Have gyp copy the .node file

bindings/node.js/Makefile

@@ -6,11 +6,9 @@ clean:
 	rm -f *.a
 	rm -f *.o
 
-build: kzg.cxx kzg.ts package.json Makefile
+build: kzg.cxx kzg.ts package.json binding.gyp Makefile
 	cd ../../src; make lib
 	yarn node-gyp rebuild
-	cp build/Release/kzg.node .
-	cp build/Release/kzg.node ./dist
 
 test: build
 	yarn jest

bindings/node.js/binding.gyp

@@ -22,6 +22,21 @@
       ],
       "dependencies": ["<!(node -p \"require('node-addon-api').gyp\")"],
       "defines": ["NAPI_DISABLE_CPP_EXCEPTIONS"]
+    },
+    {
+      "target_name": "action_after_build",
+      "type": "none",
+      "dependencies": ["kzg"],
+      "copies": [
+        {
+          "files": ["./build/Release/kzg.node"],
+          "destination": "."
+        },
+        {
+          "files": ["./build/Release/kzg.node"],
+          "destination": "./dist"
+        }
+      ]
     }
   ]
 }

bindings/node.js/package.json

@@ -5,6 +5,7 @@
   "author": "Dan Coffman",
   "license": "MIT",
   "main": "dist/kzg.js",
+  "types": "dist/dts/kzg.d.ts",
   "devDependencies": {
     "@babel/preset-typescript": "^7.18.6",
     "@rollup/plugin-typescript": "^9.0.2",