More protobufjs migration

ts/util/dropNull.ts

@@ -1,5 +1,10 @@
 // Copyright 2021 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only
+/* eslint-disable no-restricted-syntax */
+
+export type NullToUndefined<T> = Extract<T, null> extends never
+  ? T
+  : Exclude<T, null> | undefined;
 
 export function dropNull<T>(
   value: NonNullable<T> | null | undefined
@@ -9,3 +14,25 @@ export function dropNull<T>(
   }
   return value;
 }
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+export function shallowDropNull<O extends { [key: string]: any }>(
+  value: O | null | undefined
+):
+  | {
+      [Property in keyof O]: NullToUndefined<O[Property]>;
+    }
+  | undefined {
+  if (value === null || value === undefined) {
+    return undefined;
+  }
+
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const result: any = {};
+
+  for (const [key, propertyValue] of Object.entries(value)) {
+    result[key] = dropNull(propertyValue);
+  }
+
+  return result;
+}