Update dependencies and add smoke tests

.github/workflows/ci.js.yml

@@ -0,0 +1,27 @@
+name: config tests
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  smoke:
+    runs-on: ubuntu-22.04
+
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - name: Enable corepack to fix https://github.com/actions/setup-node/pull/901
+        run: corepack enable pnpm
+
+      - name: Use Node.js LTS (22.x)
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020
+        with:
+          node-version: 22.x
+          cache: 'pnpm'
+
+      - name: Install project dependencies
+        run: corepack pnpm install --frozen-lockfile
+
+      - name: Run tests
+        run: corepack pnpm test

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## 0.9.0
+
+- Update dependencies
+- Add smoke tests
+
 ## 0.8.1
 
 - Fix unsaved maintainers.mjs change

fixtures/config/babel.config.cjs

@@ -0,0 +1,4 @@
+module.exports = {
+  presets: ['@exercism/babel-preset-javascript'],
+  plugins: [],
+};

fixtures/config/eslint.config.mjs

@@ -0,0 +1,11 @@
+import config from '../../index.mjs';
+
+const [rules, ...rest] = config;
+
+export default [
+  {
+    ...rules,
+    files: ['*.{js,mjs,cjs}*'],
+  },
+  ...rest,
+];

fixtures/config/failing.mjs

@@ -0,0 +1,26 @@
+// https://eslint.org/docs/latest/rules/array-callback-return
+// Expect: Array.prototype.reduce() expects a return value from function.
+const _indexMap = [].reduce(function (memo, item, index) {
+  memo[item] = index;
+}, {});
+
+// Expect: Array.from() expects a value to be returned at the end of function
+const foo = Array.from([], function (node) {
+  if (node.tagName === 'DIV') {
+    return true;
+  }
+});
+
+const _bar = foo.filter(function (x) {
+  if (x) {
+    return true;
+  } else {
+    // Expect: Array.prototype.filter() expects a return value from function.
+    return;
+  }
+});
+
+// Expect: no error
+[].forEach(function (item) {
+  return item;
+});

fixtures/config/passing.mjs

@@ -0,0 +1,23 @@
+// https://eslint.org/docs/latest/rules/array-callback-return
+[].forEach(function (item) {
+  return item;
+});
+
+const _indexMap = [].reduce(function (memo, item, index) {
+  memo[item] = index;
+  return memo;
+}, {});
+
+const foo = Array.from([], function (node) {
+  if (node.tagName === 'DIV') {
+    return true;
+  }
+  return false;
+});
+
+const _bar = foo.map((node) => node.getAttribute('id'));
+
+// Expect: no error
+[].forEach(function (item) {
+  return item;
+});

fixtures/maintainers/babel.config.cjs

@@ -0,0 +1,4 @@
+module.exports = {
+  presets: ['@exercism/babel-preset-javascript'],
+  plugins: [],
+};

fixtures/maintainers/eslint.config.mjs

@@ -0,0 +1,11 @@
+import config from '../../maintainers.mjs';
+
+const [rules, ...rest] = config;
+
+export default [
+  {
+    ...rules,
+    files: ['*.{js,mjs,cjs}*'],
+  },
+  ...rest,
+];

fixtures/maintainers/failing.mjs

@@ -0,0 +1,26 @@
+// https://eslint.org/docs/latest/rules/array-callback-return
+// Expect: Array.prototype.reduce() expects a return value from function.
+const _indexMap = [].reduce(function (memo, item, index) {
+  memo[item] = index;
+}, {});
+
+// Expect: Array.from() expects a value to be returned at the end of function
+const foo = Array.from([], function (node) {
+  if (node.tagName === 'DIV') {
+    return true;
+  }
+});
+
+const _bar = foo.filter(function (x) {
+  if (x) {
+    return true;
+  } else {
+    // Expect: Array.prototype.filter() expects a return value from function.eslintarray-callback-return
+    return;
+  }
+});
+
+// Expect: Array.prototype.forEach() expects no useless return value from function.eslintarray-callback-return
+[].forEach(function (item) {
+  return item;
+});

fixtures/maintainers/passing.mjs

@@ -0,0 +1,18 @@
+// https://eslint.org/docs/latest/rules/array-callback-return
+[].forEach(function (item) {
+  item;
+});
+
+const _indexMap = [].reduce(function (memo, item, index) {
+  memo[item] = index;
+  return memo;
+}, {});
+
+const foo = Array.from([], function (node) {
+  if (node.tagName === 'DIV') {
+    return true;
+  }
+  return false;
+});
+
+const _bar = foo.map((node) => node.getAttribute('id'));

index.mjs

@@ -4,6 +4,7 @@ import fs from 'fs';
 import eslint from '@eslint/js';
 import jestPlugin from 'eslint-plugin-jest';
 import prettierConfig from 'eslint-config-prettier';
+import importPlugin from 'eslint-plugin-import';
 
 import globals from 'globals';
 
@@ -49,13 +50,15 @@ export default [
       'no-shadow': 'warn',
       'no-unreachable-loop': 'warn',
       'no-unsafe-optional-chaining': 'error',
+      'no-unused-vars': ['warn', { varsIgnorePattern: '^_[^_]' }],
       'require-atomic-updates': 'warn',
     },
   },
+  importPlugin.flatConfigs.recommended,
 
   {
     // enable jest rules on test files
-    files: ['test/**', '**/*.spec.js*', '**/*.test.js*'],
+    files: ['test/**', '**/*.spec.{js,mjs,cjs}*', '**/*.test.{js,mjs,cjs}*'],
     ...jestPlugin.configs['flat/recommended'],
     rules: {
       ...jestPlugin.configs['flat/recommended'].rules,
@@ -72,8 +75,5 @@ export default [
     },
   },
 
-  // https://github.com/import-js/eslint-plugin-import/pull/3018
-  // missing: import/* plugins
-
   prettierConfig,
 ];

maintainers.mjs

@@ -4,6 +4,7 @@ import fs from 'fs';
 import eslint from '@eslint/js';
 import jestPlugin from 'eslint-plugin-jest';
 import prettierConfig from 'eslint-config-prettier';
+import importPlugin from 'eslint-plugin-import';
 
 import globals from 'globals';
 
@@ -50,13 +51,15 @@ export default [
       'no-shadow': 'error',
       'no-unreachable-loop': 'error',
       'no-unsafe-optional-chaining': 'error',
+      'no-unused-vars': ['error', { varsIgnorePattern: '^_[^_]' }],
       'require-atomic-updates': 'error',
     },
   },
+  importPlugin.flatConfigs.recommended,
 
   {
     // enable jest rules on test files
-    files: ['test/**', '**/*.spec.js*', '**/*.test.js*'],
+    files: ['test/**', '**/*.spec.{js,mjs,cjs}*', '**/*.test.{js,mjs,cjs}*'],
     ...jestPlugin.configs['flat/recommended'],
     rules: {
       ...jestPlugin.configs['flat/recommended'].rules,
@@ -73,8 +76,5 @@ export default [
     },
   },
 
-  // https://github.com/import-js/eslint-plugin-import/pull/3018
-  // missing: import/* plugins
-
   prettierConfig,
 ];

package.json

@@ -1,29 +1,30 @@
 {
   "name": "@exercism/eslint-config-javascript",
-  "version": "0.8.1",
+  "version": "0.9.0",
   "description": "ESLint configuration for the JavaScript track on Exercism",
   "main": "index.mjs",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "pnpm node tests.cjs"
   },
   "author": "Derk-Jan Karrenbeld <derk-jan+git@karrenbeld.info> (https://derk-jan.com)",
   "license": "MIT",
   "peerDependencies": {
-    "@exercism/babel-preset-javascript": ">= 0.5.1",
+    "@exercism/babel-preset-javascript": ">= 0.6.0",
     "eslint": ">= 9.17"
   },
   "devDependencies": {
-    "@exercism/babel-preset-javascript": "^0.5.1",
-    "eslint": "^9.17.0",
-    "prettier": "^3.4.2"
+    "@exercism/babel-preset-javascript": "^0.6.0",
+    "eslint": "^9.28.0",
+    "prettier": "^3.5.3"
   },
   "dependencies": {
-    "@babel/eslint-parser": "^7.25.9",
-    "@babel/eslint-plugin": "^7.25.9",
-    "@eslint/js": "^9.17.0",
-    "eslint-config-prettier": "^9.1.0",
-    "eslint-plugin-jest": "^28.10.0",
-    "globals": "^15.14.0"
+    "@babel/eslint-parser": "^7.27.5",
+    "@babel/eslint-plugin": "^7.27.1",
+    "@eslint/js": "^9.28.0",
+    "eslint-config-prettier": "^10.1.5",
+    "eslint-plugin-import": "^2.31.0",
+    "eslint-plugin-jest": "^28.12.0",
+    "globals": "^16.2.0"
   },
   "packageManager": "pnpm@9.15.2"
 }