Project setup (#1)

Sets up project build and CI Co-authored-by: Julien Valverdé <julien.valverde@mailo.com> Reviewed-on: https://git.jvalver.de/Thilawyn/thilatrait/pulls/1
2023-12-09 02:22:38 +01:00
parent d7c80f0ba7
commit c6de7004d2
10 changed files with 360 additions and 0 deletions
--- a/src/trait.ts
+++ b/src/trait.ts
@@ -0,0 +1,87 @@
+import { AbstractClass, Class, UnionToIntersection } from "type-fest"
+import { copyClassProperties, flattenClass } from "./class"
+import { StaticMembers } from "./utils"
+
+
+export type Trait<T> =
+    AbstractClass<T, []>
+
+
+// export function applyTrait<
+//     C      extends Class<any, any> | AbstractClass<any, any>,
+//     TraitC extends Trait<any>,
+// >(
+//     class_:  C,
+//     trait:   TraitC,
+// ) {
+//     copyClassProperties(trait, class_)
+
+//     return class_ as (
+//         (C extends Class<any, any>
+//             ? Class<
+//                 InstanceType<C> & InstanceType<TraitC>,
+//                 ConstructorParameters<C>
+//             >
+//             : AbstractClass<
+//                 InstanceType<C> & InstanceType<TraitC>,
+//                 ConstructorParameters<C>
+//             >
+//         ) &
+//         StaticMembers<C> &
+//         StaticMembers<TraitC>
+//     )
+// }
+
+
+export const extendAndApplyTraits = <
+    C      extends Class<any, any> | AbstractClass<any, any>,
+    Traits extends readonly Trait<any>[],
+>(
+    classToExtend:  C,
+    traits:         Traits,
+) =>
+    traits.reduce((class_, trait) => {
+        copyClassProperties(flattenClass(trait), class_)
+        return class_
+    }, class extends classToExtend {}) as (
+        AbstractClass<
+            InstanceType<C> &
+            UnionToIntersection<
+                InstanceType<Traits[number]>
+            >,
+
+            ConstructorParameters<C>
+        > &
+
+        StaticMembers<
+            C &
+            UnionToIntersection<
+                Traits[number]
+            >
+        >
+    )
+
+
+export const mixTraits = <
+    Traits extends readonly Trait<any>[]
+>(
+    ...traits: Traits
+) =>
+    traits.reduce((class_, trait) => {
+        copyClassProperties(flattenClass(trait), class_)
+        return class_
+    }, class {}) as (
+        Trait<
+            UnionToIntersection<
+                InstanceType<
+                    Traits[number]
+                >
+            >
+        > &
+
+        StaticMembers<
+            UnionToIntersection<
+                Traits[number]
+            >
+        >
+    )