feat(core): first class a11y support (#8909)

packages/core/application/index.d.ts

@@ -54,6 +54,11 @@ export const orientationChangedEvent: string;
  */
 export const systemAppearanceChangedEvent: string;
 
+/**
+ * String value used when hooking to fontScaleChanged event.
+ */
+export const fontScaleChangedEvent: string;
+
 /**
  * Boolean to enable/disable systemAppearanceChanged
  */
@@ -62,7 +67,7 @@ export let autoSystemAppearanceChanged: boolean;
 /**
  * enable/disable systemAppearanceChanged
  */
-export function setAutoSystemAppearanceChanged(value: boolean);
+export function setAutoSystemAppearanceChanged(value: boolean): void;
 
 /**
  * Updates root view classes including those of modals
@@ -184,6 +189,11 @@ export function setCssFileName(cssFile: string): void;
  */
 export function getCssFileName(): string;
 
+/**
+ * Ensure css-class is set on rootView
+ */
+export function applyCssClass(rootView: View, cssClasses: string[], newCssClass: string): void;
+
 /**
  * Loads immediately the app.css.
  * By default the app.css file is loaded shortly after "loaded".