something is working

node_modules/mongodb/src/operations/collections.ts

@@ -0,0 +1,48 @@
+import { Collection } from '../collection';
+import type { Db } from '../db';
+import type { Server } from '../sdam/server';
+import type { ClientSession } from '../sessions';
+import type { Callback } from '../utils';
+import { AbstractOperation, OperationOptions } from './operation';
+
+export interface CollectionsOptions extends OperationOptions {
+  nameOnly?: boolean;
+}
+
+/** @internal */
+export class CollectionsOperation extends AbstractOperation<Collection[]> {
+  override options: CollectionsOptions;
+  db: Db;
+
+  constructor(db: Db, options: CollectionsOptions) {
+    super(options);
+    this.options = options;
+    this.db = db;
+  }
+
+  override execute(
+    server: Server,
+    session: ClientSession | undefined,
+    callback: Callback<Collection[]>
+  ): void {
+    const db = this.db;
+
+    // Let's get the collection names
+    db.listCollections(
+      {},
+      { ...this.options, nameOnly: true, readPreference: this.readPreference, session }
+    ).toArray((err, documents) => {
+      if (err || !documents) return callback(err);
+      // Filter collections removing any illegal ones
+      documents = documents.filter(doc => doc.name.indexOf('$') === -1);
+
+      // Return the collection objects
+      callback(
+        undefined,
+        documents.map(d => {
+          return new Collection(db, d.name, db.s.options);
+        })
+      );
+    });
+  }
+}