Add support for spread operator

Author: amadeus

syntax/javascript.vim

@@ -82,6 +82,7 @@ syntax region  jsObjectValue       contained start=/:/ end=/\%(,\|}\)\@=/ contai
 syntax match   jsObjectFuncName    contained /\<[a-zA-Z_$][0-9a-zA-Z_$]*\>[\r\n\t ]*(\@=/ skipwhite skipempty nextgroup=jsFuncArgs
 syntax match   jsFunctionKey       contained /\<[a-zA-Z_$][0-9a-zA-Z_$]*\>\(\s*:\s*function\s*\)\@=/
 syntax match   jsObjectGetSet      contained /\%(get\|set\|static\)\%( \k\+\)\@=/ skipwhite skipempty nextgroup=jsObjectFuncName
+syntax match   jsObjectSpread      contained /\.\.\./
 
 exe 'syntax keyword jsNull      null             '.(exists('g:javascript_conceal_null')      ? 'conceal cchar='.g:javascript_conceal_null       : '')
 exe 'syntax keyword jsReturn    return contained '.(exists('g:javascript_conceal_return')    ? 'conceal cchar='.g:javascript_conceal_return     : '')
@@ -135,7 +136,7 @@ syntax region  jsClassBlock  contained matchgroup=jsClassBraces       start=/{/
 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
-syntax region  jsObject                matchgroup=jsObjectBraces      start=/{/  end=/}/  contains=jsObjectKey,jsObjectKeyString,jsObjectKeyComputed,jsObjectSeparator,jsObjectFuncName,jsObjectGetSet,jsGenerator,jsComment extend
+syntax region  jsObject                matchgroup=jsObjectBraces      start=/{/  end=/}/  contains=jsObjectKey,jsObjectKeyString,jsObjectKeyComputed,jsObjectSeparator,jsObjectFuncName,jsObjectGetSet,jsGenerator,jsComment,jsObjectSpread extend
 syntax region  jsTernaryIf             matchgroup=jsTernaryIfOperator start=/?/  end=/:/  contains=@jsExpression
 
 syntax match   jsGenerator            contained /\*/ skipwhite skipempty nextgroup=jsFuncName,jsFuncArgs
@@ -297,6 +298,7 @@ if version >= 508 || !exists("did_javascript_syn_inits")
   HiLink jsFuncArgDestructuring Noise
   HiLink jsModuleAsterisk       Noise
   HiLink jsClassProperty        Identifier
+  HiLink jsObjectSpread         Operator
 
   HiLink jsDomErrNo             Constant
   HiLink jsDomNodeConsts        Constant