Upgrade to ESLint 9

.prettierrc.js

@@ -1 +1,3 @@
-module.exports = require('./src/prettier.config');
+import baseConfig from './src/prettier.config.js';
+
+export default baseConfig;

README.md

@@ -61,27 +61,28 @@ commit:
 
 ## Configure ESLint
 
-To configure [ESLint](https://eslint.org/), add the following to your
-`package.json` file. This will allow ESLint to discover the configuration this
-repository provides from within your `node_modules` folder, and will check
-your `*.js`, `*.ts`, and `*.tsx` files for infractions every time you create a
-new commit:
+To configure [ESLint](https://eslint.org/), import our flat config and add it
+to your `eslint.config.js` file:
+
+```js
+import baseConfig from '@actinc/eslint-config';
+
+export default [
+  ...baseConfig,
+  {
+    // Your project customizations go here.
+  },
+];
+```
+
+To check your `.js(x)` and `.ts(x)` files for infractions every time you create
+a new commit, you can add the following to your `package.json` file:
 
 ```json
 ...
-"eslintConfig": {
-  ...
-  "extends": [
-    ...
-    "@actinc/eslint-config",
-    ...
-  ],
-  ...
-},
-...
 "lint-staged": {
   ...
-  "*.{js,ts,tsx}": "eslint",
+  "*.{js,jsx,ts,tsx}": "npx eslint",
   ...
 },
 ...

eslint.config.js

@@ -0,0 +1,8 @@
+import baseConfig from './src/index.js';
+
+export default [
+  ...baseConfig,
+  {
+    ignores: ['dist'],
+  },
+];

test/ReactComponent/index.tsx → examples/ReactComponent/index.tsx

@@ -1,13 +1,18 @@
 // eslint-disable-next-line import/no-extraneous-dependencies
+
 import React from 'react';
 
 const ReactComponent: React.FC = () => {
   const [index, setIndex] = React.useState(0);
 
+  // eslint-disable-next-line lodash/prefer-constant
+  const fn = (): boolean => true;
+
   return (
     <button
       onClick={(): void => {
         setIndex(index + 1);
+        fn();
       }}
       type="button"
     >

jest.config.ts

@@ -1,11 +1,11 @@
 /* eslint-disable filenames/match-exported */
 
 import { JestConfigWithTsJest } from 'ts-jest';
 
 const config: JestConfigWithTsJest = {
   moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
   preset: 'ts-jest',
-  roots: ['<rootDir>/test'],
+  roots: ['<rootDir>/examples'],
   setupFilesAfterEnv: ['./jest.setup.ts'],
   testEnvironment: 'jsdom',
   transform: {