Improvements to rest highlighting

* Added higher specificity to the dots in the spread declaration

Author: amadeus

syntax/javascript.vim

@@ -219,7 +219,8 @@ syntax match   jsGenerator      contained '\*' nextgroup=jsFuncName skipwhite
 syntax match   jsFuncName       contained /\<[a-zA-Z_$][0-9a-zA-Z_$]*/ nextgroup=jsFuncArgs skipwhite
 syntax region  jsFuncArgs       contained matchgroup=jsFuncParens start='(' end=')' contains=jsFuncArgCommas,jsFuncArgRest,jsAssignmentExpr,jsComment,jsLineComment nextgroup=jsFuncBlock keepend skipwhite skipempty
 syntax match   jsFuncArgCommas  contained ','
-syntax match   jsFuncArgRest    contained /\%(\.\.\.[a-zA-Z_$][0-9a-zA-Z_$]*\))/
+syntax match   jsFuncArgRest  contained /\%(\.\.\.[a-zA-Z_$][0-9a-zA-Z_$]*\))/ contains=jsFuncArgRestDots
+syntax match   jsFuncArgRestDots contained /\.\.\./
 
 exe 'syntax match jsArrowFunction /=>/ '.(exists('g:javascript_conceal_arrow_function') ? 'conceal cchar='.g:javascript_conceal_arrow_function : '')
 
@@ -315,6 +316,7 @@ if version >= 508 || !exists("did_javascript_syn_inits")
   HiLink jsModules              Include
   HiLink jsModuleWords          Include
   HiLink jsDecorator            Special
+  HiLink jsFuncArgRestDots    Noise
 
   HiLink jsDomErrNo             Constant
   HiLink jsDomNodeConsts        Constant