TypeScript and React: guide with Conditional Rendering Based on State Type Inference
I've been struggling with this for a few days now and could really use some help. Quick question that's been bugging me - I'm working on a React application using TypeScript where I have a state that can either be a string or null, and I'm trying to implement conditional rendering based on the state value. However, I'm working with issues with TypeScript not inferring the type correctly in my JSX. The state is initialized as `null`, and when the user interacts with an input field, it updates the state to a string value, but TypeScript gives a type behavior. Here’s a simplified version of my component: ```typescript import React, { useState } from 'react'; const MyComponent: React.FC = () => { const [inputValue, setInputValue] = useState<string | null>(null); const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => { setInputValue(e.target.value); }; return ( <div> <input type="text" onChange={handleChange} /> {inputValue ? <p>You entered: {inputValue}</p> : <p>Please enter something</p>} </div> ); }; export default MyComponent; ``` When I try to render it, I get the following TypeScript behavior: ``` Type 'null' is not assignable to type 'string'. ``` I've tried adding a type assertion in the JSX where I'm rendering the state like this: ```typescript {(inputValue as string) ? <p>You entered: {inputValue}</p> : <p>Please enter something</p>} ``` But that feels more like a workaround than a proper solution. Is there a better way to handle this conditionally, or is there something I’m missing regarding TypeScript’s type inference in this context? I’m using TypeScript 4.5 and React 17.0.2, and any help would be appreciated! I'm coming from a different tech stack and learning Typescript. The stack includes Typescript and several other technologies.