Convert checkForUpdate to return a promise

Author: Will Anderson

CodePush.ios.js

@@ -48,20 +48,27 @@ var getSdk = (() => {
 })();
 
 function checkForUpdate(callback) {
-  getConfiguration().then(function(configuration) {
-    getSdk.then(function(sdk) {
-      NativeCodePush.getLocalPackage(function(err, localPackage) {
-        var queryPackage = {appVersion: configuration.appVersion};
-        if (!err && localPackage && localPackage.appVersion === configuration.appVersion) {
-          queryPackage = localPackage;
-        } else if (err) {
-          console.log(err);
-        }
+  var config;
+  var sdk;
+  return getConfiguration()
+    .then((configResult) => {
+      config = configResult;
+      return getSdk();
+    })
+    .then((sdkResult) => {
+      sdk = sdkResult;
+      return NativeCodePush.getLocalPackage();
+    })
+    .then((localPackage) => {
+      var queryPackage = {appVersion: config.appVersion};
+      if (localPackage && localPackage.appVersion === config.appVersion) {
+        queryPackage = localPackage;
+      } else if (err) {
+        console.log(err);
+      }
 
-        sdk.queryUpdateWithCurrentPackage(queryPackage, callback);
-      });
+      sdk.queryUpdateWithCurrentPackage(queryPackage, callback);
     });
-  });
 }
 
 function download(updatePackage) {

CodePush.m

@@ -189,7 +189,8 @@ + (void) loadBundle:(NSString*)rootComponent
 }
 
 
-RCT_EXPORT_METHOD(getLocalPackage: (RCTResponseSenderBlock)callback)
+RCT_EXPORT_METHOD(getLocalPackage:(RCTPromiseResolveBlock)resolve
+                  rejecter:(RCTPromiseRejectBlock)reject)
 {
 
     NSString *path = [CodePush getPackagePath];
@@ -199,17 +200,17 @@ + (void) loadBundle:(NSString*)rootComponent
         NSError* readError;
         NSString *content = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:&readError];
         if (readError) {
-            callback(@[RCTMakeError(@"Error finding local package ", readError, [[NSDictionary alloc] initWithObjectsAndKeys:path,@"packagePath", nil]), [NSNull null]]);
+            reject(readError);
         } else {
             NSError * parseError;
             NSData *data = [content dataUsingEncoding:NSUTF8StringEncoding];
             NSDictionary* json = [NSJSONSerialization JSONObjectWithData:data
                                                                  options:kNilOptions
                                                                    error:&parseError];
             if (parseError) {
-                callback(@[RCTMakeError(@"Error parsing contents of local package ", parseError, [[NSDictionary alloc] initWithObjectsAndKeys:path,@"packagePath", nil]), [NSNull null]]);
+                reject(parseError);
             } else {
-                callback(@[[NSNull null], json]);
+                resolve(json);
             }
         }
     });

Examples/CodePushDemoApp/index.ios.js

@@ -22,7 +22,7 @@ var CodePushDemoApp = React.createClass({
     this.fetchData();
   },
   fetchData: function() {
-    CodePush.checkForUpdate((err, update) => {
+    CodePush.checkForUpdate().done((update) => {
       this.setState({ update: update });
     });
   },