doSomethingCritical().then((result) => {
    doSomethingOptional(result).then(optionalResult => {
        doSomethingExtraNice(optionalResult)
    }).catch(() => {
        console.log('Catch() interno');
    });
}).then(() => {
    moreCriticalStuff();
}).catch(() => {
    console.log('Catch() externo');
});