Add eslint config, rules

Author: hyu-dev

eslint.config.mjs

@@ -1,3 +1,38 @@
+import tsParser from '@typescript-eslint/parser'
 import { configs } from 'eslint-plugin-devup'
+import jsonc from 'eslint-plugin-jsonc'
+import * as mdx from 'eslint-plugin-mdx'
+import jsonParser from 'jsonc-eslint-parser'
 
-export default configs.recommended
+export default [
+  ...configs.recommended,
+  {
+    files: ['**/*.{json,json5,jsonc}'],
+    languageOptions: { parser: jsonParser },
+    plugins: { jsonc },
+    rules: {
+      'prettier/prettier': 'off',
+      'eol-last': ['error', 'never'],
+      'no-multiple-empty-lines': ['error', { max: 0, maxEOF: 0 }],
+    },
+  },
+  {
+    ...mdx.flat,
+    files: ['**/*.{md,mdx}'],
+    processor: mdx.createRemarkProcessor({
+      lintCodeBlocks: true,
+    }),
+  },
+  {
+    ...mdx.flatCodeBlocks,
+    files: ['**/*.{md,mdx}/*.{js,jsx,ts,tsx}'],
+    languageOptions: { parser: tsParser },
+    rules: {
+      ...mdx.flatCodeBlocks.rules,
+      'react/jsx-no-undef': 'off',
+      semi: ['error', 'never'],
+      quotes: ['error', 'single', { avoidEscape: true }],
+      'react/jsx-tag-spacing': ['error', { beforeClosing: 'never' }],
+    },
+  },
+]