Migrate eslint config to 9

eslint.config.mjs

@@ -0,0 +1,14 @@
+import digabiConfig from '@digabi/eslint-config'
+
+export default [
+  {
+    ignores: ['**/*.snapshot']
+  },
+  ...digabiConfig(),
+  {
+    files: ['**/*.test.ts'],
+    rules: {
+      '@typescript-eslint/no-floating-promises': 'off'
+    }
+  }
+]

package.json

@@ -5,20 +5,20 @@
     "packages/*"
   ],
   "devDependencies": {
-    "@digabi/eslint-config": "^3.3.0",
+    "@digabi/eslint-config": "^3.4.0",
     "@digabi/typescript-config": "^1.0.2",
     "@types/node": "^24.10.9",
-    "@typescript-eslint/eslint-plugin": "^8.38.0",
-    "@typescript-eslint/parser": "^8.38.0",
-    "eslint": "^8.45.0",
+    "eslint": "^9.0.0",
     "eslint-config-prettier": "^10.1.8",
-    "eslint-plugin-import": "^2.32.0",
+    "eslint-plugin-import-x": "^4.6.0",
     "eslint-plugin-prettier": "^5.5.3",
     "eslint-plugin-promise": "^7.2.1",
+    "globals": "^16.0.0",
     "lerna": "^9.0.0",
     "prettier": "^3.6.2",
     "tsx": "^4.20.3",
-    "typescript": "^5.8.3"
+    "typescript": "^5.8.3",
+    "typescript-eslint": "^8.58.0"
   },
   "scripts": {
     "build": "lerna run build",

packages/2fa/package.json

@@ -15,7 +15,7 @@
   "scripts": {
     "build": "tsc --project ./tsconfig.build.json",
     "test": "node --test --import tsx ./__tests__/*.test.ts",
-    "lint": "tsc --noEmit && eslint --ignore-path ../../.eslintignore ./",
+    "lint": "tsc --noEmit && eslint ./",
     "prepare": "npm run build"
   },
   "keywords": [

packages/answer-utils/package.json

@@ -14,7 +14,7 @@
   "scripts": {
     "build": "tsc --project ./tsconfig.build.json",
     "test": "node --test --import tsx ./__tests__/*.test.ts",
-    "lint": "tsc --noEmit && eslint --ignore-path ../../.eslintignore ./",
+    "lint": "tsc --noEmit && eslint ./",
     "prepare": "npm run build"
   },
   "dependencies": {

packages/async-utils/package.json

@@ -14,7 +14,7 @@
   "scripts": {
     "build": "tsc --project ./tsconfig.build.json",
     "test": "node --test --import tsx ./__tests__/*.test.ts",
-    "lint": "tsc --noEmit && eslint --ignore-path ../../.eslintignore ./",
+    "lint": "tsc --noEmit && eslint ./",
     "prepare": "npm run build"
   },
   "publishConfig": {

packages/crypto-utils/package.json

@@ -15,7 +15,7 @@
   "scripts": {
     "build": "tsc --project ./tsconfig.build.json",
     "test": "node --test --import tsx ./__tests__/*.test.ts",
-    "lint": "tsc --noEmit && eslint --ignore-path ../../.eslintignore ./",
+    "lint": "tsc --noEmit && eslint ./",
     "prepare": "npm run build"
   },
   "keywords": [

packages/database-utils/package.json

@@ -17,7 +17,7 @@
   "scripts": {
     "build": "tsc --project ./tsconfig.build.json",
     "test": "TZ=UTC node --test --import tsx ./__tests__/*.test.ts",
-    "lint": "tsc --noEmit && eslint --ignore-path ../../.eslintignore ./",
+    "lint": "tsc --noEmit && eslint ./",
     "prepare": "npm run build"
   },
   "publishConfig": {

packages/eslint-config/README.md

@@ -1,30 +1,33 @@
 # eslint-config
 
-Shared ESLint config for the digabi project.
+Shared ESLint config for the digabi project. Requires ESLint 9+ and uses the flat config format.
 
 # How to add to a new project?
 
 Add the required dependencies:
 
-    $ npm install --save-dev @digabi/eslint-config @typescript-eslint/eslint-plugin @typescript-eslint/parser eslint eslint-config-prettier eslint-plugin-import eslint-plugin-prettier
+    $ npm install --save-dev @digabi/eslint-config eslint eslint-plugin-import-x eslint-plugin-prettier eslint-plugin-promise globals typescript-eslint
 
 If you're using React, add
 
-    $ npm install --save-dev eslint-plugin-react
-    $ npm install --save-dev eslint-plugin-react-hooks
+    $ npm install --save-dev eslint-plugin-react eslint-plugin-react-hooks
 
 If you're using Mocha, add
 
-    $ npm install --save-dev eslint-plugin-mocha
+    $ npm install --save-dev eslint-plugin-mocha mocha
 
 If you're using Jest, add
 
-    $ npm install --save-dev eslint-plugin-jest
+    $ npm install --save-dev eslint-plugin-jest jest
 
-Finally, add or modify `.eslintrc.json` in the project root.
+Create an `eslint.config.mjs` in the project root:
 
-```json
-{
-  "extends": "@digabi/eslint-config"
-}
+```js
+import digabiConfig from '@digabi/eslint-config'
+
+export default [
+  ...digabiConfig(),
+]
 ```
+
+The config auto-detects installed optional plugins (React, Mocha, Jest) and enables their rules automatically.

packages/eslint-config/__tests__/eslint-config.test.ts

@@ -0,0 +1,43 @@
+import { describe, test } from 'node:test'
+import { ESLint } from 'eslint'
+import digabiConfig from '../src/index.mjs'
+
+function sortKeysDeep(obj: unknown, seen = new WeakSet()): unknown {
+  if (Array.isArray(obj)) return obj.map(item => sortKeysDeep(item, seen))
+  if (obj !== null && typeof obj === 'object') {
+    if (seen.has(obj)) return '[Circular]'
+    seen.add(obj)
+    return Object.keys(obj as Record<string, unknown>)
+      .sort()
+      .reduce<Record<string, unknown>>((sorted, key) => {
+        sorted[key] = sortKeysDeep((obj as Record<string, unknown>)[key], seen)
+        return sorted
+      }, {})
+  }
+  return obj
+}
+
+function normalizeConfig(resolved: Record<string, unknown>) {
+  return sortKeysDeep(resolved)
+}
+
+function createESLint(cwd?: string) {
+  return new ESLint({
+    overrideConfigFile: true,
+    overrideConfig: digabiConfig(),
+    cwd: cwd ?? process.cwd()
+  })
+}
+
+const FILE_TYPES = ['test.js', 'test.ts', 'test.tsx', 'test.spec.ts']
+
+describe('eslint-config (all plugins enabled)', () => {
+  for (const fileType of FILE_TYPES) {
+    test(`resolved config for ${fileType}`, async t => {
+      const eslint = createESLint()
+      // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
+      const resolved: { rules: any } = await eslint.calculateConfigForFile(fileType)
+      t.assert.snapshot(normalizeConfig(resolved.rules as unknown as Record<string, unknown>))
+    })
+  }
+})