chore: 添加TypeScript类型定义

docs/widget/vite.config.js

@@ -1,13 +1,29 @@
 import { defineConfig } from 'vite';
 import { resolve } from 'path';
-import { readFileSync } from 'fs';
+import { readFileSync, copyFileSync } from 'fs';
 import cssInjectedByJsPlugin from 'vite-plugin-css-injected-by-js';
 
 const pkg = JSON.parse(readFileSync(new URL('./package.json', import.meta.url), 'utf-8'));
 const banner = `/*! CWDComments widget v${pkg.version} */`;
 
+function copyDtsPlugin() {
+  return {
+    name: 'copy-dts',
+    closeBundle() {
+      const src = resolve(__dirname, 'src/index.d.ts');
+      const dest = resolve(__dirname, 'dist/index.d.ts');
+      try {
+        copyFileSync(src, dest);
+        console.log(`[copy-dts] Copied ${src} to ${dest}`);
+      } catch (e) {
+        console.error(`[copy-dts] Failed to copy .d.ts file: ${e}`);
+      }
+    }
+  }
+}
+
 export default defineConfig({
-	plugins: [cssInjectedByJsPlugin()],
+	plugins: [cssInjectedByJsPlugin(), copyDtsPlugin()],
 	resolve: {
 		alias: {
 			'@': resolve(__dirname, 'src'),