1 files changed, 28 insertions, 1 deletions
diff --git a/packages/exchange-backoffice-ui/src/handlers/useField.ts b/packages/exchange-backoffice-ui/src/handlers/useField.ts
index 3be397314..94635646f 100644
--- a/packages/exchange-backoffice-ui/src/handlers/useField.ts
+++ b/packages/exchange-backoffice-ui/src/handlers/useField.ts
@@ -12,7 +12,9 @@ export interface InputFieldHandler<Type> {
   isDirty: boolean;
 }
 
-export function useField<T>(name: keyof T): InputFieldHandler<T[keyof T]> {
+export function useField<T extends object, K extends keyof T>(
+  name: K,
+): InputFieldHandler<T[K]> {
   const {
     initialValue,
     value: formValue,
@@ -78,3 +80,28 @@ function setValueDeeper(object: any, names: string[], value: any): any {
   }
   return { ...object, [head]: setValueDeeper(object[head] ?? {}, rest, value) };
 }
+
+type TTT<T extends object, K extends keyof T, R> = K extends keyof T
+  ? R extends T[K]
+    ? number
+    : never
+  : never;
+
+function impl<T extends object, K extends keyof T, R extends T[K]>(
+  obj: T,
+  name: K,
+): T[K] {
+  return obj[name];
+}
+
+interface Pepe {
+  name: string;
+  when: Date;
+  size: number;
+}
+const p: Pepe = {
+  name: "n",
+  when: new Date(),
+  size: 1,
+};
+const a = impl(p, "size");