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It should return an object to update the state, or null to update nothing.Note that this method is fired on is invoked immediately after a component is mounted.
A class component becomes an error boundary if it defines this lifecycle method.
Calling in it lets you capture an unhandled Java Script error in the below tree and display a fallback UI.
Take a look at Using React without ES6 to learn more.
Note that we don’t recommend creating your own base component classes.
The default behavior is to re-render on every state change, and in the vast majority of cases you should rely on the default behavior.