Fixed a typescript error

Author: lucacasonato

firestore/useCollection.ts

@@ -1,6 +1,7 @@
 import { firestore, FirebaseError } from 'firebase';
 import { useEffect } from 'react';
 import { useIsEqualRef, useLoadingValue } from '../util';
+import { transformError } from '../util/transformError';
 
 export type CollectionHook = {
   error?: FirebaseError;
@@ -24,13 +25,8 @@ export default (
         return;
       }
       const listener = options
-        ? ref.current.onSnapshot(options, setValue, (error: Error) => setError({
-          message: error.message,
-          stack: error.stack,
-          name: error.name,
-          code: ''
-        }))
-        : ref.current.onSnapshot(setValue, setError);
+        ? ref.current.onSnapshot(options, setValue, (error: Error) => setError(transformError(error)))
+        : ref.current.onSnapshot({}, setValue, (error: Error) => setError(transformError(error)));
 
       return () => {
         listener();

firestore/useDocument.ts

@@ -1,6 +1,7 @@
 import { firestore, FirebaseError } from 'firebase';
 import { useEffect } from 'react';
 import { useIsEqualRef, useLoadingValue } from '../util';
+import { transformError } from '../util/transformError';
 
 export type DocumentHook = {
   error?: FirebaseError;
@@ -24,13 +25,8 @@ export default (
         return;
       }
       const listener = options
-        ? ref.current.onSnapshot(options, setValue, (error: Error) => setError({
-          message: error.message,
-          stack: error.stack,
-          name: error.name,
-          code: ''
-        }))
-        : ref.current.onSnapshot(setValue, setError);
+        ? ref.current.onSnapshot(options, setValue, (error: Error) => setError(transformError(error)))
+        : ref.current.onSnapshot({}, setValue, (error: Error) => setError(transformError(error)));
 
       return () => {
         listener();

util/transformError.ts

@@ -0,0 +1,10 @@
+import { FirebaseError } from 'firebase';
+
+export const transformError = (error: Error): FirebaseError => {
+  return {
+    message: error.message,
+    stack: error.stack,
+    name: error.name,
+    code: ''
+  }
+}