main repo

node_modules/framer-motion/dist/es/projection/styles/scale-box-shadow.mjs

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+import { complex, mixNumber } from 'motion-dom';
+
+const correctBoxShadow = {
+    correct: (latest, { treeScale, projectionDelta }) => {
+        const original = latest;
+        const shadow = complex.parse(latest);
+        // TODO: Doesn't support multiple shadows
+        if (shadow.length > 5)
+            return original;
+        const template = complex.createTransformer(latest);
+        const offset = typeof shadow[0] !== "number" ? 1 : 0;
+        // Calculate the overall context scale
+        const xScale = projectionDelta.x.scale * treeScale.x;
+        const yScale = projectionDelta.y.scale * treeScale.y;
+        shadow[0 + offset] /= xScale;
+        shadow[1 + offset] /= yScale;
+        /**
+         * Ideally we'd correct x and y scales individually, but because blur and
+         * spread apply to both we have to take a scale average and apply that instead.
+         * We could potentially improve the outcome of this by incorporating the ratio between
+         * the two scales.
+         */
+        const averageScale = mixNumber(xScale, yScale, 0.5);
+        // Blur
+        if (typeof shadow[2 + offset] === "number")
+            shadow[2 + offset] /= averageScale;
+        // Spread
+        if (typeof shadow[3 + offset] === "number")
+            shadow[3 + offset] /= averageScale;
+        return template(shadow);
+    },
+};
+
+export { correctBoxShadow };