node.js / browserify require（）不适用于变量，但确实适用于字符串文字

Question

    const x = 'ui/SelectBox.js';
    const module = require(x);

does not work (Error: Cannot find module 'ui/SelectBox.js'), but somehow

    const module = require('ui/SelectBox.js');

works. Also, if I call node on the commandline and do

var x = 'ui/SelectBox.js'; require(x); 

it does work.

I'm doing it on a win10 machine, but also tested the same thing under debian and got the same result. Oh, and I'm using watchify (tried it with browserify itself, to the same results...).

node --version

-> v5.6.0

EDiT: Okay, read my own answer. It might save you some trouble.

Answer 1

The answer to the riddle is, as always, depressingly simple.

You cannot abstract your require()s if you use browserify, because (I guess) browserify parses your source for requires.

So if you absolutely have to require() over a variable, make an object that maps names to require()d modules, and then use that.