add types definition

index.d.ts

@@ -0,0 +1,31 @@
+import SocketIOClient from "socket.io-client";
+import {
+    DefaultComputed,
+    DefaultData,
+    DefaultMethods,
+    DefaultProps,
+    PropsDefinition,
+} from "vue/types/options";
+import { Vue } from "vue/types/vue";
+
+interface socketHandler<T> {
+    (this: T, ...args: any[]): SocketIOClient.Socket
+}
+
+declare module 'vue/types/vue' {
+    interface Vue {
+        $socket: SocketIOClient.Socket
+    }
+}
+
+declare module 'vue/types/options' {
+    interface ComponentOptions<
+        V extends Vue,
+        Data=DefaultData<V>,
+        Methods=DefaultMethods<V>,
+        Computed=DefaultComputed,
+        PropsDef=PropsDefinition<DefaultProps>,
+        Props=DefaultProps> {
+        sockets: {[key: string]: socketHandler<V>}
+    }
+}

package.json

@@ -38,6 +38,7 @@
     "@babel/preset-env": "^7.1.0",
     "babel-loader": "^8.0.4",
     "cross-env": "^5.2.0",
+    "vue": "^2.6.10",
     "webpack": "^4.23.1",
     "webpack-cli": "^3.1.2"
   }