JSFiddle - React, Tailwind, and code Playground

JavaScript

//module a
define(function(){
    var a = {};
    a.fileToLookup = 'file.txt';
    return a;
});

//module b
define(['a'], function(){

    var b = {};
    require(['text!' + a.fileToLookup], function(txt){
        b.condintionalText = txt;
    })
        
    return b;
});

//module c
define(['b'], function(){
    console.log(b.condintionalText);  //undefined
});