0.1.0 (#1)

Co-authored-by: Julien Valverdé <julien.valverde@mailo.com>
Reviewed-on: https://git.jvalver.de/Thilawyn/traitify-ts/pulls/1

src/util/extend.ts

@@ -0,0 +1,25 @@
+import { Call, ComposeLeft, Fn, Match, Tuples } from "hotscript"
+import { CommonKeys } from "."
+
+
+type ExtendReducer<Super, Self> = (
+    Pick<Self, CommonKeys<Self, Super>> extends Pick<Super, CommonKeys<Self, Super>>
+        ? Omit<Super, CommonKeys<Self, Super>> & Self
+        : never
+)
+interface ExtendReducerFn extends Fn {
+    return: ExtendReducer<this["arg0"], this["arg1"]>
+}
+
+export type ExtendFn = Tuples.Reduce<ExtendReducerFn, {}>
+export type Extend<T extends {}[]> = Call<ExtendFn, T>
+
+
+export type ExtendableFn = ComposeLeft<[
+    ExtendFn,
+    Match<[
+        Match.With<never, false>,
+        Match.With<any, true>,
+    ]>
+]>
+export type Extendable<T extends {}[]> = Call<ExtendableFn, T>