Created ToastService.d.ts

exports/toastservice.d.ts

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+export * from './components/toast/ToastService';

src/components/toast/ToastService.d.ts

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+import Vue, { PluginFunction } from 'vue';
+
+export const install: PluginFunction<{}>;
+
+interface ToastServiceMethods {
+  add(message: any): any;
+  removeGroup(group: any): void;
+  removeAllGroups(): void;
+}
+
+declare module 'vue/types/vue' {
+  interface Vue {
+    $toast: ToastServiceMethods;
+  }
+}