Migrate scripts to ESM and ts-check

scripts/utils/optionalResources.mjs

@@ -0,0 +1,19 @@
+// Copyright 2024 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+// @ts-check
+import z from 'zod';
+
+export const OptionalResourceSchema = z.object({
+  digest: z.string(),
+  url: z.string(),
+  size: z.number(),
+});
+
+/** @typedef {z.infer<typeof OptionalResourceSchema>} OptionalResourceType */
+
+export const OptionalResourcesDictSchema = z.record(
+  z.string(),
+  OptionalResourceSchema
+);
+
+/** @typedef {z.infer<typeof OptionalResourcesDictSchema>} OptionalResourcesDictType */