chore: fix linting

lib/db.ts

@@ -1,5 +1,4 @@
 import * as firestore from '@google-cloud/firestore'
-import * as types from './types'
 import * as config from './config'
 
 export let db: firestore.Firestore = null
@@ -13,42 +12,3 @@ if (config.isPreviewImageSupportEnabled) {
 
   images = db.collection(config.firebaseCollectionImages)
 }
-
-async function get<T extends types.Model>(
-  doc: firestore.DocumentReference,
-  userId?: string
-): Promise<T> {
-  const snapshot = await doc.get()
-
-  if (snapshot.exists) {
-    const res = getSnapshot<T>(snapshot)
-
-    if (userId && res.userId && res.userId !== userId) {
-      throw {
-        message: 'Unauthorized',
-        status: 403
-      }
-    }
-
-    return res
-  }
-
-  throw {
-    message: 'Not found',
-    status: 404
-  }
-}
-
-function getSnapshot<T extends types.Model>(
-  snapshot: firestore.DocumentSnapshot<firestore.DocumentData>
-): T {
-  const data = snapshot.data()
-  delete data.timestamp
-
-  return {
-    ...data,
-    id: snapshot.id,
-    createdAt: (snapshot.createTime.toDate().getTime() / 1000) | 0,
-    updatedAt: (snapshot.updateTime.toDate().getTime() / 1000) | 0
-  } as T
-}