There are well over 200 JavaScript frameworks alone, not to mention hundreds of thousands of add on libraries, not to mention as many in CSS stylesheets for styling pages. There are around 50 or more backend JavaScript technologies, plus most languages now a day can compile to JavaScript.
You test for basic understanding of concepts. You cannot test specifics but people do just to disqualify Americans. If we were auto mechanics we would like testing on principles not which brand of tool you are working with. But technology is that complex due to deprecations and updates that the big cabal can now play that exclusion game.
A programmer can work with any language, framework, library, topology, if given the proper time and training. And do not bullshit yourselves, all the big corporations like Goldman Sachs, JP Morgan, Citicorp, and more have training facilities inside their corporate headquarters. I know, I put some together. Goldman has a 3x movie theatre with 3 400 inch screens since the 1990's for example.
They tried to starve America, period. Wall street Jews and their Saudi Counterparts.