Compacta números en Javascript

Compacta números en Javascript:

const formatter = Intl.NumberFormat('en', {
	notation: 'compact'
});

console.log(formatter.format(123)); // 123
console.log(formatter.format(1234)); // 1.2K
console.log(formatter.format(1234567)); // 1.2M
console.log(formatter.format(12345678901)); // 12B