diff --git a/npm/ng-packs/packages/core/src/lib/models/config.ts b/npm/ng-packs/packages/core/src/lib/models/config.ts
index e3d6f6ab70..5f19907388 100644
--- a/npm/ng-packs/packages/core/src/lib/models/config.ts
+++ b/npm/ng-packs/packages/core/src/lib/models/config.ts
@@ -42,9 +42,14 @@ export namespace Config {
   }
 
   export type LocalizationParam = string | LocalizationWithDefault;
+  export type customMergeFn = (
+    localEnv: Partial<Config.Environment>,
+    remoteEnv: any,
+  ) => Config.Environment;
 
   export interface RemoteEnv {
     url: string;
+    mergeStrategy: 'deepmerge' | 'overwrite' | customMergeFn;
     method?: string;
     headers?: ABP.Dictionary<string>;
   }