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Noteworthy tweak is the fact that it seems `zuul` are eagerly loading
all `require('whatever-package-or-path')` it sees before pushing the
contents to Saucelabs.
That was troublesome because we don't want the `esm` package to be
loaded when running browser tests. But it was, even though we loaded
`esm` conditionally after checking the current Node.js version used.
The trick was to not use `require('esm')` but `module.require('esm')`
instead, to fool the assumed look-out for `require` somewhere inside
`zuul`'s code.