From 1e6be262c39b6ebe14cd1d1fbaedb2548298f2ea Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C3=ABl=20Zasso?= <targos@protonmail.com>
Date: Tue, 2 Jul 2024 10:37:31 +0200
Subject: [PATCH] feat!: migrate to ESLint flat config

---
 README.md         |  26 +-
 base.js           | 608 +++++++++++++++++++++++-----------------------
 cheminfo.js       |   5 +
 eslintrc.test.yml |   1 -
 index.js          |   5 -
 jsdoc.js          |  57 +++--
 package.json      |  26 +-
 test/not-ok.js    |   2 +
 test/test.js      |  82 +++----
 unicorn.js        |  99 ++++----
 10 files changed, 459 insertions(+), 452 deletions(-)
 create mode 100644 cheminfo.js
 delete mode 100644 eslintrc.test.yml
 delete mode 100644 index.js

diff --git a/README.md b/README.md
index a5daa61..1196455 100644
--- a/README.md
+++ b/README.md
@@ -5,18 +5,22 @@ Shared ESLint config for cheminfo and ml.js projects.
 ## Installation
 
 ```console
-npm i -D eslint-config-cheminfo eslint
+npm i -D eslint-config-cheminfo eslint@^8.57.0
 ```
 
 ## Usage
 
-Create a `.eslintrc.yml` with the following contents:
+Create a `eslint.config.mjs` file with the following contents:
 
-```yml
-extends: [cheminfo, cheminfo/jsdoc, cheminfo/unicorn]
+```js
+import cheminfo from 'eslint-config-cheminfo';
+
+export default [
+  ...cheminfo,
+];
 ```
 
-You can then customize the config for your project by changing rules in this file.
+You can then customize the config for your project.
 
 Create ESLint scripts in your `package.json`:
 
@@ -43,8 +47,12 @@ https://github.com/cheminfo/eslint-config-cheminfo-react
 
 You can extend both of the above configurations as they are compatible between each other:
 
-```yml
-extends:
-  - cheminfo-typescript
-  - cheminfo-react
+```js
+import typescript from 'eslint-config-cheminfo-typescript';
+import react from 'eslint-config-cheminfo-react';
+
+export default [
+  ...typescript,
+  ...react,
+];
 ```
diff --git a/base.js b/base.js
index 6de0a2e..3600de3 100644
--- a/base.js
+++ b/base.js
@@ -1,320 +1,322 @@
-'use strict';
+import _import from 'eslint-plugin-import';
+import noLookaheadLookbehindRegexp from 'eslint-plugin-no-lookahead-lookbehind-regexp';
+import { fixupPluginRules } from '@eslint/compat';
+import globals from 'globals';
 
-module.exports = {
-  env: {
-    es6: true,
-    es2022: true,
-    'shared-node-browser': true,
-  },
-  parserOptions: {
-    ecmaVersion: '2022',
-    sourceType: 'module',
-  },
-  plugins: ['import', 'no-lookahead-lookbehind-regexp'],
-  reportUnusedDisableDirectives: true,
-  overrides: [
-    {
-      // .cjs files are always for Node.js and must be of type script.
-      files: ['*.cjs'],
-      parserOptions: {
-        sourceType: 'script',
-      },
-      env: {
-        node: true,
-      },
+export default [
+  {
+    plugins: {
+      import: fixupPluginRules(_import),
+      'no-lookahead-lookbehind-regexp': noLookaheadLookbehindRegexp,
     },
-    {
-      // .mjs files must be of type module.
-      files: ['*.mjs'],
-      parserOptions: {
-        sourceType: 'module',
-      },
+
+    linterOptions: {
+      reportUnusedDisableDirectives: true,
     },
-    {
-      // Configuration files are usually for Node.js modules.
-      files: ['*.config.{js,cjs,mjs,ts,cts,mts}'],
-      env: {
-        node: true,
+
+    languageOptions: {
+      globals: {
+        ...globals['shared-node-browser'],
       },
     },
-  ],
-  rules: {
-    // https://eslint.org/docs/latest/rules/
-    // Last rules review: v8.56.0
 
-    // https://github.com/import-js/eslint-plugin-import#rules
-    // Last rules review: v2.26.0
+    rules: {
+      // https://eslint.org/docs/latest/rules/
+      // Last rules review: v8.56.0
+
+      // https://github.com/import-js/eslint-plugin-import#rules
+      // Last rules review: v2.26.0
 
-    //#region Possible Problems (https://eslint.org/docs/latest/rules/#possible-problems)
-    'array-callback-return': 'error',
-    'constructor-super': 'error',
-    'for-direction': 'error',
-    'getter-return': 'error',
-    'no-async-promise-executor': 'error',
-    'no-await-in-loop': 'error',
-    'no-class-assign': 'error',
-    'no-compare-neg-zero': 'error',
-    'no-cond-assign': 'error',
-    'no-const-assign': 'error',
-    'no-constant-binary-expression': 'error',
-    'no-constant-condition': ['error', { checkLoops: false }],
-    'no-constructor-return': 'error',
-    'no-control-regex': 'error',
-    'no-debugger': 'error',
-    'no-dupe-args': 'error',
-    'no-dupe-class-members': 'error',
-    'no-dupe-else-if': 'error',
-    'no-dupe-keys': 'error',
-    'no-duplicate-case': 'error',
-    'no-duplicate-imports': 'off',
-    'no-empty-character-class': 'error',
-    'no-empty-pattern': 'error',
-    'no-ex-assign': 'error',
-    'no-fallthrough': 'error',
-    'no-func-assign': 'error',
-    'no-import-assign': 'error',
-    'no-inner-declarations': 'error',
-    'no-invalid-regexp': 'error',
-    'no-irregular-whitespace': 'error',
-    'no-loss-of-precision': 'error',
-    'no-misleading-character-class': 'error',
-    'no-new-native-nonconstructor': 'error',
-    'no-new-symbol': 'error',
-    'no-obj-calls': 'error',
-    'no-promise-executor-return': 'error',
-    'no-prototype-builtins': 'error',
-    'no-self-assign': 'error',
-    'no-self-compare': 'error',
-    'no-setter-return': 'error',
-    'no-sparse-arrays': 'error',
-    'no-template-curly-in-string': 'error',
-    'no-this-before-super': 'error',
-    'no-undef': 'error',
-    'no-unexpected-multiline': 'error',
-    'no-unmodified-loop-condition': 'error',
-    'no-unreachable': 'error',
-    'no-unreachable-loop': 'error',
-    'no-unsafe-finally': 'error',
-    'no-unsafe-negation': 'error',
-    'no-unsafe-optional-chaining': 'error',
-    'no-unused-private-class-members': 'error',
-    'no-unused-vars': 'error',
-    'no-use-before-define': 'off',
-    'no-useless-backreference': 'error',
-    'require-atomic-updates': ['error', { allowProperties: true }],
-    'use-isnan': 'error',
-    'valid-typeof': 'error',
-    //#endregion
+      //#region Possible Problems (https://eslint.org/docs/latest/rules/#possible-problems)
+      'array-callback-return': 'error',
+      'constructor-super': 'error',
+      'for-direction': 'error',
+      'getter-return': 'error',
+      'no-async-promise-executor': 'error',
+      'no-await-in-loop': 'error',
+      'no-class-assign': 'error',
+      'no-compare-neg-zero': 'error',
+      'no-cond-assign': 'error',
+      'no-const-assign': 'error',
+      'no-constant-binary-expression': 'error',
+      'no-constant-condition': ['error', { checkLoops: false }],
+      'no-constructor-return': 'error',
+      'no-control-regex': 'error',
+      'no-debugger': 'error',
+      'no-dupe-args': 'error',
+      'no-dupe-class-members': 'error',
+      'no-dupe-else-if': 'error',
+      'no-dupe-keys': 'error',
+      'no-duplicate-case': 'error',
+      'no-duplicate-imports': 'off',
+      'no-empty-character-class': 'error',
+      'no-empty-pattern': 'error',
+      'no-ex-assign': 'error',
+      'no-fallthrough': 'error',
+      'no-func-assign': 'error',
+      'no-import-assign': 'error',
+      'no-inner-declarations': 'error',
+      'no-invalid-regexp': 'error',
+      'no-irregular-whitespace': 'error',
+      'no-loss-of-precision': 'error',
+      'no-misleading-character-class': 'error',
+      'no-new-native-nonconstructor': 'error',
+      'no-new-symbol': 'error',
+      'no-obj-calls': 'error',
+      'no-promise-executor-return': 'error',
+      'no-prototype-builtins': 'error',
+      'no-self-assign': 'error',
+      'no-self-compare': 'error',
+      'no-setter-return': 'error',
+      'no-sparse-arrays': 'error',
+      'no-template-curly-in-string': 'error',
+      'no-this-before-super': 'error',
+      'no-undef': 'error',
+      'no-unexpected-multiline': 'error',
+      'no-unmodified-loop-condition': 'error',
+      'no-unreachable': 'error',
+      'no-unreachable-loop': 'error',
+      'no-unsafe-finally': 'error',
+      'no-unsafe-negation': 'error',
+      'no-unsafe-optional-chaining': 'error',
+      'no-unused-private-class-members': 'error',
+      'no-unused-vars': 'error',
+      'no-use-before-define': 'off',
+      'no-useless-backreference': 'error',
+      'require-atomic-updates': ['error', { allowProperties: true }],
+      'use-isnan': 'error',
+      'valid-typeof': 'error',
+      //#endregion
 
-    //#region Suggestions (https://eslint.org/docs/latest/rules/#suggestions)
-    'accessor-pairs': 'off',
-    'arrow-body-style': 'off',
-    'block-scoped-var': 'error',
-    camelcase: ['error', { properties: 'always', ignoreDestructuring: true }],
-    'capitalized-comments': 'off',
-    'class-methods-use-this': 'off',
-    complexity: 'off',
-    'consistent-return': 'off',
-    'consistent-this': 'off',
-    curly: ['error', 'multi-line', 'consistent'],
-    'default-case': 'error',
-    'default-case-last': 'error',
-    'default-param-last': 'error',
-    'dot-notation': 'error',
-    eqeqeq: ['error', 'allow-null'],
-    'func-name-matching': 'off',
-    'func-names': 'error',
-    'func-style': 'off',
-    'grouped-accessor-pairs': 'error',
-    'guard-for-in': 'off',
-    'id-denylist': 'off',
-    'id-length': 'off',
-    'id-match': 'off',
-    'init-declarations': 'off',
-    'logical-assignment-operators': 'off',
-    'max-classes-per-file': 'off',
-    'max-depth': 'off',
-    'max-lines': 'off',
-    'max-lines-per-function': 'off',
-    'max-nested-callbacks': 'off',
-    'max-params': 'off',
-    'max-statements': 'off',
-    'multiline-comment-style': 'off',
-    'new-cap': 'error',
-    'no-alert': 'error',
-    'no-array-constructor': 'error',
-    'no-bitwise': 'off',
-    'no-caller': 'error',
-    'no-case-declarations': 'error',
-    'no-console': 'error',
-    'no-continue': 'off',
-    'no-delete-var': 'error',
-    'no-div-regex': 'error',
-    'no-else-return': 'off',
-    'no-empty': 'error',
-    'no-empty-function': 'warn',
-    'no-empty-static-block': 'error',
-    'no-eq-null': 'off',
-    'no-eval': 'error',
-    'no-extend-native': 'error',
-    'no-extra-bind': 'error',
-    'no-extra-boolean-cast': 'error',
-    'no-extra-label': 'error',
-    'no-global-assign': 'error',
-    'no-implicit-coercion': 'off',
-    'no-implicit-globals': 'error',
-    'no-implied-eval': 'error',
-    'no-inline-comments': 'off',
-    'no-invalid-this': 'error',
-    'no-iterator': 'error',
-    'no-label-var': 'error',
-    'no-labels': 'off',
-    'no-lone-blocks': 'error',
-    'no-lonely-if': 'error',
-    'no-loop-func': 'error',
-    'no-magic-numbers': 'off',
-    'no-multi-assign': 'error',
-    'no-multi-str': 'error',
-    'no-negated-condition': 'off',
-    'no-nested-ternary': 'off',
-    'no-new': 'error',
-    'no-new-func': 'error',
-    'no-new-wrappers': 'error',
-    'no-nonoctal-decimal-escape': 'error',
-    'no-object-constructor': 'error',
-    'no-octal': 'error',
-    'no-octal-escape': 'error',
-    'no-param-reassign': 'off',
-    'no-plusplus': 'off',
-    'no-proto': 'error',
-    'no-redeclare': 'error',
-    'no-regex-spaces': 'error',
-    'no-restricted-exports': 'off',
-    'no-restricted-globals': 'off',
-    'no-restricted-imports': 'off',
-    'no-restricted-properties': 'off',
-    'no-restricted-syntax': 'off',
-    'no-return-assign': 'error',
-    'no-script-url': 'error',
-    'no-sequences': 'error',
-    'no-shadow': 'off',
-    'no-shadow-restricted-names': 'error',
-    'no-ternary': 'off',
-    'no-throw-literal': 'error',
-    'no-undef-init': 'error',
-    'no-undefined': 'off',
-    'no-underscore-dangle': 'off',
-    'no-unneeded-ternary': 'error',
-    'no-unused-expressions': 'error',
-    'no-unused-labels': 'error',
-    'no-useless-call': 'error',
-    'no-useless-catch': 'error',
-    'no-useless-computed-key': 'error',
-    'no-useless-concat': 'error',
-    'no-useless-constructor': 'error',
-    'no-useless-escape': 'error',
-    'no-useless-rename': 'error',
-    'no-useless-return': 'error',
-    'no-var': 'error',
-    // Conflicts with typescript-eslint's no-floating-promises rule.
-    'no-void': 'off',
-    'no-warning-comments': 'warn',
-    'no-with': 'error',
-    'object-shorthand': 'error',
-    'one-var': ['error', { initialized: 'never' }],
-    'operator-assignment': 'off',
-    'prefer-arrow-callback': 'off',
-    'prefer-const': 'off',
-    'prefer-destructuring': 'off',
-    'prefer-exponentiation-operator': 'error',
-    'prefer-named-capture-group': 'warn',
-    'prefer-numeric-literals': 'error',
-    'prefer-object-has-own': 'error',
-    'prefer-object-spread': 'error',
-    'prefer-promise-reject-errors': 'error',
-    'prefer-regex-literals': 'error',
-    'prefer-rest-params': 'error',
-    'prefer-spread': 'error',
-    'prefer-template': 'error',
-    radix: 'error',
-    'require-await': 'off',
-    'require-unicode-regexp': 'off',
-    'require-yield': 'error',
-    'sort-imports': 'off',
-    'sort-keys': 'off',
-    'sort-vars': 'off',
-    strict: ['error', 'global'],
-    'symbol-description': 'error',
-    'vars-on-top': 'off',
-    yoda: 'error',
-    //#endregion
+      //#region Suggestions (https://eslint.org/docs/latest/rules/#suggestions)
+      'accessor-pairs': 'off',
+      'arrow-body-style': 'off',
+      'block-scoped-var': 'error',
+      camelcase: ['error', { properties: 'always', ignoreDestructuring: true }],
+      'capitalized-comments': 'off',
+      'class-methods-use-this': 'off',
+      complexity: 'off',
+      'consistent-return': 'off',
+      'consistent-this': 'off',
+      curly: ['error', 'multi-line', 'consistent'],
+      'default-case': 'error',
+      'default-case-last': 'error',
+      'default-param-last': 'error',
+      'dot-notation': 'error',
+      eqeqeq: ['error', 'allow-null'],
+      'func-name-matching': 'off',
+      'func-names': 'error',
+      'func-style': 'off',
+      'grouped-accessor-pairs': 'error',
+      'guard-for-in': 'off',
+      'id-denylist': 'off',
+      'id-length': 'off',
+      'id-match': 'off',
+      'init-declarations': 'off',
+      'logical-assignment-operators': 'off',
+      'max-classes-per-file': 'off',
+      'max-depth': 'off',
+      'max-lines': 'off',
+      'max-lines-per-function': 'off',
+      'max-nested-callbacks': 'off',
+      'max-params': 'off',
+      'max-statements': 'off',
+      'multiline-comment-style': 'off',
+      'new-cap': 'error',
+      'no-alert': 'error',
+      'no-array-constructor': 'error',
+      'no-bitwise': 'off',
+      'no-caller': 'error',
+      'no-case-declarations': 'error',
+      'no-console': 'error',
+      'no-continue': 'off',
+      'no-delete-var': 'error',
+      'no-div-regex': 'error',
+      'no-else-return': 'off',
+      'no-empty': 'error',
+      'no-empty-function': 'warn',
+      'no-empty-static-block': 'error',
+      'no-eq-null': 'off',
+      'no-eval': 'error',
+      'no-extend-native': 'error',
+      'no-extra-bind': 'error',
+      'no-extra-boolean-cast': 'error',
+      'no-extra-label': 'error',
+      'no-global-assign': 'error',
+      'no-implicit-coercion': 'off',
+      'no-implicit-globals': 'error',
+      'no-implied-eval': 'error',
+      'no-inline-comments': 'off',
+      'no-invalid-this': 'error',
+      'no-iterator': 'error',
+      'no-label-var': 'error',
+      'no-labels': 'off',
+      'no-lone-blocks': 'error',
+      'no-lonely-if': 'error',
+      'no-loop-func': 'error',
+      'no-magic-numbers': 'off',
+      'no-multi-assign': 'error',
+      'no-multi-str': 'error',
+      'no-negated-condition': 'off',
+      'no-nested-ternary': 'off',
+      'no-new': 'error',
+      'no-new-func': 'error',
+      'no-new-wrappers': 'error',
+      'no-nonoctal-decimal-escape': 'error',
+      'no-object-constructor': 'error',
+      'no-octal': 'error',
+      'no-octal-escape': 'error',
+      'no-param-reassign': 'off',
+      'no-plusplus': 'off',
+      'no-proto': 'error',
+      'no-redeclare': 'error',
+      'no-regex-spaces': 'error',
+      'no-restricted-exports': 'off',
+      'no-restricted-globals': 'off',
+      'no-restricted-imports': 'off',
+      'no-restricted-properties': 'off',
+      'no-restricted-syntax': 'off',
+      'no-return-assign': 'error',
+      'no-script-url': 'error',
+      'no-sequences': 'error',
+      'no-shadow': 'off',
+      'no-shadow-restricted-names': 'error',
+      'no-ternary': 'off',
+      'no-throw-literal': 'error',
+      'no-undef-init': 'error',
+      'no-undefined': 'off',
+      'no-underscore-dangle': 'off',
+      'no-unneeded-ternary': 'error',
+      'no-unused-expressions': 'error',
+      'no-unused-labels': 'error',
+      'no-useless-call': 'error',
+      'no-useless-catch': 'error',
+      'no-useless-computed-key': 'error',
+      'no-useless-concat': 'error',
+      'no-useless-constructor': 'error',
+      'no-useless-escape': 'error',
+      'no-useless-rename': 'error',
+      'no-useless-return': 'error',
+      'no-var': 'error',
+      // Conflicts with typescript-eslint's no-floating-promises rule.
+      'no-void': 'off',
+      'no-warning-comments': 'warn',
+      'no-with': 'error',
+      'object-shorthand': 'error',
+      'one-var': ['error', { initialized: 'never' }],
+      'operator-assignment': 'off',
+      'prefer-arrow-callback': 'off',
+      'prefer-const': 'off',
+      'prefer-destructuring': 'off',
+      'prefer-exponentiation-operator': 'error',
+      'prefer-named-capture-group': 'warn',
+      'prefer-numeric-literals': 'error',
+      'prefer-object-has-own': 'error',
+      'prefer-object-spread': 'error',
+      'prefer-promise-reject-errors': 'error',
+      'prefer-regex-literals': 'error',
+      'prefer-rest-params': 'error',
+      'prefer-spread': 'error',
+      'prefer-template': 'error',
+      radix: 'error',
+      'require-await': 'off',
+      'require-unicode-regexp': 'off',
+      'require-yield': 'error',
+      'sort-imports': 'off',
+      'sort-keys': 'off',
+      'sort-vars': 'off',
+      strict: ['error', 'global'],
+      'symbol-description': 'error',
+      'vars-on-top': 'off',
+      yoda: 'error',
+      //#endregion
 
-    //#region Layout & Formatting (https://eslint.org/docs/latest/rules/#layout--formatting)
-    'line-comment-position': 'off',
-    'unicode-bom': 'error',
-    //#endregion
+      //#region Layout & Formatting (https://eslint.org/docs/latest/rules/#layout--formatting)
+      'line-comment-position': 'off',
+      'unicode-bom': 'error',
+      //#endregion
 
-    //#region Import plugin (https://github.com/import-js/eslint-plugin-import#rules)
-    // Static analysis
-    'import/named': 'error',
-    'import/default': 'warn',
-    'import/namespace': 'error',
-    'import/no-absolute-path': 'error',
-    'import/no-webpack-loader-syntax': 'error',
-    'import/no-self-import': 'error',
-    'import/no-useless-path-segments': 'error',
+      //#region Import plugin (https://github.com/import-js/eslint-plugin-import#rules)
+      // Static analysis
+      'import/named': 'error',
+      'import/default': 'warn',
+      'import/namespace': 'error',
+      'import/no-absolute-path': 'error',
+      'import/no-webpack-loader-syntax': 'error',
+      'import/no-self-import': 'error',
+      'import/no-useless-path-segments': 'error',
 
-    // Helpful warnings
-    'import/export': 'error',
-    'import/no-named-as-default-member': 'error',
-    'import/no-deprecated': 'warn',
+      // Helpful warnings
+      'import/export': 'error',
+      'import/no-named-as-default-member': 'error',
+      'import/no-deprecated': 'warn',
 
-    // Module systems
-    'import/no-amd': 'error',
+      // Module systems
+      'import/no-amd': 'error',
 
-    // Style guide
-    'import/first': 'error',
-    'import/no-duplicates': 'error',
-    'import/order': [
-      'warn',
-      {
-        groups: [
-          'builtin',
-          'external',
-          'internal',
-          'parent',
-          'sibling',
-          'index',
-        ],
-        'newlines-between': 'always',
-        alphabetize: {
-          order: 'asc',
+      // Style guide
+      'import/first': 'error',
+      'import/no-duplicates': 'error',
+      'import/order': [
+        'warn',
+        {
+          groups: [
+            'builtin',
+            'external',
+            'internal',
+            'parent',
+            'sibling',
+            'index',
+          ],
+          'newlines-between': 'always',
+          alphabetize: {
+            order: 'asc',
+          },
         },
+      ],
+      'import/newline-after-import': 'error',
+      'import/no-unassigned-import': [
+        'warn',
+        {
+          allow: [
+            'make-promises-safe',
+            'node-report',
+            'reflect-metadata',
+            '**/*.css',
+            'react-app-polyfill/*',
+          ],
+        },
+      ],
+      'import/no-named-default': 'error',
+      //#endregion
+
+      //#region No lookbehind plugin (https://github.com/JonasBa/eslint-plugin-no-lookahead-lookbehind-regexp)
+      'no-lookahead-lookbehind-regexp/no-lookahead-lookbehind-regexp': [
+        'error',
+        'no-lookbehind',
+        'no-negative-lookbehind',
+        { browserslist: false },
+      ],
+      //#endregion
+    },
+  },
+  {
+    // .cjs files are always for Node.js.
+    files: ['**/*.cjs'],
+    languageOptions: {
+      globals: {
+        ...globals.node,
       },
-    ],
-    'import/newline-after-import': 'error',
-    'import/no-unassigned-import': [
-      'warn',
-      {
-        allow: [
-          'make-promises-safe',
-          'node-report',
-          'reflect-metadata',
-          '**/*.css',
-          'react-app-polyfill/*',
-        ],
+      sourceType: 'commonjs',
+    },
+  },
+  {
+    // Configuration files are usually for Node.js modules.
+    files: ['**/*.config.{js,cjs,mjs,ts,cts,mts}'],
+    languageOptions: {
+      globals: {
+        ...globals.node,
       },
-    ],
-    'import/no-named-default': 'error',
-    //#endregion
-
-    //#region No lookbehind plugin (https://github.com/JonasBa/eslint-plugin-no-lookahead-lookbehind-regexp)
-    'no-lookahead-lookbehind-regexp/no-lookahead-lookbehind-regexp': [
-      'error',
-      'no-lookbehind',
-      'no-negative-lookbehind',
-      { browserslist: false },
-    ],
-    //#endregion
+    },
   },
-};
+];
diff --git a/cheminfo.js b/cheminfo.js
new file mode 100644
index 0000000..6394f29
--- /dev/null
+++ b/cheminfo.js
@@ -0,0 +1,5 @@
+import base from './base.js';
+import jsdoc from './jsdoc.js';
+import unicorn from './unicorn.js';
+
+export default [...base, ...jsdoc, ...unicorn];
diff --git a/eslintrc.test.yml b/eslintrc.test.yml
deleted file mode 100644
index 973e558..0000000
--- a/eslintrc.test.yml
+++ /dev/null
@@ -1 +0,0 @@
-extends: ['./base.js', './jsdoc.js', './unicorn.js']
diff --git a/index.js b/index.js
deleted file mode 100644
index 94f25a9..0000000
--- a/index.js
+++ /dev/null
@@ -1,5 +0,0 @@
-'use strict';
-
-module.exports = {
-  extends: ['./base.js'],
-};
diff --git a/jsdoc.js b/jsdoc.js
index 20c9088..eaa8a37 100644
--- a/jsdoc.js
+++ b/jsdoc.js
@@ -1,33 +1,32 @@
-'use strict';
+import jsdoc from 'eslint-plugin-jsdoc';
 
-module.exports = {
-  plugins: ['jsdoc'],
-  extends: ['plugin:jsdoc/recommended'],
-  settings: {
-    jsdoc: {
-      ignoreInternal: true,
-      maxLines: 3,
-    },
-  },
-  rules: {
-    'jsdoc/require-jsdoc': [
-      'warn',
-      {
-        publicOnly: true,
+export default [
+  jsdoc.configs['flat/recommended'],
+  {
+    settings: {
+      jsdoc: {
+        ignoreInternal: true,
+        maxLines: 3,
       },
-    ],
-    'jsdoc/require-asterisk-prefix': 'warn',
-    'jsdoc/require-description': 'warn',
-    'jsdoc/require-hyphen-before-param-description': 'warn',
+    },
+    rules: {
+      'jsdoc/require-jsdoc': [
+        'warn',
+        {
+          publicOnly: true,
+        },
+      ],
+      'jsdoc/require-asterisk-prefix': 'warn',
+      'jsdoc/require-description': 'warn',
+      'jsdoc/require-hyphen-before-param-description': 'warn',
+    },
   },
-  overrides: [
-    {
-      files: ['*.{ts,tsx,cts,mts}'],
-      rules: {
-        'jsdoc/require-param-type': 'off',
-        'jsdoc/require-returns-type': 'off',
-        'jsdoc/no-types': 'warn',
-      },
+  {
+    files: ['**/*.{ts,tsx,cts,mts}'],
+    rules: {
+      'jsdoc/require-param-type': 'off',
+      'jsdoc/require-returns-type': 'off',
+      'jsdoc/no-types': 'warn',
     },
-  ],
-};
+  },
+];
diff --git a/package.json b/package.json
index 4732632..a4485ce 100644
--- a/package.json
+++ b/package.json
@@ -2,10 +2,16 @@
   "name": "eslint-config-cheminfo",
   "version": "10.0.0",
   "description": "Shared ESLint config for cheminfo and ml.js projects",
-  "main": "index.js",
+  "type": "module",
+  "exports": {
+    ".": "./cheminfo.js",
+    "./base": "./base.js",
+    "./jsdoc": "./jsdoc.js",
+    "./unicorn": "./unicorn.js"
+  },
   "files": [
+    "cheminfo.js",
     "base.js",
-    "index.js",
     "jsdoc.js",
     "unicorn.js"
   ],
@@ -23,19 +29,19 @@
     "url": "https://github.com/cheminfo/eslint-config/issues"
   },
   "homepage": "https://github.com/cheminfo/eslint-config#readme",
-  "peerDependencies": {
-    "eslint": "^8.57.0",
+  "dependencies": {
+    "@eslint/compat": "^1.1.0",
     "eslint-plugin-import": "^2.29.1",
     "eslint-plugin-jsdoc": "^48.5.0",
-    "eslint-plugin-no-lookahead-lookbehind-regexp": "0.3.0",
-    "eslint-plugin-unicorn": "^54.0.0"
+    "eslint-plugin-no-lookahead-lookbehind-regexp": "^0.3.0",
+    "eslint-plugin-unicorn": "^54.0.0",
+    "globals": "^15.7.0"
+  },
+  "peerDependencies": {
+    "eslint": "^8.57.0"
   },
   "devDependencies": {
     "eslint": "8.57.0",
-    "eslint-plugin-import": "2.29.1",
-    "eslint-plugin-jsdoc": "48.5.0",
-    "eslint-plugin-no-lookahead-lookbehind-regexp": "0.3.0",
-    "eslint-plugin-unicorn": "54.0.0",
     "prettier": "^3.3.2"
   }
 }
diff --git a/test/not-ok.js b/test/not-ok.js
index c9c21e7..8f95184 100644
--- a/test/not-ok.js
+++ b/test/not-ok.js
@@ -1,5 +1,7 @@
 'use strict';
 
+import '/absolute/path';
+
 console.log('abc');
 
 let a;
diff --git a/test/test.js b/test/test.js
index 228b3e3..7835da2 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1,49 +1,39 @@
-'use strict';
-
-const assert = require('assert');
-const util = require('util');
-const { ESLint } = require('eslint');
-
-const eslint = new ESLint({ overrideConfigFile: 'eslintrc.test.yml' });
-
-eslint
-  .lintFiles(['test/ok.js', 'test/not-ok.js'])
-  .then((results) => {
-    const [okResult, notOkResult] = results;
-
-    assert.strictEqual(
-      okResult.errorCount,
-      0,
-      'ok.js should have no error: ' + util.format(okResult.messages),
-    );
-
-    assert.strictEqual(
-      okResult.warningCount,
-      0,
-      'ok.js should have no warnings: ' + util.format(okResult.messages),
-    );
-
-    const errors = notOkResult.messages
-      .filter(isError)
-      .map((error) => error.ruleId)
-      .sort();
-    assert.deepStrictEqual(errors, [
-      'no-console',
-      'no-lookahead-lookbehind-regexp/no-lookahead-lookbehind-regexp',
-      'no-redeclare',
-      'no-unused-vars',
-      'no-unused-vars',
-      'no-var',
-      'no-var',
-      'one-var',
-      'strict',
-      'unicorn/no-array-reduce',
-    ]);
-  })
-  .catch((error) => {
-    console.error(error);
-    process.exit(1);
-  });
+import assert from 'node:assert';
+import fs from 'node:fs';
+
+import { Linter } from 'eslint';
+
+import config from '../cheminfo.js';
+
+function readTestFile(filename) {
+  return fs.readFileSync(new URL(`./${filename}`, import.meta.url), 'utf8');
+}
+
+const linter = new Linter({ configType: 'flat' });
+
+const okResult = linter.verify(readTestFile('ok.js'), config);
+assert.strictEqual(okResult.length, 0, 'ok.js should have no error');
+
+const notOkResult = linter.verify(readTestFile('not-ok.js'), config);
+
+const errors = notOkResult
+  .filter(isError)
+  .map((error) => error.ruleId)
+  .sort();
+
+assert.deepStrictEqual(errors, [
+  'import/no-absolute-path',
+  'no-console',
+  'no-lookahead-lookbehind-regexp/no-lookahead-lookbehind-regexp',
+  'no-redeclare',
+  'no-unused-vars',
+  'no-unused-vars',
+  'no-var',
+  'no-var',
+  'one-var',
+  'strict',
+  'unicorn/no-array-reduce',
+]);
 
 function isError(message) {
   return message.severity === 2;
diff --git a/unicorn.js b/unicorn.js
index 00986b7..050c274 100644
--- a/unicorn.js
+++ b/unicorn.js
@@ -1,51 +1,52 @@
-'use strict';
+import unicorn from 'eslint-plugin-unicorn';
 
-module.exports = {
-  plugins: ['unicorn'],
-  extends: ['plugin:unicorn/recommended'],
-  rules: {
-    // We are not consistent enough to enable this rule.
-    'unicorn/filename-case': 'off',
-    // Flags i,j,k, etc.
-    'unicorn/prevent-abbreviations': 'off',
-    // TODO: create issue about risk (>32bit integers)
-    'unicorn/prefer-math-trunc': 'off',
-    // We prefer Array.from(x) over [...x]
-    'unicorn/prefer-spread': 'off',
-    // We prefer new Array(x).fill() over Array.from({ length: x })
-    'unicorn/no-new-array': 'off',
-    // We don't like separators after the comma
-    'unicorn/numeric-separators-style': 'off',
-    // For loop is used sometimes for performance.
-    'unicorn/no-for-loop': 'off',
-    // We use null in many places.
-    'unicorn/no-null': 'off',
-    'unicorn/switch-case-braces': 'off',
-    'unicorn/prefer-ternary': 'off',
-    'unicorn/prefer-type-error': 'off',
-    // Might want to enable in a future semver-major.
-    'unicorn/no-negated-condition': 'off',
-    'unicorn/no-useless-undefined': 'off',
-    // Conflicts with Prettier.
-    'unicorn/number-literal-case': 'off',
-    // Too early for full ESM
-    'unicorn/prefer-module': 'off',
-    // Conflicts with Prettier.
-    'unicorn/no-nested-ternary': 'off',
-    // Problematic with useOnOff
-    'unicorn/no-unreadable-array-destructuring': 'off',
-    'unicorn/prefer-regexp-test': 'off',
-    // Unfortunately too annoying on valid cases + conflicts with TS.
-    'unicorn/no-array-callback-reference': 'off',
-    // May conflict with other rule + ugly switch(0) auto-fix.
-    'unicorn/prefer-switch': 'off',
-    // Rare and problematic with APIs that have a find method.
-    'unicorn/no-array-method-this-argument': 'off',
-    // We don't use the feature.
-    'unicorn/expiring-todo-comments': 'off',
-    // Doesn't work with typescript-eslint v6 at the moment.
-    'unicorn/no-empty-file': 'off',
-    // We already have a rule for anonymous functions and tooling often does this with config.
-    'unicorn/no-anonymous-default-export': 'off',
+export default [
+  unicorn.configs['flat/recommended'],
+  {
+    rules: {
+      // We are not consistent enough to enable this rule.
+      'unicorn/filename-case': 'off',
+      // Flags i,j,k, etc.
+      'unicorn/prevent-abbreviations': 'off',
+      // TODO: create issue about risk (>32bit integers)
+      'unicorn/prefer-math-trunc': 'off',
+      // We prefer Array.from(x) over [...x].
+      'unicorn/prefer-spread': 'off',
+      // We prefer new Array(x).fill() over Array.from({ length: x }).
+      'unicorn/no-new-array': 'off',
+      // We don't like separators after the comma.
+      'unicorn/numeric-separators-style': 'off',
+      // For loop is used sometimes for performance.
+      'unicorn/no-for-loop': 'off',
+      // We use null in many places.
+      'unicorn/no-null': 'off',
+      'unicorn/switch-case-braces': 'off',
+      'unicorn/prefer-ternary': 'off',
+      'unicorn/prefer-type-error': 'off',
+      // Might want to enable in a future semver-major.
+      'unicorn/no-negated-condition': 'off',
+      'unicorn/no-useless-undefined': 'off',
+      // Conflicts with Prettier.
+      'unicorn/number-literal-case': 'off',
+      // Too early for full ESM.
+      'unicorn/prefer-module': 'off',
+      // Conflicts with Prettier.
+      'unicorn/no-nested-ternary': 'off',
+      // Problematic with useOnOff.
+      'unicorn/no-unreadable-array-destructuring': 'off',
+      'unicorn/prefer-regexp-test': 'off',
+      // Unfortunately too annoying on valid cases + conflicts with TS.
+      'unicorn/no-array-callback-reference': 'off',
+      // May conflict with other rule + ugly switch(0) auto-fix.
+      'unicorn/prefer-switch': 'off',
+      // Rare and problematic with APIs that have a find method.
+      'unicorn/no-array-method-this-argument': 'off',
+      // We don't use the feature.
+      'unicorn/expiring-todo-comments': 'off',
+      // Doesn't work with typescript-eslint v6 at the moment.
+      'unicorn/no-empty-file': 'off',
+      // We already have a rule for anonymous functions and tooling often does this with config.
+      'unicorn/no-anonymous-default-export': 'off',
+    },
   },
-};
+];