Implement _.pick to simplify serialization (#763)

Simplify the serialization code, so that we only write each prop once.

src/utils/object.ts

@@ -3,3 +3,20 @@ export function omitBy<T extends object>(obj: T, predicate: (value: any) => bool
     Object.entries(obj).filter(([_key, value]) => !predicate(value)),
   ) as Partial<T>
 }
+
+/**
+ * Creates an object composed of the picked object properties.
+ * Similar to lodash's pick function.
+ * @param obj The source object
+ * @param keys The property names to pick
+ * @returns A new object with just the picked properties
+ */
+export function pick<T extends object, K extends keyof T>(obj: T, keys: K[]): Pick<T, K> {
+  // eslint-disable-next-line unicorn/no-array-reduce
+  return keys.reduce((result, key) => {
+    if (key in obj) {
+      result[key] = obj[key]
+    }
+    return result
+  }, {} as Pick<T, K>)
+}