nl_tokens: Creates a new instance of Shortline which can be used to prompt users for input .
pl_tokens: function Shortline ( options ) { const <mask> = this ; self . _input = ( options && options . input ) || process . stdin ; self . _output = ( options && options . output ) || process . stderr ; /** Most recent error emitted by the input stream.
     * @type {Error}
     */ self . inputError = null ; self . _input . on ( 'end' , ( ) => { self . inputError = new EOFError ( EOF_MESSAGE ) ; } ) ; // Note:  Can't listen for 'error' since it changes behavior if there are no // other listeners.  Listen for it only when reading from input (since that // is our error and will be returned to the caller). }