feat(config): expose getMode() and deprecate Config (ionic-team#19104)

Author: manucorporat

angular/src/providers/config.ts

@@ -33,6 +33,7 @@ export class Config {
   }
 
   set(key: keyof IonicConfig, value?: any) {
+    console.warn(`[DEPRECATION][Config]: The Config.set() method is deprecated and will be removed in the next major release.`);
     const c = getConfig();
     if (c) {
       c.set(key, value);
@@ -44,7 +45,7 @@ export const ConfigToken = new InjectionToken<any>('USERCONFIG');
 
 const getConfig = (): CoreConfig | null => {
   if (typeof (window as any) !== 'undefined') {
-    const Ionic = (window as IonicWindow).Ionic;
+    const Ionic = (window as any as IonicWindow).Ionic;
     if (Ionic && Ionic.config) {
       return Ionic.config;
     }

core/src/utils/config.ts

@@ -199,3 +199,16 @@ export const setupConfig = (config: IonicConfig) => {
   };
   return win.Ionic.config;
 };
+
+export const getMode = (): Mode => {
+  const win = window as any;
+  const config = win && win.Ionic && win.Ionic.config;
+  if (config) {
+    if (config.mode) {
+      return config.mode;
+    } else {
+      return config.get('mode');
+    }
+  }
+  return 'md';
+};