Microtasks execution relative to Macrotasks in Node.js.

In Simple Words:

• Microtasks include process.nextTick() and Promise callbacks (.then(), await, queueMicrotask).
• In Node.js, the microtask queue executes immediately after the currently running JavaScript operation finishes, between every phase transition of the event loop.
• nextTick queue runs with highest priority, followed by the standard Promise microtask queue.

Promise.resolve().then(() => console.log('Promise Microtask'));
process.nextTick(() => console.log('nextTick Microtask (runs first!)'));
console.log('Synchronous script');
// Output: Synchronous script -> nextTick Microtask -> Promise Microtask