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feat: add should-be-fine support for flat configs (#1505)
* feat: support flat config * fix: redo flat config * docs: add note about flat config support * fix: handle snapshot processor * chore: remove unneeded cast * chore: exclude flat configs from docs * test: use property matches to reduce snapshot size
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‎.eslint-doc-generatorrc.js

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@@ -3,7 +3,13 @@ const { prettier: prettierRC } = require('./package.json');
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/** @type {import('eslint-doc-generator').GenerateOptions} */
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const config = {
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ignoreConfig: ['all'],
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ignoreConfig: [
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'all',
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'flat/all',
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'flat/recommended',
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'flat/style',
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'flat/snapshots',
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],
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ruleDocTitleFormat: 'desc-parens-name',
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ruleDocSectionInclude: ['Rule details'],
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ruleListColumns: [

‎README.md

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@@ -22,6 +22,15 @@ yarn add --dev eslint eslint-plugin-jest
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## Usage
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> [!NOTE]
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>
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> `eslint.config.js` is supported, though most of the plugin documentation still
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> currently uses `.eslintrc` syntax.
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>
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> Refer to the
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> [ESLint documentation on the new configuration file format](https://eslint.org/docs/latest/use/configure/configuration-files-new)
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> for more.
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Add `jest` to the plugins section of your `.eslintrc` configuration file. You
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can omit the `eslint-plugin-` prefix:
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top-level configuration as that applies to all files being linted which can
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include source files.
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You can use
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For `.eslintrc` configs you can use
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[overrides](https://eslint.org/docs/user-guide/configuring/configuration-files#how-do-overrides-work)
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to have ESLint apply additional rules to specific files:
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}
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```
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For `eslint.config.js` you can use
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[`files` and `ignores`](https://eslint.org/docs/latest/use/configure/configuration-files-new#specifying-files-and-ignores):
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```js
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const jest = require('eslint-plugin-jest');
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module.exports = [
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...require('@eslint/js').configs.recommended,
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{
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files: ['test/**'],
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...jest.configs['flat/recommended'],
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rules: {
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...jest.configs['flat/recommended'],
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'jest/prefer-expect-assertions': 'off',
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},
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},
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// you can also configure jest rules in other objects, so long as some of the `files` match
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{
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files: ['test/**'],
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rules: { 'jest/prefer-expect-assertions': 'off' },
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},
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];
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```
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### Jest `version` setting
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The behaviour of some rules (specifically [`no-deprecated-functions`][]) change
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## Shareable configurations
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> [!NOTE]
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>
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> `eslint.config.js` compatible versions of configs are available prefixed with
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> `flat/` and may be subject to small breaking changes while ESLint v9 is being
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> finalized.
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### Recommended
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This plugin exports a recommended configuration that enforces good testing
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practices.
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To enable this configuration use the `extends` property in your `.eslintrc`
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config file:
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To enable this configuration with `.eslintrc`, use the `extends` property:
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```json
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{
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"extends": ["plugin:jest/recommended"]
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}
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```
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To enable this configuration with `eslint.config.js`, use
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`jest.configs['flat/recommended']`:
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```js
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const jest = require('eslint-plugin-jest');
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module.exports = [
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{
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files: [
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/* glob matching your test files */
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],
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...jest.configs['flat/recommended'],
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},
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];
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```
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### Style
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This plugin also exports a configuration named `style`, which adds some
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}
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```
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See
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[ESLint documentation](https://eslint.org/docs/user-guide/configuring/configuration-files#extending-configuration-files)
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for more information about extending configuration files.
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To enable this configuration with `eslint.config.js`, use
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`jest.configs['flat/style']`:
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```js
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const jest = require('eslint-plugin-jest');
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module.exports = [
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{
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files: [
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/* glob matching your test files */
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],
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...jest.configs['flat/style'],
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},
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];
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```
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### All
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}
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```
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To enable this configuration with `eslint.config.js`, use
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`jest.configs['flat/all']`:
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```js
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const jest = require('eslint-plugin-jest');
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module.exports = [
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{
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files: [
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/* glob matching your test files */
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],
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...jest.configs['flat/all'],
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},
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];
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```
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While the `recommended` and `style` configurations only change in major versions
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the `all` configuration may change in any release and is thus unsuited for
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installations requiring long-term consistency.
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## Snapshot processing
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> [!NOTE]
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>
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> This is only relevant for `eslint.config.js`
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This plugin provides a
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[custom processor](https://eslint.org/docs/latest/extend/custom-processors) to
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allow rules to "lint" snapshot files.
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For `.eslintrc` based configs, this is automatically enabled out of the box but
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must be opted into for `eslint.config.js` using the `flat/snapshots` config:
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```js
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const jest = require('eslint-plugin-jest');
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module.exports = [
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{
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...jest.configs['flat/snapshots'],
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rules: {
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'jest/no-large-snapshots': ['error', { maxSize: 1 }],
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},
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},
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];
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```
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Unlike other configs, this includes a `files` array that matches `.snap` files
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meaning you can use it directly
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## Rules
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<!-- begin auto-generated rules list -->

‎src/__tests__/__snapshots__/rules.test.ts.snap

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@@ -64,6 +64,182 @@ exports[`rules should export configs that refer to actual rules 1`] = `
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"jest/valid-title": "error",
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},
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},
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"flat/all": {
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"languageOptions": {
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"globals": {
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"afterAll": false,
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"afterEach": false,
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"beforeAll": false,
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"beforeEach": false,
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"describe": false,
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"expect": false,
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"fit": false,
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"it": false,
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"jest": false,
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"test": false,
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"xdescribe": false,
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"xit": false,
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"xtest": false,
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},
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},
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"plugins": {
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"jest": ObjectContaining {
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"meta": {
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"name": "eslint-plugin-jest",
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"version": "27.8.0",
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},
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},
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},
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"rules": {
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"jest/consistent-test-it": "error",
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"jest/expect-expect": "error",
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"jest/max-expects": "error",
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"jest/max-nested-describe": "error",
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"jest/no-alias-methods": "error",
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"jest/no-commented-out-tests": "error",
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"jest/no-conditional-expect": "error",
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"jest/no-conditional-in-test": "error",
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"jest/no-confusing-set-timeout": "error",
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"jest/no-deprecated-functions": "error",
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"jest/no-disabled-tests": "error",
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"jest/no-done-callback": "error",
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"jest/no-duplicate-hooks": "error",
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"jest/no-export": "error",
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"jest/no-focused-tests": "error",
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"jest/no-hooks": "error",
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"jest/no-identical-title": "error",
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"jest/no-interpolation-in-snapshots": "error",
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"jest/no-jasmine-globals": "error",
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"jest/no-large-snapshots": "error",
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"jest/no-mocks-import": "error",
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"jest/no-restricted-jest-methods": "error",
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"jest/no-restricted-matchers": "error",
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"jest/no-standalone-expect": "error",
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"jest/no-test-prefixes": "error",
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"jest/no-test-return-statement": "error",
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"jest/no-untyped-mock-factory": "error",
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"jest/prefer-called-with": "error",
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"jest/prefer-comparison-matcher": "error",
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"jest/prefer-each": "error",
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"jest/prefer-equality-matcher": "error",
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"jest/prefer-expect-assertions": "error",
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"jest/prefer-expect-resolves": "error",
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"jest/prefer-hooks-in-order": "error",
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"jest/prefer-hooks-on-top": "error",
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"jest/prefer-lowercase-title": "error",
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"jest/prefer-mock-promise-shorthand": "error",
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"jest/prefer-snapshot-hint": "error",
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"jest/prefer-spy-on": "error",
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"jest/prefer-strict-equal": "error",
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"jest/prefer-to-be": "error",
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"jest/prefer-to-contain": "error",
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"jest/prefer-to-have-length": "error",
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"jest/prefer-todo": "error",
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"jest/require-hook": "error",
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"jest/require-to-throw-message": "error",
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"jest/require-top-level-describe": "error",
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"jest/unbound-method": "error",
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"jest/valid-describe-callback": "error",
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"jest/valid-expect": "error",
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"jest/valid-expect-in-promise": "error",
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"jest/valid-title": "error",
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},
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},
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"flat/recommended": {
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"languageOptions": {
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"globals": {
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"afterAll": false,
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"afterEach": false,
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"beforeAll": false,
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"beforeEach": false,
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"describe": false,
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"expect": false,
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"fit": false,
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"it": false,
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"jest": false,
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"test": false,
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"xdescribe": false,
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"xit": false,
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"xtest": false,
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},
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},
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"plugins": {
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"jest": ObjectContaining {
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"meta": {
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"name": "eslint-plugin-jest",
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"version": "27.8.0",
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},
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},
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},
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"rules": {
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"jest/expect-expect": "warn",
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"jest/no-alias-methods": "error",
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"jest/no-commented-out-tests": "warn",
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"jest/no-conditional-expect": "error",
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"jest/no-deprecated-functions": "error",
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"jest/no-disabled-tests": "warn",
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"jest/no-done-callback": "error",
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"jest/no-export": "error",
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"jest/no-focused-tests": "error",
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"jest/no-identical-title": "error",
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"jest/no-interpolation-in-snapshots": "error",
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"jest/no-jasmine-globals": "error",
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"jest/no-mocks-import": "error",
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"jest/no-standalone-expect": "error",
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"jest/no-test-prefixes": "error",
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"jest/valid-describe-callback": "error",
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"jest/valid-expect": "error",
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"jest/valid-expect-in-promise": "error",
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"jest/valid-title": "error",
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},
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},
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"flat/snapshots": {
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"files": [
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"**/*.snap",
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],
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"plugins": {
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"jest": ObjectContaining {
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"meta": {
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"name": "eslint-plugin-jest",
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"version": "27.8.0",
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},
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},
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},
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"processor": "jest/snapshots",
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},
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"flat/style": {
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"languageOptions": {
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"globals": {
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"afterAll": false,
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"afterEach": false,
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"beforeAll": false,
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"beforeEach": false,
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"describe": false,
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"expect": false,
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"fit": false,
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"it": false,
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"jest": false,
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"test": false,
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"xdescribe": false,
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"xit": false,
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"xtest": false,
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},
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},
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"plugins": {
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"jest": ObjectContaining {
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"meta": {
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"name": "eslint-plugin-jest",
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"version": "27.8.0",
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},
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},
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},
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"rules": {
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"jest/no-alias-methods": "warn",
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"jest/prefer-to-be": "error",
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"jest/prefer-to-contain": "error",
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"jest/prefer-to-have-length": "error",
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},
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},
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"recommended": {
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"env": {
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"jest/globals": true,

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