fix: use tsup for ESM build to resolve ERR_UNSUPPORTED_DIR_IMPORT

Author: hsluoyz

package.json

@@ -4,11 +4,11 @@
   "description": "An authorization library that supports access control models like ACL, RBAC, ABAC in Node.JS",
   "main": "lib/cjs/index.js",
   "typings": "lib/cjs/index.d.ts",
-  "module": "lib/esm/index.js",
+  "module": "lib/esm/index.mjs",
   "exports": {
     ".": {
       "types": "./lib/cjs/index.d.ts",
-      "import": "./lib/esm/index.js",
+      "import": "./lib/esm/index.mjs",
       "require": "./lib/cjs/index.js"
     },
     "./package.json": "./package.json"
@@ -18,7 +18,7 @@
     "postpack": "run-s clean",
     "build": "run-s clean && run-p build:*",
     "build:cjs": "tsc -p tsconfig.cjs.json",
-    "build:esm": "tsc -p tsconfig.esm.json",
+    "build:esm": "tsup src/index.ts --format esm --outDir lib/esm --no-splitting --no-dts",
     "test": "jest",
     "lint": "eslint . --ext .js,.ts",
     "fmt": "eslint . --ext .js,.ts --fix",
@@ -51,6 +51,7 @@
     "semantic-release": "^17.4.4",
     "ts-jest": "^26.5.3",
     "tslint": "^5.11.0",
+    "tsup": "^8.5.1",
     "typescript": "^4.9.5"
   },
   "dependencies": {

src/util/ip.ts

@@ -26,7 +26,7 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-import { Buffer } from 'buffer/';
+import { Buffer } from 'buffer';
 
 const ipv4Regex = /^(25[0-5]|2[0-4]\d|1\d\d|\d?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|\d?\d)){3}$/;
 const ipv6Regex = /^(::)?(((\d{1,3}\.){3}(\d{1,3}){1})?([0-9a-f]){0,4}:{0,2}){1,8}(::)?$/i;