fix: expose .d.ts as cjs version (#253)

Author: xiaoxiangmoe

package.json

@@ -15,11 +15,10 @@
   "main": "./dist/magic-string.cjs.js",
   "module": "./dist/magic-string.es.mjs",
   "jsnext:main": "./dist/magic-string.es.mjs",
-  "types": "./index.d.ts",
+  "types": "./dist/magic-string.cjs.d.ts",
   "exports": {
     "./package.json": "./package.json",
     ".": {
-      "types": "./index.d.ts",
       "import": "./dist/magic-string.es.mjs",
       "require": "./dist/magic-string.cjs.js"
     }
@@ -30,7 +29,7 @@
     "README.md"
   ],
   "scripts": {
-    "build": "rollup -c",
+    "build": "rollup -c && cp ./src/index.d.ts ./dist/magic-string.es.d.mts && cp ./src/index.d.ts ./dist/magic-string.cjs.d.ts",
     "changelog": "conventional-changelog -p angular -i CHANGELOG.md -s",
     "format": "prettier --single-quote --print-width 100 --use-tabs --write src/*.js src/**/*.js",
     "lint": "eslint src test && publint",