diff --git a/src/optionsStorageTypes.ts b/src/optionsStorageTypes.ts
new file mode 100644
index 00000000..b554da4d
--- /dev/null
+++ b/src/optionsStorageTypes.ts
@@ -0,0 +1,3 @@
+export const mergeAny: <T>(arg1: T, arg2: any) => T = Object.assign
+
+export type WatchValue = <T extends Record<string, any>>(proxy: T, callback: (p: T) => void) => void