eslint-plugin-xstate
ESLint plugin to check for common mistakes and enforce good practices when using XState library.
Installation
You'll first need to install ESLint:
$ npm i eslint --save-dev
Next, install eslint-plugin-xstate:
$ npm install eslint-plugin-xstate --save-dev
Usage
Add xstate to the plugins section of your .eslintrc configuration file. You can omit the eslint-plugin- prefix:
{
"plugins": ["xstate"]
}Then configure the rules you want to use under the rules section.
{
"rules": {
"xstate/spawn-usage": "error",
"xstate/no-infinite-loop": "error",
"xstate/no-imperative-action": "error",
"xstate/no-ondone-outside-compound-state": "error",
"xstate/invoke-usage": "error",
"xstate/entry-exit-action": "error",
"xstate/prefer-always": "error",
"xstate/no-misplaced-on-transition": "error",
"xstate/no-invalid-transition-props": "error",
"xstate/no-invalid-state-props": "error",
"xstate/no-async-guard": "error",
"xstate/event-names": ["warn", "macroCase"],
"xstate/state-names": ["warn", "camelCase"],
"xstate/no-inline-implementation": "warn",
"xstate/no-auto-forward": "warn"
}
}Shareable Configurations
This plugin exports a recommended configuration which checks for common mistakes. To enable this configuration use the extends property in your .eslintrc.js config file:
{
"extends": ["plugin:xstate/recommended"]
}There is also an all configuration which includes every available rule. It enforces both correct usage and best XState practices.
{
"extends": ["plugin:xstate/all"]
}Supported Rules
Possible Errors
| Rule | Description | Recommended |
|---|---|---|
| spawn-usage | Enforce correct usage of spawn |
|
| no-infinite-loop | Detect infinite loops with eventless transitions | |
| no-imperative-action | Forbid using action creators imperatively | |
| no-ondone-outside-compound-state | Forbid onDone transitions on atomic, history and final nodes |
|
| invoke-usage | Enforce correct invocation of services | |
| entry-exit-action | Forbid invalid declarations of entry/exit actions | |
| no-misplaced-on-transition | Forbid invalid declarations of on transitions |
|
| no-invalid-transition-props | Forbid invalid properties in transition declarations | |
| no-invalid-state-props | Forbid invalid properties in state node declarations | |
| no-async-guard | Forbid asynchronous guard functions |
Best Practices
| Rule | Description | Recommended |
|---|---|---|
| no-inline-implementation | Suggest refactoring guards, actions and services into machine options | |
| prefer-always | Suggest using the always syntax for transient (eventless) transitions |
|
| no-auto-forward | Forbid auto-forwarding events to invoked services or spawned actors |
Stylistic Issues
| Rule | Description | Recommended |
|---|---|---|
| event-names | Suggest consistent formatting of event names | |
| state-names | Suggest consistent formatting of state names and prevent confusing names |