So, after looking briefly into the continuous integration tool fastlane, which is not unique to the React Native ecosystem, let's take a look at an absolute must have tool for your React Native app: Microsoft CodePush.
CodePush is a service that allows us to update our JavaScript bundle and images in our already deployed React Native app. This means that you can change your UI/UX, fix potential bugs, and introduce new features without going through deployment and review processes in both stores. The fact CodePush gives you this ability is due to the fact that the React Native app consists of bundled JavaScript served over the bridge. This means that, potentially, we can update this bundle over the network.
The limitations of CodePush are that we can do instant updates only with JavaScript code and assets...