When you see the error “Type ‘void’ is not assignable to type ‘ReactNode'”,
it means that you are trying to assign a “void” value to a variable or a prop that expects a value of type “ReactNode”.
In React, a “ReactNode” represents a single child element or multiple child elements that can be rendered within a component.
It can be a JSX element, a string or an array of JSX elements and strings.
When you define a component or a prop that expects a “ReactNode”, you are indicating that it can accept any valid JSX or string values as its content.
This allows you to pass child elements to components and render them within the component’s render method.
For example, let’s say you have a component called “Button” that expects a “ReactNode” as its children prop.
You can define the component as follows:
import React from 'react';
type ButtonProps = {
children: React.ReactNode;
};
const Button: React.FC = ({ children }) => {
return ;
};
export default Button;
In this example, the “Button” component has a prop called “children” of type “ReactNode”.
It expects to receive child elements directly within its opening and closing tags when used in JSX.
These child elements will be rendered inside the button element.
However, if you try to pass a “void” value as the child element of the Button component like:
<Button>void</Button>
You will encounter the “Type ‘void’ is not assignable to type ‘ReactNode'” error.
This is because the word “void” is considered a “void” type and it is not a valid value for a “ReactNode”.
To fix this error, you need to ensure that you are passing a valid JSX or string value as the child element for components that expect a “ReactNode”.
For example, you can pass a string value:
<Button>Click me</Button>
Or you can pass a JSX element:
<Button><span>Click me</span></Button>