The error message "The property 'handleLoginDisplay' is not found in the type 'Readonly<{}> & Readonly<{ children?: ReactNode; }>'" is displayed

When I try to compile this TypeScript code, it throws an error. Can anyone help me understand why?

import { connect } from 'react-redux';
import React from "react";
import { Link, Redirect } from "react-router-dom";

class HeaderComponent extends React.Component {
    render() {
        return (
            <header>
                <div><Link to="">Sign up</Link></div>
                <div>{this.props.handleLoginDisplay}</div>
            </header>
        )
    }
}

const mapStateToProps = (state: { showLoginModal: any; }) => {
    return {
        showLoginModal: state.showLoginModal
    }
}

const mapDispatchToProps = (dispatch: (arg0: { type: string; }) => void) => {
    return {
        handleLoginDisplay: () => dispatch({ type: 'HANDLE_LOGIN_DISPLAY' })
    }
}

export default connect(mapStateToProps, mapDispatchToProps)(HeaderComponent);

The compiler is showing the error message: Property 'handleLoginDisplay' does not exist on type 'Readonly<{}> & Readonly<{ children?: ReactNode; }>'.ts(2339)

Answer №1

To specify the type of props that a component will receive, you need to define an interface like this:

interface Props {
    showLoginModal: boolean;
    handleLoginDisplay: () => void;
}

class HeaderComponent extends React.Component<Props> {
    render() {
        return (
            <header>
                 <div><Link to="">Sign up</Link></div>
                 <div>{this.props.handleLoginDisplay}</div>
             </header>
     )}
 }

By doing this, TypeScript will know that HeaderComponent is expecting these specific props. Also remember to remove any references to mapStateToProps.

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