LSP Auto complete with parenthesis

[Proful]

Expected (after pressing enter):-
<caption>{k.toUpperCase()}</caption>

Actual:-
<caption>{k.toUpperCase}</caption>

Any idea?

[the-mikedavis]

This behavior comes from the language server - it's sending just the toUpperCase and not the parentheses. This is very consistent behavior across language servers from what I've seen. Language servers typically complete paretheses if snippet support is enabled (#5864) because the server can also complete the function/method arguments with snippets.

Completing the parentheses in this case would probably be ok but it would only work for functions/methods with no arguments and it might be awkward if you have functions that can accept different numbers of arguments (for example, providing an optional argument in a language like Elixir).

Also see #2678 which is different but has some overlapping discussion.