How to extend type union props to a react class component?

To extend type union props for a React class component, you can use TypeScript's intersection (&) operator. This allows you to merge multiple types together, effectively combining their props into a single type that you can use for your class component.

Here's how you can do it:

1. Define Prop Types:

   • First, define your different prop types as separate interfaces.

   typescriptCopy code
   interface CommonProps {
     // Define common props here
     className?: string;
   }
   
   interface ComponentAProps {
     // Props specific to ComponentA
     propA: string;
   }
   
   interface ComponentBProps {
     // Props specific to ComponentB
     propB: number;
   }
   

2. Create Your Class Component:

   • Next, create your class component and use the intersection (&) operator to merge the common props with the specific props for ComponentA or ComponentB.

   typescriptCopy code
   import React, { Component } from 'react';
   
   interface MyComponentProps extends CommonProps, ComponentAProps {
     // Using intersection to combine the props
   }
   
   class MyComponent extends Component<MyComponentProps> {
     render() {
       // Access props as usual
       const { className, propA, propB } = this.props;
   
       return (
         <div className={className}>
           <p>Component A Prop: {propA}</p>
           <p>Component B Prop: {propB}</p>
         </div>
       );
     }
   }
   

3. Using the Component:

   • Now you can use your MyComponent class component, passing the required props based on the combination of ComponentAProps and ComponentBProps.

   jsxCopy code
   // Example usage
   <MyComponent propA="Hello" propB={42} className="custom-class" />
   

By extending the type union props using the intersection operator, you can create more flexible and reusable components that accept a combination of different props. This pattern is particularly useful when you have multiple related components that share some common props but have unique additional props.