Refactor script into separate modules

src/missing.ts

@@ -0,0 +1,15 @@
+import * as fs from "fs";
+import { REPO } from ".";
+import { Manifest } from "./manifest";
+import { WikiGameCache } from "./wiki";
+
+export function saveMissingGames(cache: WikiGameCache, manifest: Manifest): void {
+    fs.writeFileSync(
+        `${REPO}/data/missing.md`,
+        Object.entries(cache)
+            .sort((x, y) => x[0].localeCompare(y[0]))
+            .filter(([k, _]) => (manifest[k]?.files ?? []).length === 0 && (manifest[k]?.registry ?? []).length === 0)
+            .map(([k, v]) => `* [${k}](https://www.pcgamingwiki.com/wiki/?curid=${v.pageId})`)
+            .join("\n") + "\n",
+    );
+}