fix

README.md

@@ -1,12 +1,14 @@
 # ufcs
 
 ```ts
+import { ufcs } from "./mod.ts"
+
 const Duck = ufcs(class Duck {
-    quack() {
-        console.log("Quack!")
+    quack(num: number) {
+        console.log("Quack!", num)
     }
 })
-Duck.quack(new Duck)
-
-const d = new Duck
+const duck = new Duck
+Duck.quack(123)(duck); // Quack! 123
+duck.quack(456) // Quack! 456
 ```

mod.ts

@@ -1,11 +1,11 @@
-type Ufcs<C extends {"prototype": any}> = {
-    [K in keyof C["prototype"]]:
-        C["prototype"][K] extends (...args: any[]) => any
-            ? (...args: Parameters<C["prototype"][K]>) => (_this: C) => ReturnType<C["prototype"][K]>
+export type Ufcs<C> = {
+    [K in keyof C]:
+        C[K] extends (...args: any[]) => any
+            ? (...args: Parameters<C[K]>) => (_this: C) => ReturnType<C[K]>
             : never
-} & C
+} & { new (): C }
 
-export const ufcs = <C extends {"prototype": unknown}>(_class: C) => {
+export const ufcs = <C>(_class: { new (): C }) => {
     Object.getOwnPropertyNames(_class.prototype)
         .forEach(prop => {
             if (prop != "constructor") {
@@ -15,13 +15,4 @@ export const ufcs = <C extends {"prototype": unknown}>(_class: C) => {
             }
         })
     return _class as unknown as Ufcs<C>
-}
-
-const Duck = ufcs(class Duck {
-    quack(num: number) {
-        console.log("Quack!", num)
-    }
-})
-const duck = new Duck
-Duck.quack(123)(duck); // Quack! 123
-duck.quack(123) // Quack! 123
+}

test.ts

@@ -1,8 +1,10 @@
 import { ufcs } from "./mod.ts"
 
 const Duck = ufcs(class Duck {
-    quack() {
-        console.log("Quack!")
+    quack(num: number) {
+        console.log("Quack!", num)
     }
 })
-Duck.quack(new Duck) // Quack!
+const duck = new Duck
+Duck.quack(123)(duck); // Quack! 123
+duck.quack(456) // Quack! 456