bug#8724: 23.2; js-mode imenu should be more thorough

[Dmitry Gutov]

On 02.06.2021 10:58, Lars Ingebrigtsen wrote:
> This was nine years ago -- was there any progress with this?  (It sounds
> like a good change, but I haven't looked at the code.)

Someone should really work in that direction, since in these nine years 
JS has grown more ways to define a function: e.g. arrow functions, or 
'const <function name> = ...'.

I've tried simply replacing the definition.

The patch kinda works, except I'm not sure about the (top) and (bottom) 
items that it adds (we don't have any precedent for this, so I vote no), 
and there's some sort of duplication of the entries: I see both (top) 
and the enclosed function name repeated an extra time in the imenu index.