build: move to tsdown

Author: hyoban

package.json

@@ -14,41 +14,22 @@
   },
   "exports": {
     ".": {
-      "types": "./dist/index.d.ts",
-      "import": {
-        "types": "./dist/index.d.ts",
-        "default": "./dist/index.js"
-      },
-      "require": {
-        "types": "./dist/index.d.cts",
-        "default": "./dist/index.cjs"
-      },
-      "default": "./dist/index.js"
+      "types": "./dist/index.d.mts",
+      "import": "./dist/index.mjs"
     },
     "./iconify": {
-      "types": "./dist/iconify.d.ts",
-      "import": {
-        "types": "./dist/iconify.d.ts",
-        "default": "./dist/iconify.js"
-      },
-      "require": {
-        "types": "./dist/iconify.d.cts",
-        "default": "./dist/iconify.cjs"
-      },
-      "default": "./dist/iconify.js"
-    }
+      "types": "./dist/iconify.d.mts",
+      "import": "./dist/iconify.mjs"
+    },
+    "./package.json": "./package.json"
   },
-  "main": "./dist/index.cjs",
-  "module": "./dist/index.js",
-  "types": "./dist/index.d.ts",
   "files": [
     "dist"
   ],
   "scripts": {
     "prepare": "simple-git-hooks",
     "gen-types": "node ./gen-types.mjs && eslint --fix ./types.ts",
-    "build-fast": "pnpm gen-types && tsup src/index.ts src/iconify.ts --format cjs,esm",
-    "build": "pnpm run build-fast --dts-resolve",
+    "build": "pnpm gen-types && tsdown",
     "prepublishOnly": "pnpm run build",
     "test": "vitest run",
     "lint": "eslint --max-warnings 0",
@@ -68,6 +49,7 @@
     "@iconify/utils": "^3.1.0"
   },
   "devDependencies": {
+    "@arethetypeswrong/core": "^0.18.2",
     "@ianvs/prettier-plugin-sort-imports": "^4.7.0",
     "@iconify-json/heroicons": "^1.2.3",
     "@iconify/json": "^2.2.433",
@@ -80,9 +62,10 @@
     "postcss": "^8.5.6",
     "prettier": "^3.8.1",
     "prettier-plugin-tailwindcss": "^0.7.2",
+    "publint": "^0.3.17",
     "simple-git-hooks": "^2.13.1",
     "tailwindcss": "^3.4.19",
-    "tsup": "^8.5.1",
+    "tsdown": "^0.20.1",
     "typescript": "^5.9.3",
     "vitest": "^4.0.18"
   },