What are the best practices for using context and hooks in TypeScript?

What are the best practices for using context and hooks in TypeScript?

When using context and hooks in TypeScript, it's important to define your context types clearly. This helps with type safety.

Can you give me an example of how to define a context in TypeScript?

Sure! You can create a context like this:

import React, { createContext, useContext } from 'react';

interface MyContextType {
  value: string;
  updateValue: (newValue: string) => void;
}

const MyContext = createContext<MyContextType | undefined>(undefined);

export const MyProvider: React.FC = ({ children }) => {
  const [value, setValue] = useState('');
  const updateValue = (newValue: string) => setValue(newValue);

  return <MyContext.Provider value={{ value, updateValue }}>{children}</MyContext.Provider>;
};

export const useMyContext = () => {
  const context = useContext(MyContext);
  if (!context) {
    throw new Error('useMyContext must be used within a MyProvider');
  }
  return context;
};

This defines a context with a value and an update function.

What should I be careful about when using context?

Be cautious of unnecessary re-renders. Only wrap components that need access to the context, and consider memoizing values.

Are there any performance considerations I should keep in mind?

Yes, avoid placing large objects in context as it can lead to performance issues. Instead, use selectors or split context if needed.