[ADF-5410] code fixes and updates prior to Angular 12 upgrade (#7177)

* package fixes

* upgrade stylelint config

* upgrade configuration and stats

* code fixes based on Angular upgrade

* rework scss-bundle usage

* use node 14 with travis (lts)

* fix production builds

* fix node sass version

lib/extensions/src/lib/services/app-extension.service.ts

@@ -55,7 +55,7 @@ export class AppExtensionService {
      * The result is filtered by the **disabled** state.
      * @param key Preset key.
      */
-    getDocumentListPreset(key: string) {
+    getDocumentListPreset(key: string): DocumentListPresetRef[] {
         return this.extensionService
           .getElements<DocumentListPresetRef>(
             `features.documentList.${key}`

lib/extensions/tsconfig.lib.json

@@ -2,6 +2,7 @@
   "extends": "../tsconfig.json",
   "compilerOptions": {
     "outDir": "../dist/extensions/",
+    "declarationMap": true,
     "baseUrl": "src"
   },
   "angularCompilerOptions": {

lib/extensions/tsconfig.lib.prod.json

@@ -1,6 +1,9 @@
 {
   "extends": "./tsconfig.lib.json",
+  "compilerOptions": {
+    "declarationMap": false
+  },
   "angularCompilerOptions": {
     "enableIvy": false
   }
-}
+}