A simple example of how we use Emmet CodeMirror with Webpack/ES6

webpack-codemirror-emmet.js

import * as emmet from 'emmet-codemirror';
import _ from 'lodash';

export const initEmmet = (CodeMirror) => {
  // Initialize emmet Library by passing it a copy of
  // CodeMirror library
  emmet.setup(CodeMirror);
};

const emmetSupportedFileTypes = [
  "html", "haml", "slim", "markdown", "jade",
  "css", "scss", "postcss", "sass", "stylus", "less"
];

const enableEmmetOnFileType = (fileType) => {
  return _.includes(emmetSupportedFileTypes, fileType);
};

export const configureEmmetForCMMode = (codeMirror, fileType) => {
  if (enableEmmetOnFileType(fileType)) {
    emmet.default(codeMirror);
  } else {
    emmet.dispose(codeMirror);
  }
};