fix: add missing types for plugin options and error slot

Author: PeachScript

types/index.d.ts

@@ -3,7 +3,7 @@
 // Definitions by: Phil Scott <https://github.com/enkafan>
 //                 PeachScript <https://github.com/PeachScript>
 
-import Vue, { VNode } from 'vue';
+import Vue, { VNode, Component } from 'vue';
 
 export type SpinnerType = 'default' | 'bubbles' | 'circles' | 'spiral' | 'waveDots';
 export type DirectionType = 'top' | 'bottom';
@@ -12,13 +12,35 @@ export interface Slots {
   spinner: VNode[];
   'no-result': VNode[];
   'no-more': VNode[];
+  'error': VNode[];
   [key: string]: VNode[];
 }
 
 export interface StateChanger {
   loaded(): void;
   complete(): void;
   reset(): void;
+  error(): void;
+}
+
+export interface InfiniteOptions {
+  props?: {
+    spinner?: SpinnerType;
+    distance?: number;
+    forceUseInfiniteWrapper?: boolean | string;
+  };
+
+  system?: {
+    throttleLimit?: number;
+  };
+
+  slots?: {
+    noResults?: string | Component;
+    noMore?: string | Component;
+    error?: string | Component;
+    errorBtnText?: string;
+    spinner?: string | Component;
+  };
 }
 
 export default class InfiniteLoading extends Vue {
@@ -32,7 +54,7 @@ export default class InfiniteLoading extends Vue {
   direction: DirectionType;
 
   // Whether find the element which has `infinite-wrapper` attribute as the scroll wrapper
-  forceUseInfiniteWrapper: boolean;
+  forceUseInfiniteWrapper: boolean | string;
 
   // Infinite event handler
   onInfinite: ($state: StateChanger) => void;