loading spinner component's styles were excessively redundant

components/loading/Loading.tsx

@@ -1,49 +1,54 @@
 import { memo } from "react";
+import css from "styled-jsx/css";
 
 type Props = {
-  boxes?: number;
-  timing?: number;
-  width: number;
+  width: number; // of entire container, in pixels
+  boxes?: number; // total number of boxes (default: 3)
+  timing?: number; // staggered timing between each box's pulse, in seconds (default: 0.1s)
 };
 
-const Loading = ({ boxes = 3, timing = 0.1, width }: Props) => {
+const Loading = ({ width, boxes = 3, timing = 0.1 }: Props) => {
   // each box is just an empty div
   const divs = [];
 
+  // box styles (extracted here so they're not defined for each individual box)
+  const { className: boxClassName, styles: boxStyles } = css.resolve`
+    div {
+      display: inline-block;
+      width: ${width / (boxes + 1)}px;
+      height: 100%;
+      animation: loading 1.5s infinite ease-in-out both;
+      background-color: var(--medium-light);
+    }
+
+    @keyframes loading {
+      0%,
+      80%,
+      100% {
+        transform: scale(0);
+      }
+      40% {
+        transform: scale(0.6);
+      }
+    }
+  `;
+
   // allow a custom number of pulsing boxes (defaults to 3)
   for (let i = 0; i < boxes; i++) {
     // width of each box correlates with number of boxes (with a little padding)
     // each individual box's animation has a staggered start in corresponding order
     divs.push(
-      <div key={i}>
-        <style jsx>{`
-          div {
-            display: inline-block;
-            width: ${width / (boxes + 1)}px;
-            height: 100%;
-            animation: loading 1.5s infinite ease-in-out both;
-            animation-delay: ${i * timing}s;
-            background-color: var(--medium-light);
-          }
-
-          @keyframes loading {
-            0%,
-            80%,
-            100% {
-              transform: scale(0);
-            }
-            40% {
-              transform: scale(0.6);
-            }
-          }
-        `}</style>
-      </div>
+      <>
+        <div key={i} className={boxClassName} style={{ animationDelay: `${i * timing}s` }} />
+        {boxStyles}
+      </>
     );
   }
 
   return (
     <div>
       {divs}
+
       <style jsx>{`
         div {
           width: ${width}px;