Import Īs a result of this change, even if MyApp needs to re-render, the components calling useContext(AuthContext) won’t need to re-render unless currentUser has changed. Passing something via context only works if SomeContext that you use to provide context and SomeContext that you use to read it are exactly the same object, as determined by a = comparison.Ĭall useContext at the top level of your component to read and subscribe to context. If your build system produces duplicates modules in the output (which can happen with symlinks), this can break context.Skipping re-renders with memo does not prevent the children receiving fresh context values. The previous and the next values are compared with the Object.is comparison. React automatically re-renders all the children that use a particular context starting from the provider that receives a different value.The corresponding needs to be above the component doing the useContext() call. useContext() call in a component is not affected by providers returned from the same component.React automatically re-renders components that read some context if it changes. If there is no such provider, then the returned value will be the defaultValue you have passed to createContext for that context. It is determined as the value passed to the closest SomeContext.Provider above the calling component in the tree. UseContext returns the context value for the calling component. The context itself does not hold the information, it only represents the kind of information you can provide or read from components.

SomeContext: The context that you’ve previously created with createContext.

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