"Demonstration of runtime scope deduction in JS/ES"

/*!(
{   "date_modified":"+2019-01-17"
,   "author_name":"R.V.Klein"
,   "author_url":"https://rvklein.me"
,   "title":"Demonstration of runtime scope deduction in JS/ES"
})!*/

var _=_(this);function _(that)
{'use strict';

    function isOwnConstructor (x)
    {
        return(
            (   ('object'===typeof(x))
            &&  (x.constructor.name in x)
            &&  (x instanceof x[x.constructor.name])
            &&  ('function'===typeof(x.constructor.constructor))
            &&  (x.constructor.constructor instanceof Function)
            &&  (Function===x.constructor.constructor)
        )
        ?true:false);
    }

    var _={scope:{that:undefined},scopeType:undefined,_hasStrictMode:undefined};

    try{if(isOwnConstructor(this)){_._hasStrictMode=false;}else{_._hasStrictMode=true;}}catch(e){};
    if(that&&isOwnConstructor(that)){_.scope.that=that;}

    try{if(isOwnConstructor(self)){_.scope.self=self;}}catch(e){};
    try{if(isOwnConstructor(global)){_.scope.global=global;}}catch(e){};
    try{if(isOwnConstructor(window)){_.scope.window=window;}}catch(e){};

    try{_._currentScript=_.window.document.currentScript;}catch(e){};

    if(('self' in _.scope)&&((!_.scope.that)||(_.scope.that===_.scope.self))){ _.scopeType='self'; }
    if(('global' in _.scope)&&('Object'===_.scope.global.constructor.name)&&((!_.scope.that)||(_.scope.that===_.scope.global))){ _.scopeType='global'; }
    if(('window' in _.scope)&&('Window'===_.scope.window.constructor.name)&&((!_.scope.that)||(_.scope.that===_.scope.window))&&('document' in _.scope.window)){ _.scopeType='window'; }

    return(_);
}