First pass at fix for #433

Author: amadeus

syntax/javascript.vim

@@ -131,7 +131,7 @@ syntax region  jsParenIfElse contained matchgroup=jsParens            start=/(/
 syntax region  jsParenRepeat contained matchgroup=jsParens            start=/(/  end=/)/  contains=@jsAll skipwhite skipempty nextgroup=jsBlock fold extend
 syntax region  jsParenSwitch contained matchgroup=jsParens            start=/(/  end=/)/  contains=@jsAll skipwhite skipempty nextgroup=jsSwitchBlock fold extend
 syntax region  jsParenCatch  contained matchgroup=jsParens            start=/(/  end=/)/  skipwhite skipempty nextgroup=jsBlock fold extend
-syntax region  jsClassBlock  contained matchgroup=jsClassBraces       start=/{/  end=/}/  contains=jsFuncName,jsClassMethodDefinitions,jsOperator,jsArrowFunction,jsArrowFuncArgs,jsComment,jsGenerator,jsDecorator  fold
+syntax region  jsClassBlock  contained matchgroup=jsClassBraces       start=/{/  end=/}/  contains=jsFuncName,jsClassMethodDefinitions,jsOperator,jsArrowFunction,jsArrowFuncArgs,jsComment,jsGenerator,jsDecorator,jsClassProperty  fold
 syntax region  jsFuncBlock   contained matchgroup=jsFuncBraces        start=/{/  end=/}/  contains=@jsAll fold extend
 syntax region  jsBlock       contained matchgroup=jsBraces            start=/{/  end=/}/  contains=@jsAll extend fold
 syntax region  jsSwitchBlock contained matchgroup=jsBraces            start=/{/  end=/}/  contains=@jsAll,jsLabel extend fold
@@ -157,10 +157,12 @@ exe 'syntax match jsArrowFunction /=>/      skipwhite skipempty nextgroup=jsFunc
 
 syntax keyword jsClassKeywords          contained extends class
 syntax match   jsClassNoise             contained /\./
-syntax match   jsClassMethodDefinitions contained /\%(get\|set\|static\)\%( \k\+\)\@=/ skipwhite skipempty nextgroup=jsFuncName
+syntax match   jsClassMethodDefinitions contained /\%(get\|set\|static\)\%( \k\+\)\@=/ skipwhite skipempty nextgroup=jsFuncName,jsClassProperty
 syntax match   jsClassDefinition        /\<class\>\%( [a-zA-Z_$][0-9a-zA-Z_$ \n.]*\)*/ contains=jsClassKeywords,jsClassNoise skipwhite skipempty nextgroup=jsClassBlock
 syntax match   jsDecorator              contained "@" nextgroup=jsDecoratorFunction
 syntax match   jsDecoratorFunction      contained "[a-zA-Z_][a-zA-Z0-9_.]*"
+syntax match   jsClassProperty          contained /\<[0-9a-zA-Z_$]*\>\(\s*=\)\@=/ skipwhite skipempty nextgroup=jsClassEquals
+syntax match   jsClassEquals            contained /=/ skipwhite skipempty nextgroup=@jsExpression
 
 " Comments
 syntax keyword jsCommentTodo    contained TODO FIXME XXX TBD
@@ -291,6 +293,8 @@ if version >= 508 || !exists("did_javascript_syn_inits")
   HiLink jsFuncArgRestDots      Noise
   HiLink jsFuncArgDestructuring Noise
   HiLink jsModuleAsterisk       Noise
+  HiLink jsClassEquals          Operator
+  HiLink jsClassProperty        Identifier
 
   HiLink jsDomErrNo             Constant
   HiLink jsDomNodeConsts        Constant