JSX(Adobeの方)でスクリプトファイル自身のpathを求める ref: https://qiita.com/mazgi/items/863e9083430084e82cba

file0.txt

const SELF = (function(){
    try {app.documents.test()}
    catch(e) {return File(e.fileName)}
})();
$.writeln(SELF instanceof File);
$.writeln(SELF);
$.writeln(SELF.path);

path.jsx

const SELF = (function(){
    try {app.documents.test()}
    catch(e) {return File(e.fileName)}
})();
$.writeln(SELF instanceof File);
$.writeln(SELF);
$.writeln(SELF.path);