use environment variables defined on window

src/app/app.component.ts

@@ -1,10 +1,11 @@
 import { Component } from '@angular/core';
+import { environment } from '../environments/environment';
 
 @Component({
   selector: 'app-root',
   templateUrl: './app.component.html',
   styleUrls: ['./app.component.css']
 })
 export class AppComponent {
-  title = 'netlify-env';
+  title = environment.title;
 }

src/environments/environment.prod.ts

@@ -1,3 +1 @@
-export const environment = {
-  production: true
-};
+export const environment = (window as any).env;

src/environments/environment.ts

@@ -3,7 +3,8 @@
 // The list of file replacements can be found in `angular.json`.
 
 export const environment = {
-  production: false
+  production: false,
+  title: 'netlify-env'
 };
 
 /*