fix: export bug in TypeScript definition (#188)

Author: snowyu

types/index.d.ts

@@ -5,46 +5,42 @@
 
 import Vue, { VNode } from 'vue';
 
-declare namespace InfiniteLoading {
-  type SpinnerType = 'default' | 'bubbles' | 'circles' | 'spiral' | 'waveDots';
-
-  type DirectionType = 'top' | 'bottom';
-
-  interface Slots {
-    spinner: VNode[];
-    'no-result': VNode[];
-    'no-more': VNode[];
-    [key: string]: VNode[];
-  }
-
-  interface StateChanger {
-    loaded(): void;
-    complete(): void;
-    reset(): void;
-  }
+export type SpinnerType = 'default' | 'bubbles' | 'circles' | 'spiral' | 'waveDots';
+export type DirectionType = 'top' | 'bottom';
+
+export interface Slots {
+  spinner: VNode[];
+  'no-result': VNode[];
+  'no-more': VNode[];
+  [key: string]: VNode[];
 }
 
-declare class InfiniteLoading extends Vue {
+export interface StateChanger {
+  loaded(): void;
+  complete(): void;
+  reset(): void;
+}
+
+export default class InfiniteLoading extends Vue {
   // The trigger distance
   distance: number;
 
   // The load spinner type
-  spinner: InfiniteLoading.SpinnerType;
+  spinner: SpinnerType;
 
   // The scroll direction
-  direction: InfiniteLoading.DirectionType;
+  direction: DirectionType;
 
   // Whether find the element which has `infinite-wrapper` attribute as the scroll wrapper
   forceUseInfiniteWrapper: boolean;
 
   // Infinite event handler
-  onInfinite: ($state: InfiniteLoading.StateChanger) => void;
+  onInfinite: ($state: StateChanger) => void;
 
   // The method collection used to change infinite state
-  stateChanger: InfiniteLoading.StateChanger;
+  stateChanger: StateChanger;
 
   // Slots
-  $slots: InfiniteLoading.Slots;
+  $slots: Slots;
 }
 
-export default InfiniteLoading;