Looking into the code, a minimal code-repro looks like this:

someObject.someMethod();

Activating treesit-explore-mode on that, yields the following tree:

(expression_statement
  (call_expression
   function: (member_expression object: (identifier) . property: 
(property_identifier))
   arguments: (arguments ( )))
  ;)

Now looking in js.el I see the following which looks like it's trying to 
fontify this, but for some reason it's not working:

      (call_expression
       function: [(identifier) @font-lock-function-name-face
                  (member_expression
                   property:
                   (property_identifier) @font-lock-function-name-face)])

I'm guessing this fontification is being overridden further down (just 
like for csharp-ts-mode). From what I can tell, reversing the order of 
declarations seems to fix this for me.

See attached path.

--
Jostein

On 08.12.2022 14:56, Jostein Kjønigsen wrote:
>
> As the title says, using js-ts-mode method-names are not fontified 
> properly.
>
> myFunction();
> myObject.myMethod();
>
> In the above examples myFunction is fontified using 
> font-lock-function-name (expected) bit myMethod() is fontified using 
> font-lock-property-face (not expected).
>
> I would expect both calls to use font-lock-function-name for 
> fontification.
>
> --
> Jostein
>
> In GNU Emacs 29.0.60 (build 1, x86_64-pc-linux-gnu, GTK+ Version
>  3.24.33, cairo version 1.16.0) of 2022-12-08 built on dev-jostein
> Repository revision: 8fb2afe051168b2eac2bba0ee102039d0af90a05
> Repository branch: emacs-29
> Windowing system distributor 'The X.Org Foundation', version 11.0.12201001
> System Description: Ubuntu 22.04.1 LTS
>
> Configured using:
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>
> Configured features:
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>
> Major mode: JavaScript
>
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>
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> compat-autoloads web-mode-autoloads undo-tree-autoloads queue-autoloads
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> dynamic-setting system-font-setting font-render-setting cairo
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> emacs)
>
> Memory information:
> ((conses 16 581099 38842)
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>  (strings 32 185380 10974)
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>
> -- 
> *Jostein Kjønigsen*
> jostein.kjønigsen.no <https://jostein.kjønigsen.no>
> jostein@kjonigsen.net - jostein@gmail.com