Revert file fully

Author: DellaBitta

packages/database/src/api/Database.ts

@@ -27,7 +27,6 @@ import { Provider } from '@firebase/component';
 import {
   getModularInstance,
   createMockUserToken,
-  // deepEqual,
   EmulatorMockTokenOptions,
   getDefaultEmulatorHostnameAndPort
 } from '@firebase/util';
@@ -85,11 +84,12 @@ let useRestClient = false;
  */
 function repoManagerApplyEmulatorSettings(
   repo: Repo,
-  hostAndPort: string,
+  host: string,
+  port: number,
   tokenProvider?: AuthTokenProvider
 ): void {
   repo.repoInfo_ = new RepoInfo(
-    hostAndPort,
+    `${host}:${port}`,
     /* secure= */ false,
     repo.repoInfo_.namespace,
     repo.repoInfo_.webSocketOnly,
@@ -350,22 +350,13 @@ export function connectDatabaseEmulator(
 ): void {
   db = getModularInstance(db);
   db._checkNotDeleted('useEmulator');
-  const hostAndPort = `${host}:${port}`;
-  const repo = db._repoInternal;
   if (db._instanceStarted) {
-    // If the instance has already been started, then silenty fail if this function is called again
-    // with the same parameters. If the parameters differ then assert.
-    if (
-      hostAndPort === db._repoInternal.repoInfo_.host //&&
-      //deepEqual(options, repo.repoInfo_.emulatorOptions)
-    ) {
-      return;
-    }
     fatal(
-      'connectDatabaseEmulator() cannot alter the emulator configuration after the database instance has started.'
+      'Cannot call useEmulator() after instance has already been initialized.'
     );
   }
 
+  const repo = db._repoInternal;
   let tokenProvider: EmulatorTokenProvider | undefined = undefined;
   if (repo.repoInfo_.nodeAdmin) {
     if (options.mockUserToken) {
@@ -383,7 +374,7 @@ export function connectDatabaseEmulator(
   }
 
   // Modify the repo to apply emulator settings
-  repoManagerApplyEmulatorSettings(repo, hostAndPort, tokenProvider);
+  repoManagerApplyEmulatorSettings(repo, host, port, tokenProvider);
 }
 
 /**