load locale files by require

src/_locales/en/messages.json

@@ -1,5 +1,8 @@
 {
   "hello": {
     "message": "hello"
+  },
+  "world": {
+    "message": "world"
   }
 }

src/app/services/services.module.ts

@@ -2,7 +2,7 @@ import { webFrame } from 'electron';
 
 import {
     APP_INITIALIZER,
-    NgModule
+    NgModule,
 } from '@angular/core';
 
 import { DesktopMessagingService } from '../../services/desktopMessaging.service';
@@ -112,8 +112,8 @@ function initFactory(i18n: I18nService): Function {
             provide: APP_INITIALIZER,
             useFactory: initFactory,
             deps: [I18nService],
-            multi: true
+            multi: true,
-        }
+        },
     ],
 })
 export class ServicesModule {

src/services/i18n.service.ts

@@ -1,3 +1,5 @@
+import * as path from 'path';
+
 // First locale is the default (English)
 const SupportedLocales = [
     'en', 'es',
@@ -49,14 +51,16 @@ export class I18nService {
         return '';
     }
 
-    private async loadMessages(locale: string, messagesObj: any): Promise<any> {
+    private loadMessages(locale: string, messagesObj: any): Promise<any> {
         const formattedLocale = locale.replace('-', '_');
-        const file = await fetch(this.localesDirectory + '/' + formattedLocale + '/messages.json');
+        const filePath = path.join(__dirname, this.localesDirectory + '/' + formattedLocale + '/messages.json');
-        const locales = await file.json();
+        const locales = (window as any).require(filePath);
         for (const prop in locales) {
             if (locales.hasOwnProperty(prop)) {
                 messagesObj[prop] = locales[prop].message;
             }
         }
+
+        return Promise.resolve();
     }
 }