CODE EXAMPLE FOR JAVASCRIPT

react create context

import React from "react";
export const ThemeContext = React.createContext();

export default class Theme extends React.Component {
    constructor(props) {
        super(props);
        this.state = {
            mode: "dark",
            toggleMode: this.toggleMode
        }
    }
    toggleMode = () => {
        console.log('yes');
        this.setState({
            mode: this.state.mode === 'dark' ? 'light' : 'dark'
        });
    }
    render() {
        return (
            <ThemeContext.Provider value={this.state} >
                {this.props.children}
            </ThemeContext.Provider>
        )
    }
}