code: function onRead( error, data ) {
  		if ( error ) {
  			return done( error );
  		}
  		data = parse( data, opts.reviver );
  		if ( data instanceof Error ) {
  			return done( data );
  		}
  		done( null, data );
  	}
docs: FUNCTION: onRead( error, data )
  Callback invoked upon attempting to read a file.
  
  @private
  @param {Error|Null} error - error object
  @param {String} data - file data
  @returns {Void}