fast-int-set
> A fast Set implementation for integer numbers, written in JavaScript This library has several data structures, focused on working with sets of integer values using get/set, and/or/not/xor operations
enumset32
High-performance, typesafe, small ordered set implemented in TypeScript
bytestreamjs
ByteStream is a library making possible to manipulates single bytes and bits on pure JavaScript
bitwise
Manipulates bits, nibbles, bytes, and buffers.