feat: add should-be-fine support for flat configs (#343)

.eslint-doc-generatorrc.js

@@ -0,0 +1,10 @@
+/** @type {import('eslint-doc-generator').GenerateOptions} */
+const config = {
+  ignoreConfig: [
+    'all',
+    'flat/all',
+    'flat/recommended',
+  ],
+};
+
+module.exports = config;

README.md

@@ -47,6 +47,17 @@ This library has a required `peerDependencies` listing for [`ESLint`](https://es
 
 ## Usage
 
+> [!NOTE]
+>
+> `eslint.config.js` is supported, though most of the plugin documentation still
+> currently uses `.eslintrc` syntax; compatible versions of configs are available
+> prefixed with `flat/` and may be subject to small breaking changes while ESLint
+> v9 is being finalized.
+>
+> Refer to the
+> [ESLint documentation on the new configuration file format](https://eslint.org/docs/latest/use/configure/configuration-files-new)
+> for more.
+
 Add `jest-dom` to the plugins section of your `.eslintrc.js` configuration file.
 You can omit the `eslint-plugin-` prefix:
 
@@ -78,8 +89,7 @@ This plugin exports a recommended configuration that enforces good `jest-dom`
 practices _(you can find more info about enabled rules in
 [Supported Rules section](#supported-rules))_.
 
-To enable this configuration use the `extends` property in your `.eslintrc.js`
-config file:
+To enable this configuration with `.eslintrc`, use the `extends` property:
 
 ```javascript
 module.exports = {
@@ -90,6 +100,20 @@ module.exports = {
 };
 ```
 
+To enable this configuration with `eslint.config.js`, use
+`jestDom.configs['flat/recommended']`:
+
+```javascript
+module.exports = [
+  {
+    files: [
+      /* glob matching your test files */
+    ],
+    ...require("eslint-plugin-jest-dom").configs["flat/recommended"],
+  },
+];
+```
+
 ## Supported Rules
 
 <!-- begin auto-generated rules list -->

package.json

@@ -31,7 +31,7 @@
   "scripts": {
     "build": "kcd-scripts build",
     "pregenerate-readme-table": "npm run build",
-    "generate-readme-table": "eslint-doc-generator --ignore-config all",
+    "generate-readme-table": "eslint-doc-generator",
     "lint": "kcd-scripts lint",
     "lint:generate-readme-table": "npm run generate-readme-table -- --check",
     "setup": "npm install && npm run validate -s",

src/__tests__/index.test.js

@@ -1,22 +1,81 @@
-import { generateRecommendedConfig, rules } from "../";
+import plugin, { configs, rules } from "../";
+
+it("includes the configs and rules on the plugin", () => {
+  expect(plugin).toHaveProperty("configs", configs);
+  expect(plugin).toHaveProperty("rules", rules);
+});
 
 it("should have all the rules", () => {
-  expect(Object.keys(rules).length).toBeGreaterThan(0);
+  expect(Object.keys(rules)).toHaveLength(11);
 });
 
-it.each(Object.keys(rules))("%s should export required fields", (ruleName) => {
-  const rule = rules[ruleName];
-  expect(rule).toHaveProperty("create", expect.any(Function));
-  expect(rule.meta.docs.url).not.toBe("");
-  expect(rule.meta.docs.category).toBe("Best Practices");
-  expect(rule.meta.docs.description).not.toBe("");
+it.each(Object.entries(rules))(
+  "%s should export required fields",
+  (name, rule) => {
+    expect(rule).toHaveProperty("create", expect.any(Function));
+    expect(rule.meta.docs.url).not.toBe("");
+    expect(rule.meta.docs.category).toBe("Best Practices");
+    expect(rule.meta.docs.description).not.toBe("");
+  }
+);
+
+it("has the expected recommended config", () => {
+  expect(configs.recommended).toMatchInlineSnapshot(`
+    Object {
+      plugins: Array [
+        jest-dom,
+      ],
+      rules: Object {
+        jest-dom/prefer-checked: error,
+        jest-dom/prefer-empty: error,
+        jest-dom/prefer-enabled-disabled: error,
+        jest-dom/prefer-focus: error,
+        jest-dom/prefer-in-document: error,
+        jest-dom/prefer-required: error,
+        jest-dom/prefer-to-have-attribute: error,
+        jest-dom/prefer-to-have-class: error,
+        jest-dom/prefer-to-have-style: error,
+        jest-dom/prefer-to-have-text-content: error,
+        jest-dom/prefer-to-have-value: error,
+      },
+    }
+  `);
 });
 
-it("should have a recommended config with recommended rules", () => {
-  expect(
-    generateRecommendedConfig({
-      good: { meta: { docs: { recommended: true } } },
-      bad: { meta: { docs: { recommended: false } } },
-    })
-  ).toEqual({ "jest-dom/good": "error" });
+it("has the expected recommended flat config", () => {
+  const expectJestDomPlugin = expect.objectContaining({
+    meta: {
+      name: "eslint-plugin-jest-dom",
+      version: expect.any(String),
+    },
+  });
+
+  expect(configs["flat/recommended"]).toMatchInlineSnapshot(
+    { plugins: { "jest-dom": expectJestDomPlugin } },
+    `
+    Object {
+      plugins: Object {
+        jest-dom: ObjectContaining {
+          meta: Object {
+            name: eslint-plugin-jest-dom,
+            version: Any<String>,
+          },
+        },
+      },
+      rules: Object {
+        jest-dom/prefer-checked: error,
+        jest-dom/prefer-empty: error,
+        jest-dom/prefer-enabled-disabled: error,
+        jest-dom/prefer-focus: error,
+        jest-dom/prefer-in-document: error,
+        jest-dom/prefer-required: error,
+        jest-dom/prefer-to-have-attribute: error,
+        jest-dom/prefer-to-have-class: error,
+        jest-dom/prefer-to-have-style: error,
+        jest-dom/prefer-to-have-text-content: error,
+        jest-dom/prefer-to-have-value: error,
+      },
+    }
+  `
+  );
 });

src/index.js

@@ -8,39 +8,58 @@
 //------------------------------------------------------------------------------
 
 import requireIndex from "requireindex";
+import {
+  name as packageName,
+  version as packageVersion,
+} from "../package.json";
 
 //------------------------------------------------------------------------------
 // Plugin Definition
 //------------------------------------------------------------------------------
 
-// import all rules in src/rules
+// import all rules in src/rules and re-export them for .eslintrc configs
 export const rules = requireIndex(`${__dirname}/rules`);
 
-export const generateRecommendedConfig = (allRules) =>
-  Object.entries(allRules).reduce(
-    (memo, [name, rule]) => ({
-      ...memo,
-      ...(rule.meta.docs.recommended ? { [`jest-dom/${name}`]: "error" } : {}),
-    }),
-    {}
-  );
-
-export const generateAllRulesConfig = (allRules) =>
-  Object.entries(allRules).reduce(
-    (memo, [name]) => ({
-      ...memo,
-      ...{ [`jest-dom/${name}`]: "error" },
-    }),
-    {}
-  );
-
-export const configs = {
-  recommended: {
-    plugins: ["jest-dom"],
-    rules: generateRecommendedConfig(rules),
+const allRules = Object.entries(rules).reduce(
+  (memo, [name]) => ({
+    ...memo,
+    ...{ [`jest-dom/${name}`]: "error" },
+  }),
+  {}
+);
+
+const recommendedRules = allRules;
+
+const plugin = {
+  meta: {
+    name: packageName,
+    version: packageVersion,
   },
-  all: {
-    plugins: ["jest-dom"],
-    rules: generateAllRulesConfig(rules),
+  configs: {
+    recommended: {
+      plugins: ["jest-dom"],
+      rules: recommendedRules,
+    },
+    all: {
+      plugins: ["jest-dom"],
+      rules: allRules,
+    },
   },
+  rules,
+};
+
+plugin.configs["flat/recommended"] = {
+  plugins: { "jest-dom": plugin },
+  rules: recommendedRules,
 };
+plugin.configs["flat/all"] = {
+  plugins: { "jest-dom": plugin },
+  rules: allRules,
+};
+
+export default plugin;
+
+// explicitly export config to allow using this plugin in CJS-based
+// eslint.config.js files without needing to deal with the .default
+// and also retain backwards compatibility with `.eslintrc` configs
+export const configs = plugin.configs;