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In versions before 0.61 of react-native for reflecting code changes, we have two options.
but in the version 0.61, removing these two (Live Reload, Hot Reload) there is been a new developer feature introduced named Fast Refresh which also works similar to Hot Reload so now the question is what is the fundamental difference between Fast Refresh and Hot Reload.
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The difference between the two is, Live Reloading is gonna reload your entire application. It's just gonna be like, okay, the file changed, reload the entire app. Hot Reloading is not gonna reload your entire application. It's just going to patch the code that was changed and keep the state in your app.
Fast Refresh is a React Native feature that allows you to get near-instant feedback for changes in your React components. Fast Refresh is enabled by default, and you can toggle "Enable Fast Refresh" in the React Native developer menu. With Fast Refresh enabled, most edits should be visible within a second or two.
React Native solves this problem for the developers. Hot reloading allows you to see the changes that you have made in the code without reloading your entire app. Whenever you make any changes, all you need to do is save your code.
What does Hot Reload do? The idea behind Hot Reload is simple – while your application is running, you can make changes to the code and apply them to the running application. No recompilation is needed, and when possible, the state of your application is kept intact.
The “hot reloading” feature was broken. It didn’t work reliably for function components, often failed to update the screen, and wasn’t resilient to typos and mistakes. They heard that most people turned it off because it was too unreliable.
In React Native 0.61, they’re unifying the existing “live reloading” (reload on save) and “hot reloading” features into a single new feature called “Fast Refresh”. Fast Refresh was implemented from scratch with the following principles:
Read more from the official docs
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