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What is Metro in React-Native?
Metro is a well-accepted Java script bundler with many options, including an entry file that provides you with a Java script file along with all the previous files.
Let us look at the functionalities of the metro bundler and how it has been supporting the react native framework -
How Does Metro Help in React Native Development?
One essential feature of the metro is the sub-second reload cycles. This feature adds and debugs the app UIs in a matter of seconds, where you usually don't have to wait for the app to restart and start working.
The second most useful feature of the metro application is providing a quick start-up to the apps and a fast-bundling speed.
Other key features are-
Metro has another unique feature that allows you to convert assets into objects you can portray through an image.
How Does Metro Work?
Let us now look at how metro goes through the bundling process. It has got three separate stages for it -
The second stage comprises all the modules going through a transformer. The function of the transformer is to convert the module in such a way and format that it becomes easily understandable for the target platform like react native. This transformation process is parallel based on the total number of available cores.
A step-wise guide to how Metro works
For the first step, let us look at app development through working with bundles in the metro.
However, it creates a good separation between the developer's box and the test machine, considering it is a mobile device.
Thus, it will give you an idea of slick the refresh has been working and if your app has probably accepted all the changes or not.
Producing Offline Bundles For A Release
If you want the bundle to be inserted directly into your application as a resource, then it can be done through an offline bundle. For creating an offline bundle, metro takes the initiative and produces a bundle considering it a part of your application.
However, the bundle is loaded directly through a user code as if there is no option for requesting through an HTTP server.
Debugging Through Web
Debugging Through Chrome
For this debugging method, you would use the tools available in chrome to carry out the debugging process. Whenever you decide to launch the metro, a new tab will navigate you to a specific URL from where you can carry out the process of debugging. Upon reaching there, you can click on the F12 button and start using the debugging tools there.
Debugging Using VS Code
To summarize everything, using metro would be a great way to use in react native platform through which you can execute many different tasks in a matter of seconds. Hopefully, after reading the above article, you now understand the role of the metro in building native applications.
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