try to new Pin object

main.js

var webduino = require('webduino-js');

board = new webduino.WebArduino('Ge8pn');

board.on('ready', function (board) {
    var pin = new webduino.core.Pin(board, 10, Pin.DOUT);

    board.systemReset();
    board.samplingInterval = 250;
    var replay = new webduino.module.Relay(board, 10);
    exit;

    toggle(relay);
});

function toggle(relay) {
    var now = new Date();
    var hour = Date.getHours();
    if ( 6 < hour ) {
        relay.on();
    }
    if ( 18 < hour ) {
        relay.off();
    }
}