remove side effect imports (#3534)

* remove side effect imports

* registerFirestore before test

Author: Feiyang1

packages/firestore/exp/index.ts

@@ -15,7 +15,9 @@
  * limitations under the License.
  */
 
-import './register';
+import { registerFirestore } from './register';
+
+registerFirestore();
 
 export { FieldPath, documentId } from '../lite/src/api/field_path';
 

packages/firestore/exp/register.ts

@@ -37,5 +37,3 @@ export function registerFirestore(): void {
   );
   registerVersion('firestore-exp', version, 'node');
 }
-
-registerFirestore();

packages/firestore/exp/test/bootstrap.ts

@@ -15,8 +15,8 @@
  * limitations under the License.
  */
 
-import '../register';
-
+import { registerFirestore } from '../register';
+registerFirestore();
 /**
  * This will include all of the test files and compile them as needed
  *

packages/firestore/lite/index.ts

@@ -15,7 +15,9 @@
  * limitations under the License.
  */
 
-import './register';
+import { registerFirestore } from './register';
+
+registerFirestore();
 
 export {
   Firestore as FirebaseFirestore,

packages/firestore/lite/register.ts

@@ -37,5 +37,3 @@ export function registerFirestore(): void {
   );
   registerVersion('firestore-lite', version, 'node');
 }
-
-registerFirestore();

packages/firestore/lite/test/bootstrap.ts

@@ -15,8 +15,8 @@
  * limitations under the License.
  */
 
-import '../register';
-
+import { registerFirestore } from '../register';
+registerFirestore();
 /**
  * This will include all of the test files and compile them as needed
  *