Still WIP

js/entity/ComputedTypeEntity.js

@@ -0,0 +1,22 @@
+import IEntity from "./IEntity.js"
+
+export default class ComputedTypeEntity extends IEntity {
+
+    /** @type {(entity: IEntity) => typeof IEntity} */
+    static f
+
+    /**
+     * @template {typeof ComputedTypeEntity.f} T
+     * @param {T} producer
+     */
+    static from(producer) {
+        const result = /** @type {(typeof ComputedTypeEntity) & { f: T }} */(this.asUniqueClass())
+        result.f = producer
+        return result
+    }
+
+    /** @param {IEntity} entity */
+    compute(entity) {
+        return /** @type {typeof ComputedTypeEntity} */(this.Self()).f(entity)
+    }
+}