types(@vant/lazyload): add declaration (#8295)

packages/vant-lazyload/package.json

@@ -4,7 +4,7 @@
   "description": "This is a fork of vue-lazyload",
   "main": "dist/cjs/index.js",
   "module": "dist/esm/index.js",
-  "types": "dist/index.d.ts",
+  "types": "types/index.d.ts",
   "publishConfig": {
     "access": "public",
     "registry": "https://registry.npmjs.org/"

packages/vant-lazyload/types/index.d.ts

@@ -0,0 +1,45 @@
+import { App } from 'vue';
+
+declare type ListenEvent =
+  | 'scroll'
+  | 'wheel'
+  | 'mousewheel'
+  | 'resize'
+  | 'animationend'
+  | 'transitionend'
+  | 'touchmove';
+
+// eslint-disable-next-line
+declare type Callback = (listener: any, options: LazyloadOptions) => void;
+
+declare type Filter = {
+  webp?: Callback;
+  progressive?: Callback;
+};
+
+declare type Adapter = {
+  error?: Callback;
+  loaded?: Callback;
+  loading?: Callback;
+};
+
+export declare type LazyloadOptions = {
+  error?: string;
+  filter?: Filter;
+  silent?: boolean;
+  adapter?: Adapter;
+  loading?: string;
+  attempt?: number;
+  preLoad?: number;
+  observer?: boolean;
+  lazyImage?: boolean;
+  throttleWait?: number;
+  listenEvents?: ListenEvent[];
+  dispatchEvent?: boolean;
+  lazyComponent?: boolean;
+  observerOptions?: IntersectionObserverInit;
+};
+
+export declare const Lazyload: {
+  install(app: App, options?: LazyloadOptions): void;
+};