index.js
function data(app, file, key) {
  var o = has(app.options, key);
  var c = has(app.cache.data, key);
  var d = has(file.data, key);
  if (!c && !d && !o) {
    set(file.data, key, comment(key, 'property'));
    console.log(warning(' missing variable:'));
  }
}
function data(app, file, key) {
  var o = has(app.options, key);
  var c = has(app.cache.data, key);
  var d = has(file.data, key);
  if (!c && !d && !o) {
    set(file.data, key, comment(key, 'property'));
    console.log(warning(' missing variable:'));
  }
}
function data ( app , file , key ) { var o = has ( app . options , key ) ; var c = has ( app . cache . data , key ) ; var d = has ( file . data , key ) ; if ( ! c && ! d && ! o ) { set ( file . data , key , comment ( key , 'property' ) ) ; console . log ( warning ( ' missing variable:' ) ) ; } }
Find missing data.

@param  {Object} `app`
@param  {Object} `file`
@param  {String} `key`
@return {Object}
Find missing data .