planning

node_modules/react-window/src/shallowDiffers.js

@@ -0,0 +1,17 @@
+// @flow
+
+// Pulled from react-compat
+// https://github.com/developit/preact-compat/blob/7c5de00e7c85e2ffd011bf3af02899b63f699d3a/src/index.js#L349
+export default function shallowDiffers(prev: Object, next: Object): boolean {
+  for (let attribute in prev) {
+    if (!(attribute in next)) {
+      return true;
+    }
+  }
+  for (let attribute in next) {
+    if (prev[attribute] !== next[attribute]) {
+      return true;
+    }
+  }
+  return false;
+}