Fix PluginOptions incorrect typings (#53)

* fix(types): indicate PluginOptions properties as optional

addtionally, tests were added to cover this change

* style(types): clean up typescript declaration file

remove unused imports & clean up dangling whitespaces

index.d.ts

@@ -1,5 +1,4 @@
 /// <reference types="node" />
-import * as fastify from 'fastify';
 import { IncomingMessage, ServerResponse, Server } from 'http';
 import { Plugin } from 'fastify';
 import * as WebSocket from 'ws';
@@ -40,7 +39,7 @@ declare module 'fastify' {
       >,
       handler?: WebsocketHandler<HttpRequest, HttpResponse>
     ): FastifyInstance<HttpServer, HttpRequest, HttpResponse>;
-    
+
     websocketServer: WebSocket.Server;
   }
 
@@ -84,8 +83,8 @@ declare namespace websocketPlugin {
   }
 
   export interface PluginOptions {
-    handle: (connection: SocketStream) => void;
-    options: WebSocket.ServerOptions;
+    handle?: (connection: SocketStream) => void;
+    options?: WebSocket.ServerOptions;
   }
 }
 

test/types/index.test-d.ts

@@ -5,9 +5,6 @@ import { WebsocketHandler, FastifyRequest, FastifyInstance } from 'fastify';
 import { expectType } from 'tsd';
 import { Server } from 'ws';
 
-const app: FastifyInstance = fastify();
-app.register(wsPlugin);
-
 const handler: WebsocketHandler = (
   connection: SocketStream,
   req: FastifyRequest,
@@ -18,4 +15,10 @@ const handler: WebsocketHandler = (
   expectType<{ [key: string]: any } | undefined>(params);
 };
 
+const app: FastifyInstance = fastify();
+app.register(wsPlugin);
+app.register(wsPlugin, {});
+app.register(wsPlugin, { handler });
+app.register(wsPlugin, { options: { perMessageDeflate: true } });
+
 app.get('/', { websocket: true }, handler);