refactor(ts/color): improve code style and change name of some variables for more clarity

assets/ts/color.ts

@@ -1,5 +1,5 @@
 interface colorScheme {
-    key: string,                        /// Regenerate color scheme when the image is changed
+    hash: string,                        /// Regenerate color scheme when the image hash is changed
     DarkMuted: {
         hex: string,
         rgb: Number[],
@@ -23,12 +23,22 @@ if (localStorage.hasOwnProperty('StackColorsCache')) {
     }
 }
 
-async function getColor(id: string, key: string, imageURL: string) {
-    if (!id || !colorsCache.hasOwnProperty(id) || colorsCache[id].key !== key) {
+async function getColor(key: string, hash: string, imageURL: string) {
+    if (!key) {
+        /**
+         * If no key is provided, do not cache the result
+         */
+        return await Vibrant.from(imageURL).getPalette();
+    }
+
+    if (!colorsCache.hasOwnProperty(key) || colorsCache[key].hash !== hash) {
+        /**
+         * If key is provided, but not found in cache, or the hash mismatches => Regenerate color scheme
+         */
         const palette = await Vibrant.from(imageURL).getPalette();
 
-        colorsCache[id] = {
-            key: key,
+        colorsCache[key] = {
+            hash: hash,
             Vibrant: {
                 hex: palette.Vibrant.hex,
                 rgb: palette.Vibrant.rgb,
@@ -41,10 +51,11 @@ async function getColor(id: string, key: string, imageURL: string) {
             }
         }
 
+        /* Save the result in localStorage */
         localStorage.setItem('StackColorsCache', JSON.stringify(colorsCache));
     }
 
-    return colorsCache[id];
+    return colorsCache[key];
 }
 
 export {