XState

XState is a JavaScript/TypeScript library for modeling application logic as finite state machines and hierarchical statecharts, enabling developers to define states, transitions, guards, actions, and invoked services declaratively. With built-in support for parallel and history states, runtime interpreters, visualizers, and integrations for React, Vue, Angular, and Node.js, XState delivers predictable, testable, and maintainable state management for complex synchronous and asynchronous workflows.