Deep merge

package.json

@@ -19,6 +19,7 @@
     "@angular/platform-browser-dynamic": "^6.0.0",
     "@ngx-translate/core": ">=10.0.0",
     "core-js": "^2.5.4",
+    "deepmerge": "^2.1.1",
     "rxjs": "^6.1.0",
     "zone.js": "^0.8.26"
   },

projects/ngx-translate/multi-http-loader/src/lib/multi-http-loader.ts

@@ -2,6 +2,7 @@ import {HttpClient} from "@angular/common/http";
 import {TranslateLoader} from "@ngx-translate/core";
 import {Observable, forkJoin} from "rxjs";
 import {map} from "rxjs/operators";
+import merge from 'deepmerge';
 
 
 export interface ITranslationResource {
@@ -19,6 +20,6 @@ export class MultiTranslateHttpLoader implements TranslateLoader {
     const requests = this.resources.map(resource => {
       return this.http.get(resource.prefix + lang + resource.suffix);
     });
-    return forkJoin(requests).pipe(map(response => response.reduce((a, b) => Object.assign(a, b))));
+    return forkJoin(requests).pipe(map(response => merge.all(response)));
   }
 }

projects/ngx-translate/multi-http-loader/tests/multi-http-loader.spec.ts

@@ -151,11 +151,17 @@ describe('MultiTranslateHttpLoader - Multiple Translation Files', () => {
     // mock response after the xhr request, otherwise it will be undefined
     http.expectOne('/assets/i18n/core/en.json').flush({
       "TEST": "This is a test (core)",
-      "TEST2": "This is another test (core)"
+      "TEST2": "This is another test (core)",
+      "DEEP": {
+        "some": "thing"
+      }
     });
     http.expectOne('/assets/i18n/shared/en.json').flush({
       "TEST-SHARED": "This is a test (shared)",
-      "TEST2-SHARED": "This is another test (shared)"
+      "TEST2-SHARED": "This is another test (shared)",
+      "DEEP": {
+        "another": "something"
+      }
     });
 
     // this will request the translation from downloaded translations without making a request to the backend
@@ -165,5 +171,11 @@ describe('MultiTranslateHttpLoader - Multiple Translation Files', () => {
     translate.get('TEST2-SHARED').subscribe((res: string) => {
       expect(res).toEqual('This is another test (shared)');
     });
+    translate.get('DEEP').subscribe((res: any) => {
+      expect(res).toEqual({
+        "some": "thing",
+        "another": "something"
+      });
+    });
   });
 });