bug#40760: 27.0.50; An indentation problem with const and chaining in js-mode

[Dmitry Gutov <dgutov@yandex.ru>]

On 21.03.2022 08:26, Marcin Borkowski wrote:

> Interesting - I thought using spaces for indentation is a no-no nowadays
> (at least in JS, Lisp is another thing, for obvious reasons).  But I may
> be mistaken, and I don't think tabs are inherently better - though we do
> use them in our company.

There are a bunch of odd styles in use in JS. For example, comma-first 
indentation, where you don't put commas at the end of a line, and 
instead add newline and indentation before them.

But space-based indentation still seems prevalent.

Anyway...

>> This indentation feature was ported from js2-mode at some point, where
>> it is guarded by the (on by default) user option
>> js2-pretty-multiline-declarations. The option itself was lost in
>> transition.
>>
>> See js2-old-indent.el for more info.
> 
> Very interesting.  FWIW, I almost never have many variables in a single
> let/const - I prefer to write
> 
> let a = 1;
> let b = 2;
> const c = 3;
> const d = 4;
> 
> (and this also is a style I learned where I work).

At some point support for multi-var combined declarations was requested 
for, that's when I added that var.

So, the code is out there, it shouldn't be hard to adapt to js-mode, if 
you have the time.