runtime(javascript): fix a few issues with syntax higlighting

Commit: 
https://github.com/vim/vim/commit/ea76096fa98ac26c23703bffdc4d9b3dc8a94d7e
Author: Tobiasz Laskowski <tobil...@outlook.com>
Date:   Wed Aug 14 14:50:56 2024 +0200

    runtime(javascript): fix a few issues with syntax higlighting
    
    It addresses the following issues:
    
    - Fix highlight of let and var javascript keywords
    
      According to runtime/doc/syntax.txt, Identifier is for variable names.
      let/var are not variable names, they are keywords
    
    - Add highlighting for "from" keyword in javascript
    
    - Fix highlight of function keyword in javascript
    
      According to docs, Function is for function names, so the function
      keyword should just be Keyword.
    
    - Fix highlight of static keyword in javascript
    
      According to vim docs: StorageClass static, register, volatile, etc.
    
    closes: #15480
    
    Signed-off-by: Tobiasz Laskowski <tobil...@outlook.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/syntax/javascript.vim b/runtime/syntax/javascript.vim
index e3b4cdf70..c73f5d709 100644
--- a/runtime/syntax/javascript.vim
+++ b/runtime/syntax/javascript.vim
@@ -10,6 +10,7 @@
 " Last Change: 2022 Jun 09
 "              2013 Jun 12: adjusted javaScriptRegexpString (Kevin Locke)
 "              2018 Apr 14: adjusted javaScriptRegexpString (LongJohnCoder)
+"              2024 Aug 14: fix a few stylistic issues (#15480)
 
 " tuning parameters:
 " unlet javaScript_fold
@@ -59,14 +60,15 @@ syn keyword javaScriptType          Array Boolean Date 
Function Number Object String Reg
 syn keyword javaScriptStatement                return with await yield
 syn keyword javaScriptBoolean          true false
 syn keyword javaScriptNull             null undefined
-syn keyword javaScriptIdentifier       arguments this var let
+syn keyword javaScriptIdentifier       arguments this
 syn keyword javaScriptLabel            case default
 syn keyword javaScriptException                try catch finally throw
 syn keyword javaScriptMessage          alert confirm prompt status
 syn keyword javaScriptGlobal           self window top parent
 syn keyword javaScriptMember           document event location 
 syn keyword javaScriptDeprecated       escape unescape
-syn keyword javaScriptReserved         abstract boolean byte char class const 
debugger double enum export extends final float goto implements import int 
interface long native package private protected public short static super 
synchronized throws transient volatile async
+syn keyword javaScriptReserved         abstract boolean byte char class const 
debugger double enum export extends final float from goto implements import int 
interface let long native package private protected public short super 
synchronized throws transient var volatile async
+syn keyword javaScriptModifier  static
 
 syn cluster  javaScriptEmbededExpr     
contains=javaScriptBoolean,javaScriptNull,javaScriptIdentifier,javaScriptStringD,javaScriptStringS,javaScriptStringT
 
@@ -110,7 +112,7 @@ hi def link javaScriptBranch                Conditional
 hi def link javaScriptOperator         Operator
 hi def link javaScriptType                     Type
 hi def link javaScriptStatement                Statement
-hi def link javaScriptFunction         Function
+hi def link javaScriptFunction         Keyword
 hi def link javaScriptBraces           Function
 hi def link javaScriptError            Error
 hi def link javaScrParenError          javaScriptError
@@ -126,6 +128,7 @@ hi def link javaScriptGlobal                Keyword
 hi def link javaScriptMember           Keyword
 hi def link javaScriptDeprecated               Exception 
 hi def link javaScriptReserved         Keyword
+hi def link javaScriptModifier         StorageClass
 hi def link javaScriptDebug            Debug
 hi def link javaScriptConstant         Label
 hi def link javaScriptEmbed            Special

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