bug#47488: Treatment of # in js.el

[Dmitry Gutov]

On 10.05.2021 11:34, Reuben Thomas via Bug reports for GNU Emacs, the 
Swiss army knife of text editors wrote:
> Sorry not to be more useful here, but one suggestion: I doubt there
> are many code bases that use the hash character in both senses, so if
> there were a solution that allowed both to be supported but not at the
> same time, that would already be a big improvement on the current
> situation. (My impression is that using cpp with JavaScript is very
> much a legacy technique.)

Well, Mozilla codebase is the one that does both (and I doubt there are 
many other examples of using C preprocessor in JS).

We could add a custom var that disables this behavior, of course. 
js2-mode has one, but it only affects the parser, not the indentation 
behavior.