Resolve async issue for authorization code flow

README.md

@@ -222,6 +222,41 @@ In the config include these parameters:
 	token: "https://auth.dataporten.no/oauth/token",
 ```
 
+To resolve async issue after authorization, use `then()` method to return a Promise:
+
+```
+client.callback().then(callback => {
+    let token = null;
+    
+    if (callback) {
+      token = callback;
+      console.log('I got the token', token);
+
+    } else {
+      client.getToken().then(tokenFromStore => {
+        token = tokenFromStore;
+        console.log('I got the token', token);
+      });
+    }
+  });
+```
+
+You can use async function and the `await` keyword:
+```
+async function MyFunction() {
+  let token = null;
+  const callback = await client.callback();
+
+  if (callback) {
+    token = callback;
+  } else {
+    token = await client.getToken();
+  }
+
+  console.log('I got the token', token);
+}
+```
+
 Also be aware that the implementation of this flow uses `fetch`, to support older browser you would need to polyfill that.
 
 

src/JSO.js

@@ -295,7 +295,10 @@ class JSO extends EventEmitter {
 
 		} else if (response.hasOwnProperty("error")) {
 			throw this.processErrorResponse(response)
-		}
+
+    } else if (this.config.has('token')) {
+      return Promise.resolve()
+    }
 
 	}