feat: initial boilerplate

api/libraries/database/utilities.ts

@@ -0,0 +1,37 @@
+import type { Db } from "mongodb";
+import z, { ZodType } from "zod";
+
+/**
+ * Get a Set of collections that exists on a given mongo database instance.
+ *
+ * @param db - Mongo database to fetch collection list for.
+ */
+export async function getCollectionsSet(db: Db) {
+  return db
+    .listCollections()
+    .toArray()
+    .then((collections) => new Set(collections.map((c) => c.name)));
+}
+
+export function toParsedDocuments<TSchema extends ZodType>(
+  schema: TSchema,
+): (documents: unknown[]) => Promise<z.infer<TSchema>[]> {
+  return async function (documents: unknown[]) {
+    const parsed = [];
+    for (const document of documents) {
+      parsed.push(await schema.parseAsync(document));
+    }
+    return parsed;
+  };
+}
+
+export function toParsedDocument<TSchema extends ZodType>(
+  schema: TSchema,
+): (document?: unknown) => Promise<z.infer<TSchema> | undefined> {
+  return async function (document: unknown) {
+    if (document === undefined || document === null) {
+      return undefined;
+    }
+    return schema.parseAsync(document);
+  };
+}