bsmap - Beat Saber Beatmap Scripting Library

bsmap is a general-purpose TypeScript library for creating, reading, and modifying Beat Saber beatmaps programmatically. Current stable version is 2.3.4. Maintained actively with frequent releases (every few months). It supports all major beatmap schema versions (v1 through v4.1.0) and modding extensions like Chroma, Cinema, Noodle Extensions, and Mapping Extensions out of the box. Key differentiators: fully-typed schema wrappers for cross-version compatibility, partial object creation with default filling, tree-shakeable modules, built-in validators and optimisers, and utilities for math, color, and easing. Works with Deno, Bun, Node.js (ESM/CJS), and browser bundlers.