xstate inspired FSM Library for Espruino JavaScript Interpreter
This Espruino Library provides an XState v4 FSM–equivalent finite state machine (FSM)engine implemented in C, exposed to Espruino JavaScript via the standard library mechanism (jswrap). The goal is full feature parity with the XState v4 xstate-fsm package (minimal ~1 kB FSM), while aligning with XState semantics to enable tooling, visualization, and future AI-assisted workflows. A future roadmap includes hierarchical (nested) states and deeper SCXML alignment.
This project builds on the Espruino JavaScript Interpreter, an open-source JavaScript engine designed for microcontrollers.
Espruino is developed and maintained by Gordon Williams and contributors.
Copyright © 2013–2025 Gordon Williams
Licensed under the Mozilla Public License 2.0.
We gratefully acknowledge the Espruino project for providing the foundation and ecosystem into which this FSM library is integrated.
This project draws conceptual inspiration and API alignment from XState, a state machine and statecharts library for JavaScript and TypeScript.
Specifically, the initial requirements are derived from the XState v4 FSM package, which provided a minimal implementation of finite state machines in JavaScript.
Copyright © 2017–2025 Stately.ai and David Khourshid
Licensed under the MIT License.
We acknowledge the XState project as the primary inspiration for the semantics, syntax, and long-term vision of this FSM library, and recognize the value of its ecosystem in advancing state machine and statechart adoption.
This work also references the W3C SCXML: State Chart XML (State Machine Notation for Control Abstraction) specification.
We acknowledge the W3C standards community for providing a formal, machine-readable basis for state machine semantics.
This FSM library is an independent work intended to integrate XState-like semantics into the Espruino ecosystem. It is not affiliated with or endorsed by Espruino, Stately.ai, or the W3C.
All copyrights remain with their respective owners.