https://gist.github.com/Be1zebub/7af10197ba93d2c87f6ac2e6a8e6d8f5

bitmask-class-usage.js

const PERMISSIONS = {
	READ: 1,
	WRITE: 2,
	EXECUTE: 4,
	DELETE: 8,
	ADMIN: 16,
}

const permissions = new BitMask()
permissions
	.add(PERMISSIONS.READ)
	.add(PERMISSIONS.WRITE)
	.add(PERMISSIONS.EXECUTE)

console.log("Permissions value:", permissions.getValue())
console.log("Has READ:", permissions.has(PERMISSIONS.READ))
console.log("Has DELETE:", permissions.has(PERMISSIONS.DELETE))
console.log("Binary:", permissions.toBinary())
console.log("Active permissions:", permissions.toArray())

const features = BitMask.fromArray([1, 4, 16])
console.log("Features:", features.getValue())

const bigMask = new BitMask(0, true)
bigMask.add(2n ** 50n)