const { OneFunctionAtTime } = require('one-function-at-time');

const queue = new OneFunctionAtTime();

// First function will run immediately
queue.add(next => {
    console.log('start 1');
    
    setTimeout(() => {
        console.log('end 1');
        next();
    });
});

// Second function will run after first function finish
queue.add(next => {
    console.log('start 2');
    
    setTimeout(() => {
        console.log('end 2');
        next();
    });
});

// start 1
// end 1
// start 2
// end 2


// Events
queue.on('start', () => {
    console.log('Start functions');
});

queue.on('finish', () => {
    console.log('All functions are finished');
});