add new status to docs

Author: geof90

CodePush.js

@@ -191,7 +191,7 @@ const sync = (() => {
 
   return (options = {}, syncStatusChangeCallback, downloadProgressCallback) => {
     if (syncInProgress) {
-      typeof syncStatusChangeCallback == "function"
+      typeof syncStatusChangeCallback === "function"
         ? syncStatusChangeCallback(CodePush.SyncStatus.SYNC_IN_PROGRESS)
         : log("Sync already in progress.");
       return Promise.resolve(CodePush.SyncStatus.SYNC_IN_PROGRESS);
@@ -228,7 +228,7 @@ async function syncInternal(options = {}, syncStatusChangeCallback, downloadProg
     ...options 
   };
 
-  syncStatusChangeCallback = typeof syncStatusChangeCallback == "function"
+  syncStatusChangeCallback = typeof syncStatusChangeCallback === "function"
     ? syncStatusChangeCallback
     : (syncStatus) => {
         switch(syncStatus) {
@@ -267,7 +267,7 @@ async function syncInternal(options = {}, syncStatusChangeCallback, downloadProg
         }
       };
 
-  downloadProgressCallback = typeof downloadProgressCallback == "function" 
+  downloadProgressCallback = typeof downloadProgressCallback === "function" 
     ? downloadProgressCallback 
     : (downloadProgress) => {
         log(`Expecting ${downloadProgress.totalBytes} bytes, received ${downloadProgress.receivedBytes} bytes.`);

README.md

@@ -554,7 +554,7 @@ This method returns a `Promise` which is resolved to a `SyncStatus` code that in
 
 * __codePush.SyncStatus.UPDATE_INSTALLED__ *(6)* - The update has been installed and will be run either immediately after the `syncStatusChangedCallback` function returns or the next time the app resumes/restarts, depending on the `InstallMode` specified in `SyncOptions`.
 
-If the update check and/or the subsequent download fails for any reason, the `Promise` object returned by `sync` will be rejected with the reason.
+* __codePush.SyncStatus.SYNC_IN_PROGRESS *(7)* - There is an ongoing `sync` operation running which prevents the current call from being executed.
 
 The `sync` method can be called anywhere you'd like to check for an update. That could be in the `componentWillMount` lifecycle event of your root component, the onPress handler of a `<TouchableHighlight>` component, in the callback of a periodic timer, or whatever else makes sense for your needs. Just like the `checkForUpdate` method, it will perform the network request to check for an update in the background, so it won't impact your UI thread and/or JavaScript thread's responsiveness.
 
@@ -622,6 +622,7 @@ This enum is provided to the `syncStatusChangedCallback` function that can be pa
 * __codePush.SyncStatus.UP_TO_DATE__ *(4)* - The app is fully up-to-date with the configured deployment.
 * __codePush.SyncStatus.UPDATE_IGNORED__ *(5)* - The app has an optional update, which the end user chose to ignore. (This is only applicable when the `updateDialog` is used)
 * __codePush.SyncStatus.UPDATE_INSTALLED__ *(6)* - An available update has been installed and will be run either immediately after the `syncStatusChangedCallback` function returns or the next time the app resumes/restarts, depending on the `InstallMode` specified in `SyncOptions`.
+* __codePush.SyncStatus.SYNC_IN_PROGRESS *(7)* - There is an ongoing `sync` operation running which prevents the current call from being executed.
 * __codePush.SyncStatus.UNKNOWN_ERROR__ *(-1)* - The sync operation encountered an unknown error. 
 
 ### Objective-C API Reference (iOS)