change package manager to pnpm, change type definition

package.json

@@ -10,7 +10,7 @@
 		"url": "https://github.com/evilbocchi/rbxts-transformer-instances.git"
 	},
 	"scripts": {
-		"prepare": "npm run generate-declarations && npm run build",
+		"prepack": "npm run generate-declarations && npm run build",
 		"build": "tsc",
 		"watch": "tsc -w",
 		"test": "jest",

scripts/generate-declarations.js

@@ -112,6 +112,7 @@ function generateDeclarations(classNames) {
  */
 type CreatableInstancesWithConstructors = {
     [K in keyof CreatableInstances]: {
+        new (parent?: Instance): CreatableInstances[K];
         new (...args: any[]): CreatableInstances[K];
     }
 }