flow like the river

BACK_BACK/node_modules/graphql/jsutils/mapValue.js.flow

@@ -0,0 +1,20 @@
+// @flow strict
+import objectEntries from '../polyfills/objectEntries';
+
+import type { ObjMap } from './ObjMap';
+
+/**
+ * Creates an object map with the same keys as `map` and values generated by
+ * running each value of `map` thru `fn`.
+ */
+export default function mapValue<T, V>(
+  map: ObjMap<T>,
+  fn: (value: T, key: string) => V,
+): ObjMap<V> {
+  const result = Object.create(null);
+
+  for (const [key, value] of objectEntries(map)) {
+    result[key] = fn(value, key);
+  }
+  return result;
+}