[type] update type definition (#605)

types/index.d.ts

@@ -1,23 +1,37 @@
+import { Vue } from './vue';
+import { Weapp } from './weapp';
+
+type LooseObject = {
+  [key: string]: any;
+};
 type Mixins = any[];
-type Relations = object;
+type Relations<Instance> = {
+  [key: string]: {
+    type: string;
+    linked?: (this: Instance, target?: any) => void;
+    unlinked?: (this: Instance, target?: any) => void;
+  }
+};
 type ExternalClasses = string[];
 
-export interface Vue {
-  $emit(name: string, detail?: any): void;
-}
 
-export type VantComponentOptions<Props, Data, Methods> = {
+
+export type CombinedComponentInstance<Props, Data, Methods> = Vue &
+  LooseObject &
+  Weapp.Component & { data: Data & Props } & Methods;
+
+export type VantComponentOptions<Props, Data, Methods, Instance> = {
   data?: Data;
   props?: Props;
   field?: boolean;
   mixins?: Mixins;
-  relations?: Relations;
+  relations?: Relations<Instance>;
   classes?: ExternalClasses;
-  methods?: Methods & ThisType<Vue & Weapp.Component & { data: Data & Props } & Methods>;
+  methods?: Methods & ThisType<Instance>;
 
   // lifetimes
-  beforeCreate?: () => void;
+  beforeCreate?: (this: Instance) => void;
   created?: () => void;
   mounted?: () => void;
   destroyed?: () => void;
-}
+};

types/vue.d.ts

@@ -0,0 +1,3 @@
+export interface Vue {
+  $emit(name: string, detail?: any): void;
+}

types/weapp.d.ts

@@ -36,3 +36,7 @@ declare namespace Weapp {
     detail: any;
   }
 }
+
+export {
+  Weapp
+};