Extendable

src/util/extend.ts

@@ -1,4 +1,4 @@
-import { Call, Fn, Tuples } from "hotscript"
+import { Call, ComposeLeft, Fn, Match, Tuples } from "hotscript"
 
 
 type CommonKeys<A, B> = Extract<keyof A, keyof B>
@@ -14,3 +14,13 @@ interface ExtendReducerFn extends Fn {
 
 export type ExtendFn = Tuples.Reduce<ExtendReducerFn, {}>
 export type Extend<T extends readonly object[]> = Call<ExtendFn, T>
+
+
+export type ExtendableFn = ComposeLeft<[
+    ExtendFn,
+    Match<[
+        Match.With<never, false>,
+        Match.With<any, true>,
+    ]>
+]>
+export type Extendable<T extends readonly object[]> = Call<ExtendableFn, T>