fix list and improve cloud functions

functions/src/users.js

@@ -0,0 +1,36 @@
+const admin = require("firebase-admin");
+const { onDocumentDeleted } = require("firebase-functions/firestore");
+const { refList } = require("../index");
+const { deleteFolder } = require("../helpers/firebase");
+
+exports.onUserDelete = onDocumentDeleted("users/{userID}", async (event) => {
+  try {
+    const userID = event?.params?.userID;
+    await clearAllUserData(userID);
+
+    await deleteFolder(`users/${userID}/`);
+
+    await admin.auth().deleteUser(userID);
+    console.log(`User ${userID} deleted successfully`);
+  } catch (e) {
+    console.log(e);
+  }
+});
+
+async function clearAllUserData(userID) {
+  const deleteAll = async (ref, key, operator = "==") => {
+    const snapshot = await ref.where(key, operator, userID).get();
+    snapshot.forEach((item) => item.ref.delete());
+  };
+  const removeFromArray = async (ref, arrayName) => {
+    const snapshot = await ref.where(arrayName, "array-contains", userID).get();
+    snapshot.forEach((item) =>
+      item.ref.update({
+        [arrayName]: admin.firestore.FieldValue.arrayRemove(userID),
+      }),
+    );
+  };
+
+  await deleteAll(refList.projects, "userId");
+  await deleteAll(refList.playlists, "createdBy");
+}