build(tsdown): migrate from tsc to tsdown for CJS/ESM dual output

Replaces tsc with tsdown to produce proper ESM output and resolve
Vite's CJS interop double-wrap issue. Adds exports field with import/
require conditions pointing to dist/index.mjs and dist/index.cjs.

Author: orrisroot

.cspell.json

@@ -14,13 +14,5 @@
     "subdir",
     "testattribute"
   ],
-  "ignorePaths": [
-    "coverage",
-    "dist",
-    "lib",
-    "node_modules",
-    "package.json",
-    "package-lock.json",
-    "src/dom/attributes/*.ts"
-  ]
+  "ignorePaths": ["coverage", "dist", "node_modules", "package.json", "package-lock.json", "src/dom/attributes/*.ts"]
 }

.npmignore

@@ -2,10 +2,12 @@
 .cspell.json
 biome.json
 tsconfig.json
-tsconfig.*.json
+tsdown.config.ts
 node_modules
 /coverage/
 /test/
 /demo/
+/lib/
+/src/
 vite.*.ts
 vitest.config.ts

package-lock.json

@@ -2,14 +2,25 @@
   "name": "@orrisroot/react-html-parser",
   "version": "3.0.0",
   "description": "Parse HTML into React components",
-  "main": "lib/index.js",
-  "types": "lib/index.d.ts",
+  "main": "dist/index.cjs",
+  "module": "dist/index.mjs",
+  "types": "dist/index.d.cts",
+  "exports": {
+    "import": {
+      "types": "./dist/index.d.mts",
+      "default": "./dist/index.mjs"
+    },
+    "require": {
+      "types": "./dist/index.d.cts",
+      "default": "./dist/index.cjs"
+    }
+  },
   "umd:main": "dist/react-html-parser.min.js",
   "unpkg": "dist/react-html-parser.min.js",
   "jsdelivr": "dist/react-html-parser.min.js",
   "source": "src/index.ts",
   "scripts": {
-    "clean": "rimraf coverage dist lib",
+    "clean": "rimraf coverage dist",
     "check": "npm run lint && npm run test",
     "test": "vitest run",
     "test:watch": "vitest",
@@ -18,7 +29,7 @@
     "lint:fix": "biome check --write .",
     "format": "biome format --write .",
     "build": "npm run build:lib && npm run build:umd:min && npm run build:umd",
-    "build:lib": "rimraf lib && tsc -p tsconfig.lib.json && tsc -p tsconfig.types.json",
+    "build:lib": "tsdown",
     "build:umd": "vite build --config vite.dev.ts",
     "build:umd:min": "vite build --config vite.prod.ts",
     "prerelease": "npm run clean && npm run check",
@@ -60,9 +71,10 @@
     "react": "^19.2.6",
     "react-dom": "^19.2.6",
     "rimraf": "^6.1.3",
-    "terser": "^5.47.1",
+    "terser": "^5.48.0",
+    "tsdown": "^0.22.0",
     "typescript": "^6.0.3",
-    "vite": "^8.0.13",
+    "vite": "^8.0.14",
     "vitest": "^4.1.7"
   },
   "dependencies": {

package.json

@@ -0,0 +1,14 @@
+import { defineConfig } from 'tsdown';
+
+export default defineConfig({
+  entry: ['src/index.ts'],
+  format: ['cjs', 'esm'],
+  dts: true,
+  sourcemap: true,
+  clean: false,
+  target: 'es2019',
+  outDir: 'dist',
+  deps: {
+    neverBundle: ['react', 'htmlparser2'],
+  },
+});

tsconfig.lib.json

@@ -3,6 +3,7 @@ import { defineConfig } from 'vite';
 
 export default defineConfig({
   build: {
+    emptyOutDir: false,
     lib: {
       entry: path.resolve(__dirname, 'src/index.ts'),
       name: 'ReactHtmlParser',