buid: switch to es2020

src/tsconfig.app.json

@@ -1,21 +1,16 @@
 {
-  "extends": "../tsconfig.base.json",
-  "compilerOptions": {
-    "outDir": "../out-tsc/app",
-    "module": "es2015",
-    "baseUrl": "",
-    "types": []
-  },
-  "include": [
-    "**/*.ts",
-
-  ],
-  "exclude": [
-    "**/*.spec.ts"
-  ],
-  "angularCompilerOptions": {
-    "fullTemplateTypeCheck": true,
-    "strictInjectionParameters": true,
-    "preserveWhitespaces": true
-  }
+    "extends": "../tsconfig.base.json",
+    "compilerOptions": {
+        "outDir": "../out-tsc/app",
+        "module": "es2020",
+        "baseUrl": "",
+        "types": []
+    },
+    "include": ["**/*.ts"],
+    "exclude": ["**/*.spec.ts"],
+    "angularCompilerOptions": {
+        "fullTemplateTypeCheck": true,
+        "strictInjectionParameters": true,
+        "preserveWhitespaces": true
+    }
 }