MutableClass work

src/effect/schema/class/MutableClass.ts

@@ -1,9 +1,26 @@
 import { Schema as S } from "@effect/schema"
-import type { Annotations, Struct } from "@effect/schema/Schema"
+import type { Annotations, Class, Struct } from "@effect/schema/Schema"
+import type { StaticType } from "../../../StaticType"
 import type { TMutableClass } from "./TMutableClass"
 import type { HasFields } from "./util"
 
 
+export interface IMutableClass<
+    Self,
+    Fields extends Struct.Fields,
+    I, R, C,
+    Inherited,
+    Proto,
+>
+extends Omit<
+    StaticType<Class<Self, Fields, I, R, C, Inherited, Proto>>,
+    "extend"
+>
+{
+
+}
+
+
 export function MutableClass<Self>(identifier: string) {
     return <Fields extends Struct.Fields>(
         fieldsOr:      Fields | HasFields<Fields>,