Fix CJS build for TypeScript (#1360)

* Fix cjs build for ts

* add changeset

* refactor: copy index.d.ts with cp

---------

Co-authored-by: Marco Muser <marco.muser@enpal.de>

Author: marcomuser

.changeset/gold-islands-double.md

@@ -0,0 +1,5 @@
+---
+"openapi-fetch": patch
+---
+
+Fix CJS build for TypeScript

packages/openapi-fetch/package.json

@@ -13,9 +13,14 @@
   "types": "./dist/index.d.ts",
   "exports": {
     ".": {
-      "require": "./dist/index.cjs",
-      "import": "./dist/index.js",
-      "types": "./dist/index.d.ts"
+      "import": {
+        "types": "./dist/index.d.ts",
+        "default": "./dist/index.js"
+      },
+      "require": {
+        "types": "./dist/cjs/index.d.cts",
+        "default": "./dist/cjs/index.cjs"
+      }
     },
     "./*": "./*"
   },
@@ -46,7 +51,7 @@
     "build:clean": "del dist",
     "build:ts": "tsc -p tsconfig.build.json",
     "build:ts-min": "esbuild --bundle src/index.ts --format=esm --minify --outfile=dist/index.min.js && cp dist/index.d.ts dist/index.min.d.ts",
-    "build:cjs": "esbuild --bundle src/index.ts --format=cjs --outfile=dist/index.cjs",
+    "build:cjs": "esbuild --bundle src/index.ts --format=cjs --outfile=dist/cjs/index.cjs && cp dist/index.d.ts dist/cjs/index.d.cts",
     "lint": "pnpm run lint:js",
     "lint:js": "eslint \"{src,test}/**/*.{js,ts}\"",
     "lint:prettier": "prettier --check \"{src,test}/**/*\"",