Update

after/syntax/jsx.vim

@@ -0,0 +1,59 @@
+if !exists('g:polyglot_disabled') || (index(g:polyglot_disabled, 'javascript') == -1 && index(g:polyglot_disabled, 'jsx') == -1)
+
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+" Vim syntax file
+"
+" Language: javascript.jsx
+" Maintainer: MaxMellon <maxmellon1994@gmail.com>
+"
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+let s:jsx_cpo = &cpo
+set cpo&vim
+
+syntax case match
+
+if exists('b:current_syntax')
+  let s:current_syntax = b:current_syntax
+  unlet b:current_syntax
+endif
+
+if exists('s:current_syntax')
+  let b:current_syntax = s:current_syntax
+endif
+
+if hlexists("jsDebugger") || hlexists("jsNoise")    " yuezk/vim-js or pangloss/vim-javascript
+  syntax cluster jsExpression add=jsxRegion
+elseif hlexists("javascriptOpSymbols")    " othree/yajs.vim
+  " refine the javascript line comment
+  syntax region javascriptLineComment start=+//+ end=/$/ contains=@Spell,javascriptCommentTodo extend keepend
+  syntax cluster javascriptValue add=jsxRegion
+  syntax cluster javascriptNoReserved add=jsxElement,jsxTag
+else    " build-in javascript syntax
+  " refine the javascript line comment
+  syntax region javaScriptLineComment start=+//+ end=/$/ contains=@Spell,javascriptCommentTodo extend keepend
+
+  " refine the template string syntax
+  syntax region javaScriptEmbed matchgroup=javaScriptEmbedBraces start=+\${+ end=+}+ contained contains=@javaScriptEmbededExpr
+
+  " add a javaScriptBlock group for build-in syntax
+  syntax region javaScriptBlock
+        \ matchgroup=javaScriptBraces
+        \ start="{"
+        \ end="}"
+        \ contained
+        \ extend
+        \ contains=javaScriptBlock,@javaScriptEmbededExpr,javaScript.*
+        \ fold
+
+  syntax cluster javaScriptEmbededExpr add=jsxRegion,javaScript.*
+endif
+
+runtime syntax/jsx_pretty.vim
+
+let b:current_syntax = 'javascript.jsx'
+
+let &cpo = s:jsx_cpo
+unlet s:jsx_cpo
+
+endif