planning

node_modules/@react-dnd/shallowequal/src/index.ts

@@ -0,0 +1,55 @@
+export function shallowEqual<T>(
+  objA: T,
+  objB: T,
+  compare?: (a: T, b: T, key?: string) => boolean | void,
+  compareContext?: any
+) {
+  var compareResult = compare
+    ? compare.call(compareContext, objA, objB)
+    : void 0;
+  if (compareResult !== void 0) {
+    return !!compareResult;
+  }
+
+  if (objA === objB) {
+    return true;
+  }
+
+  if (typeof objA !== 'object' || !objA || typeof objB !== 'object' || !objB) {
+    return false;
+  }
+
+  var keysA = Object.keys(objA);
+  var keysB = Object.keys(objB);
+
+  if (keysA.length !== keysB.length) {
+    return false;
+  }
+
+  var bHasOwnProperty = Object.prototype.hasOwnProperty.bind(objB);
+
+  // Test for A's keys different from B.
+  for (var idx = 0; idx < keysA.length; idx++) {
+    var key = keysA[idx];
+
+    if (!bHasOwnProperty(key)) {
+      return false;
+    }
+
+    var valueA = (objA as any)[key];
+    var valueB = (objB as any)[key];
+
+    compareResult = compare
+      ? compare.call(compareContext, valueA, valueB, key)
+      : void 0;
+
+    if (
+      compareResult === false ||
+      (compareResult === void 0 && valueA !== valueB)
+    ) {
+      return false;
+    }
+  }
+
+  return true;
+}