diff --git a/src/ui/react/hooks/index.ts b/src/ui/react/hooks/index.ts
index 2d14f69..764e76b 100644
--- a/src/ui/react/hooks/index.ts
+++ b/src/ui/react/hooks/index.ts
@@ -1,31 +1,19 @@
 import type { DebugConfig, FullDB } from "../../../core";
 import type { ReactType } from "../types";
+import type {
+  Changer,
+  MassUpdater,
+  MassUpdaterInternal,
+  Updater,
+  UpdaterInternal,
+} from "./types";
+
+export type { MassUpdater, Updater } from "./types";
 
 function flat<T>(list: T[][]): T[] {
   return list.reduce((a, b) => a.concat(b));
 }
 
-type MassUpdaterInternal<Domain, K extends keyof Domain> = (
-  options: {},
-  kind: K,
-  id: string,
-  delta: (prev: Domain[K]) => Domain[K]
-) => void;
-export type MassUpdater<Domain, K extends keyof Domain> = MassUpdaterInternal<
-  Domain,
-  K
-> & {
-  (kind: K, id: string, delta: (prev: Domain[K]) => Domain[K]): void;
-};
-
-type UpdaterInternal<T> = (options: {}, delta: (prev: T) => T) => void;
-export type Updater<T> = UpdaterInternal<T> & {
-  (delta: (prev: T) => T): void;
-} & (T extends {}
-    ? { <K extends keyof T & string>(field: K, value: T[K]): void }
-    : {});
-type Changer<T> = [T | "loading", Updater<T>];
-
 function makeMassUpdater<Domain, K extends keyof Domain>(
   db: FullDB<Domain>
 ): MassUpdater<Domain, K> {
diff --git a/src/ui/react/hooks/types.ts b/src/ui/react/hooks/types.ts
new file mode 100644
index 0000000..df2b169
--- /dev/null
+++ b/src/ui/react/hooks/types.ts
@@ -0,0 +1,20 @@
+export type MassUpdaterInternal<Domain, K extends keyof Domain> = (
+  options: {},
+  kind: K,
+  id: string,
+  delta: (prev: Domain[K]) => Domain[K]
+) => void;
+export type MassUpdater<Domain, K extends keyof Domain> = MassUpdaterInternal<
+  Domain,
+  K
+> & {
+  (kind: K, id: string, delta: (prev: Domain[K]) => Domain[K]): void;
+};
+
+export type UpdaterInternal<T> = (options: {}, delta: (prev: T) => T) => void;
+export type Updater<T> = UpdaterInternal<T> & {
+  (delta: (prev: T) => T): void;
+} & (T extends {}
+    ? { <K extends keyof T & string>(field: K, value: T[K]): void }
+    : {});
+export type Changer<T> = [T | "loading", Updater<T>];