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xstate

Finite State Machines and Statecharts for the Modern Web.

  • 5.18.2
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What is xstate?

The xstate npm package is a library for creating, interpreting, and executing finite state machines and statecharts, as well as managing invocations of those machines as actors. It provides a robust framework for modeling and analyzing application logic in a composable and declarative way, which can help manage complex state logic in UIs, robotics, and other systems.

What are xstate's main functionalities?

Finite State Machines

This feature allows you to create simple finite state machines. The code sample demonstrates a toggle machine with two states: 'active' and 'inactive'.

{"import { Machine } from 'xstate';\n\nconst toggleMachine = Machine({\n  id: 'toggle',\n  initial: 'inactive',\n  states: {\n    inactive: { on: { TOGGLE: 'active' } },\n    active: { on: { TOGGLE: 'inactive' } }\n  }\n});"}

Statecharts

This feature allows you to create statecharts, which are an extension of state machines that can have hierarchical and parallel states. The code sample shows a traffic light machine with three states: 'green', 'yellow', and 'red'.

{"import { Machine } from 'xstate';\n\nconst lightMachine = Machine({\n  id: 'light',\n  initial: 'green',\n  states: {\n    green: { on: { TIMER: 'yellow' } },\n    yellow: { on: { TIMER: 'red' } },\n    red: { on: { TIMER: 'green' } }\n  }\n});"}

Interpreters

This feature allows you to interpret and execute the state machines and statecharts. The code sample demonstrates how to start a service that interprets the toggleMachine and logs state transitions.

{"import { interpret } from 'xstate';\n\nconst service = interpret(toggleMachine).onTransition((state) => console.log(state.value));\n\nservice.start();\nservice.send('TOGGLE');\nservice.send('TOGGLE');"}

Actors

This feature allows you to manage machine invocations as actors, which can send and receive events from other machines. The code sample shows how to spawn a child machine within a parent machine's context.

{"import { spawn, Machine } from 'xstate';\n\nconst parentMachine = Machine({\n  context: {\n    child: null\n  },\n  entry: ['spawnChild']\n}, {\n  actions: {\n    spawnChild: assign({\n      child: () => spawn(someMachine)\n    })\n  }\n});"}

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Package last updated on 21 Sep 2024

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