Format comments.

Author: yuchenshi

packages/firestore/src/api/credentials.ts

@@ -135,7 +135,10 @@ export class EmptyCredentialsProvider implements CredentialsProvider {
   }
 }
 
-/** A CredentialsProvider that always returns a constant token. Used for emulator token mocking. */
+/**
+ * A CredentialsProvider that always returns a constant token. Used for
+ * emulator token mocking.
+ */
 export class EmulatorCredentialsProvider implements CredentialsProvider {
   constructor(private token: Token) {}
 

packages/firestore/src/lite/database.ts

@@ -230,6 +230,8 @@ export function getFirestore(app: FirebaseApp = getApp()): FirebaseFirestore {
  * emulator.
  * @param host - the emulator host (ex: localhost).
  * @param port - the emulator port (ex: 9000).
+ * @param options.mockUserToken - the mock auth token to use for unit testing
+ * Security Rules.
  */
 export function useFirestoreEmulator(
   firestore: FirebaseFirestore,
@@ -256,7 +258,8 @@ export function useFirestoreEmulator(
   });
 
   if (options.mockUserToken) {
-    // Let createMockUserToken validate first (catches common mistakes like "uid" and missing sub.)
+    // Let createMockUserToken validate first (catches common mistakes like
+    // invalid field "uid" and missing field "sub" / "user_id".)
     const token = createMockUserToken(options.mockUserToken);
     const uid = options.mockUserToken.sub || options.mockUserToken.user_id;
     if (!uid) {