Add Helper For Preparing a Record For Use in forkJoin

libs/common/src/platform/misc/convertValues.ts

@@ -0,0 +1,23 @@
+import { ObservableInput, OperatorFunction, map } from "rxjs";
+
+/**
+ * Converts a record of keys and values into a record preserving the original key and converting each value into an {@link ObservableInput}.
+ * @param project A function to project a given key and value pair into an {@link ObservableInput}
+ */
+export function convertValues<TKey extends PropertyKey, TInput, TOutput>(
+  project: (key: TKey, value: TInput) => ObservableInput<TOutput>,
+): OperatorFunction<Record<TKey, TInput>, Record<TKey, ObservableInput<TOutput>>> {
+  return map((inputRecord) => {
+    if (inputRecord == null) {
+      return null;
+    }
+
+    // Can't use TKey in here, have to use `PropertyKey`
+    const result: Record<PropertyKey, ObservableInput<TOutput>> = {};
+    for (const [key, value] of Object.entries(inputRecord) as [TKey, TInput][]) {
+      result[key] = project(key, value);
+    }
+
+    return result;
+  });
+}