[firestore] .settings() - use hasOwnProperty instead of truthy value existence checks

lib/modules/firestore/index.js

@@ -15,7 +15,7 @@ import Path from './Path';
 import WriteBatch from './WriteBatch';
 import TransactionHandler from './TransactionHandler';
 import Transaction from './Transaction';
-import { isBoolean, isObject, isString } from '../../utils';
+import { isBoolean, isObject, isString, hop } from '../../utils';
 import { getNativeModule } from '../../utils/native';
 
 import type DocumentSnapshot from './DocumentSnapshot';
@@ -164,22 +164,25 @@ export default class Firestore extends ModuleBase {
       return Promise.reject(
         new Error('Firestore.settings failed: settings must be an object.')
       );
-    } else if (settings.host && !isString(settings.host)) {
+    } else if (hop(settings, 'host') && !isString(settings.host)) {
       return Promise.reject(
         new Error('Firestore.settings failed: settings.host must be a string.')
       );
-    } else if (settings.persistence && !isBoolean(settings.persistence)) {
+    } else if (
+      hop(settings, 'persistence') &&
+      !isBoolean(settings.persistence)
+    ) {
       return Promise.reject(
         new Error(
           'Firestore.settings failed: settings.persistence must be boolean.'
         )
       );
-    } else if (settings.ssl && !isBoolean(settings.ssl)) {
+    } else if (hop(settings, 'ssl') && !isBoolean(settings.ssl)) {
       return Promise.reject(
         new Error('Firestore.settings failed: settings.ssl must be boolean.')
       );
     } else if (
-      settings.timestampsInSnapshots &&
+      hop(settings, 'timestampsInSnapshots') &&
       !isBoolean(settings.timestampsInSnapshots)
     ) {
       return Promise.reject(

lib/utils/index.js

@@ -11,6 +11,15 @@ const AUTO_ID_CHARS =
 const { hasOwnProperty } = Object;
 
 // const DEFAULT_CHUNK_SIZE = 50;
+/**
+ * Checks for property existence by name on the specified object
+ * @param object
+ * @param property
+ * @returns {*}
+ */
+export function hop(object: Object, property: string): boolean {
+  return hasOwnProperty.call(object, property);
+}
 
 /**
  * Deep get a value from an object.