diff --git a/packages/core-api/src/apis/types.ts b/packages/core-api/src/apis/types.ts
index 52355f5396..bb09fbecae 100644
--- a/packages/core-api/src/apis/types.ts
+++ b/packages/core-api/src/apis/types.ts
@@ -22,7 +22,7 @@ export type ApiRefType<T> = T extends ApiRef<infer U> ? U : never;
 
 export type TypesToApiRefs<T> = { [key in keyof T]: ApiRef<T[key]> };
 
-export type ApiRefsToTypes<T extends { [key in any]: ApiRef<unknown> }> = {
+export type ApiRefsToTypes<T extends { [key in string]: ApiRef<unknown> }> = {
   [key in keyof T]: ApiRefType<T[key]>;
 };
 
@@ -30,10 +30,24 @@ export type ApiHolder = {
   get<T>(api: ApiRef<T>): T | undefined;
 };
 
-export type ApiFactory<Api, Impl, Deps> = {
+export type ApiFactory<
+  Api,
+  Impl,
+  Deps extends { [name in string]: unknown }
+> = {
   implements: ApiRef<Api>;
   deps: TypesToApiRefs<Deps>;
   factory(deps: Deps): Impl extends Api ? Impl : never;
 };
 
-export type AnyApiFactory = ApiFactory<unknown, unknown, unknown>;
+export type AnyApiFactory = ApiFactory<
+  unknown,
+  unknown,
+  { [key in string]: unknown }
+>;
+
+export type ApiFactoryHolder = {
+  get<T>(
+    api: ApiRef<T>,
+  ): ApiFactory<T, T, { [key in string]: unknown }> | undefined;
+};