JSFiddle - React, Tailwind, and code Playground

JavaScript

function outer() {
    var outer_var = 'outer var';
    
    function inner() {
        var inner_var = 'inner var';
        
        return inner_var;
    }
    
    function ref() {
        console.log(outer_var + ' ' + inner());
    }
    
    return ref;
}

var myRef = outer();

myRef();