[Fix] type definition file (#196)

Author: code-raisan

types/index.d.ts

@@ -19,7 +19,7 @@ interface FastifyOauth2 extends FastifyPluginCallback<fastifyOauth2.FastifyOAuth
 declare namespace fastifyOauth2 {
   export interface FastifyOAuth2Options {
     name: string;
-    scope: string[];
+    scope?: string[];
     credentials: Credentials;
     callbackUri: string;
     callbackUriParams?: Object;

types/index.test-d.ts

@@ -15,6 +15,13 @@ const credentials: Credentials = {
   },
   auth: auth,
 };
+
+const OAuth2NoneOptional: FastifyOAuth2Options = {
+  name: 'testOAuthName',
+  credentials: credentials,
+  callbackUri: 'http://localhost/testOauth/callback'
+};
+
 const OAuth2Options: FastifyOAuth2Options = {
   name: 'testOAuthName',
   scope: scope,
@@ -28,6 +35,7 @@ const OAuth2Options: FastifyOAuth2Options = {
 
 const server = fastify();
 
+server.register(fastifyOauth2, OAuth2NoneOptional)
 server.register(fastifyOauth2, OAuth2Options);
 
 server.register(fastifyOauth2, {