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Очередь событий (Event Loop)

var colors = require('colors');

/* Макрозадачи */
setImmediate(() => {
    console.log('#9 setImmediate'.cyan);
});
setTimeout(() => {
    console.log('#8 setTimeout'.green);
}, 0);

/* Микрозадачи */
queueMicrotask(() => {
    console.log('#5 queueMicrotask 1'.magenta);
});
Promise.resolve().then(() => {
    console.log('#6 Promise.resolve().then'.bgBlack);
});
queueMicrotask(() => {
    console.log('#7 queueMicrotask 2'.magenta);
});
process.nextTick(() => {
    console.log('#4 process.nextTick'.red);
});

/* Макрозадачи */
console.log('#1 StartScript'.yellow);

new Promise(() => {
    console.log('#2 new Promise'.bgBlack);
});

console.log('#3 EndScript'.yellow);

/*
 * Вывод:
 * #1 StartScript
 * #2 new Promise
 * #3 EndScript
 * #4 process.nextTick
 * #5 queueMicrotask 1
 * #6 Promise.resolve().then
 * #7 queueMicrotask 2
 * #8 setTimeout
 * #9 setImmediate
 **/