Merge pull request #31036 from j2L4e/feathers-default-export

@feathersjs/feathers: make default export type generic

types/feathersjs__feathers/feathersjs__feathers-tests.ts

@@ -9,7 +9,7 @@ interface Services {
     users: User;
 }
 
-const app = feathers() as Application<Services>;
+const app = feathers<Services>();
 
 app.service('users').get(0).then(u => {
     const user: User = u;

types/feathersjs__feathers/index.d.ts

@@ -12,7 +12,8 @@
 import { EventEmitter } from 'events';
 import * as self from '@feathersjs/feathers';
 
-declare const feathers: (() => Application<object>) & typeof self;
+// tslint:disable-next-line no-unnecessary-generics
+declare const feathers: (<T = any>() => Application<T>) & typeof self;
 export default feathers;
 
 export const version: string;