
+    b: number,
+): [number, number, number] {
     switch (f) {
         case Filter.Gray:
             const gray = 0.21 * r + 0.72 * g + 0.07 * b;
@@ -147,11 +152,12 @@ function draw() {
         targetSize.value,
         targetSize.value,
     );
-    const pixelData = imageData.data;
+    // @ts-expect-error: safer to cast
+    const pixelData = imageData.data as number[];
     for (let i = 0; i < pixelData.length; i += 4) {
-        const r1 = (pixelData[i] as number);
+        const r1 = pixelData[i];
-        const g1 = (pixelData[i + 1] as number);
+        const g1 = pixelData[i + 1];
-        const b1 = (pixelData[i + 2] as number);
+        const b1 = pixelData[i + 2];
 
         const [r2, g2, b2] = applyFilter(filter.value, r1, g1, b1);