Code mirror jsx mode

error-style.css

.cm-s-monokai .cm-tag.cm-error,
.cm-s-monokai .cm-bracket.cm-error {
  color: #f92672;
  background: transparent;
}

jsx-mode.js

CodeMirror.defineMode("jsx", function(config) {
  return CodeMirror.multiplexingMode(
    CodeMirror.getMode(config, "javascript"),
    { 
      open: '<', close: '>',
      mode: CodeMirror.multiplexingMode(
        CodeMirror.getMode(config, { name: "xml", htmlMode: true }),
        { 
          open: "{", close: "}",
          mode: CodeMirror.getMode(config, "javascript"),
          parseDelimiters: false
        }),
      parseDelimiters: true
    });
});