Add ESLint and MDX plugin

Author: danbarr

eslint.config.mjs

@@ -0,0 +1,35 @@
+import globals from 'globals';
+import pluginJs from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import pluginReact from 'eslint-plugin-react';
+import eslintConfigPrettier from 'eslint-config-prettier';
+import * as mdx from 'eslint-plugin-mdx';
+
+/** @type {import('eslint').Linter.Config[]} */
+export default [
+  { ignores: ['.docusaurus/', 'build/', 'node_modules/'] },
+  { files: ['**/*.{js,mjs,cjs,ts,jsx,tsx}'] },
+  { languageOptions: { globals: globals.node } },
+  pluginJs.configs.recommended,
+  ...tseslint.configs.recommended,
+  pluginReact.configs.flat.recommended,
+  eslintConfigPrettier,
+  {
+    ...mdx.flat,
+    processor: mdx.createRemarkProcessor({
+      lintCodeBlocks: false,
+      languageMapper: {},
+    }),
+    rules: {
+      ...mdx.flat.rules,
+      'react/no-unescaped-entities': 'off',
+    },
+  },
+  {
+    settings: {
+      react: {
+        version: 'detect',
+      },
+    },
+  },
+];