Feature/modernize v4

.eslintrc.js

@@ -0,0 +1,35 @@
+module.exports = {
+  root: true,
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    ecmaVersion: 2020,
+    sourceType: 'module',
+    ecmaFeatures: { jsx: true },
+  },
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:react/recommended',
+    'plugin:react-hooks/recommended',
+    'prettier',
+  ],
+  plugins: ['@typescript-eslint', 'react', 'react-hooks'],
+  settings: {
+    react: { version: 'detect' },
+  },
+  rules: {
+    'react/react-in-jsx-scope': 'off',
+    '@typescript-eslint/no-explicit-any': 'warn',
+    'react/prop-types': 'off',
+  },
+  overrides: [
+    {
+      files: ['**/__tests__/**'],
+      rules: {
+        '@typescript-eslint/no-explicit-any': 'off',
+        '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_' }],
+      },
+    },
+  ],
+  ignorePatterns: ['lib/', 'example/', 'node_modules/'],
+};

.gitignore

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 /node_modules
 /.idea
 package-lock.json
-/.DS_Store
+/.DS_Store
+/lib/
+*.tsbuildinfo

CHANGELOG.md

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+# Changelog
+
+## 4.0.0-alpha.0
+
+### Breaking Changes
+
+- **Minimum React 18.0.0** (was 16.2.0)
+- **Minimum React Native 0.73.0** (was 0.50.4)
+- **`react-native-fit-image` removed** - The default `image` render rule now uses React Native's built-in `<Image>` component. Users who need auto-sizing image behavior should provide a custom `image` render rule.
+- **`prop-types` removed** - Runtime prop validation is no longer performed. Use TypeScript for type checking.
+- **Class component replaced with function component** - `<Markdown>` is now a function component using hooks. Code relying on class instance methods or refs will break.
+- **`markdown-it` upgraded from ^8 to ^14** - Custom markdown-it plugins should verify compatibility.
+- **Package entry points changed** - `main` now points to `lib/commonjs/index.js`, `module` to `lib/module/index.js`, `types` to `lib/typescript/index.d.ts`.
+
+### New Features
+
+- Full TypeScript source with auto-generated type declarations
+- Exported types: `ASTNode`, `RenderFunction`, `RenderRules`, `MarkdownStyles`, `MarkdownProps`
+- ESM module output via react-native-builder-bob
+- Proper memoization using `useMemo` hooks for better rendering performance
+
+### Improvements
+
+- All source converted from JavaScript to TypeScript
+- Deprecated `componentWillMount` and `componentWillReceiveProps` replaced with hooks
+- Broken `PropTypes` import from `react` removed in AstRenderer
+- Unused `React` and `View` imports removed from parser
+- ESLint + Prettier configured
+- Jest test suite with 99 tests across 17 suites
+- Integration snapshot tests for comprehensive markdown rendering
+
+### Removed
+
+- `react-native-fit-image` dependency
+- `prop-types` dependency
+- `chokidar` and `fs-extra` dev dependencies
+- `bin/` build scripts (replaced by react-native-builder-bob)
+- `export.json` debug artifact
+- Hand-written `index.d.ts` (replaced by auto-generated types)
+- `.npmignore` (replaced by `files` field in package.json)