import * as CodeMirror from 'codemirror'
import 'codemirror/addon/fold/indent-fold.js'  # should add `fold` object to `CodeMirror`

console.log typeof CodeMirror          ## 'object'
console.log typeof CodeMirror.fold     ## 'undefined'
console.log typeof CodeMirror.default  ## 'function'

## Work-around:
console.log typeof CodeMirror.default.fold  ## 'object'

import CodeMirror from 'codemirror'
import 'codemirror/addon/fold/indent-fold.js'  # should add `fold` object to `CodeMirror`

console.log typeof CodeMirror          ## 'function'
console.log typeof CodeMirror.fold     ## 'object'
console.log typeof CodeMirror.default  ## 'undefined'