Reasoning about the layout of an event-loop tick, consider this code. What does it print, and which scheduling rule explains the ordering?

const fs = require('fs'); setImmediate(() => console.log('immediate')); Promise.resolve().then(() => console.log('promise')); fs.readFile(__filename, () => { setTimeout(() => console.log('timeout'), 0); setImmediate(() => console.log('inner immediate')); process.nextTick(() => console.log('nextTick')); }); console.log('sync');