hunk.code_window:  */
   Object.keys(Transforms).forEach((type) => {
     Transform.prototype[type] = function (...args) {
       return Transforms[type](this, ...args)
     }
   })
   /**
  
hunk.labels: keep keep keep add keep keep keep keep keep
hunk.after_edit:     debug(type, { args })
  
hunk.file_path: src/models/transform.js
hunk.type: add
file: 
  import assert from 'assert'
  
  export default function (state) {
    const { document, selection } = state
    const texts = document.getTexts()
    const first = texts.get(0)
    const second = texts.get(1)
    const third = texts.get(2)
    const range = selection.merge({
      anchorKey: first.key,
      anchorOffset: first.length,
      focusKey: second.key,
      focusOffset: 0
    })
  
    const next = state
      .transform()
      .moveTo(range)
      .delete()
      .apply()
  
    assert.deepEqual(
      next.selection.toJS(),
      range.collapseToStart().toJS()
    )
  
    return next
  }
  