fix(index): check options.decorateReply is a boolean (#178)

* fix(types/index): correct `decorateReply` type

Signed-off-by: Frazer Smith <frazer.dev@icloud.com>

* test(types/index): add tsd tests

* fix(index): check `options.decorateReply` is a boolean

---------

Signed-off-by: Frazer Smith <frazer.dev@icloud.com>

Author: Fdawgs

index.js

@@ -38,7 +38,7 @@ function fastifyAccepts (fastify, options, done) {
     })
   })
 
-  if (options.decorateReply) {
+  if (options.decorateReply === true) {
     fastify.decorateReply('requestAccepts', replyAcceptMethod)
 
     methodNames.forEach(methodName => {

types/index.d.ts

@@ -109,7 +109,7 @@ type FastifyAccepts = FastifyPluginCallback<fastifyAccepts.FastifyAcceptsOptions
 
 declare namespace fastifyAccepts {
   export interface FastifyAcceptsOptions {
-    decorateReply: boolean
+    decorateReply?: boolean | undefined
   }
 
   export const fastifyAccepts: FastifyAccepts

types/index.test-d.ts

@@ -4,6 +4,8 @@ import accepts from '..'
 const app = fastify()
 
 app.register(accepts)
+app.register(accepts, { decorateReply: true })
+app.register(accepts, { decorateReply: false })
 
 app.get('/', (request, reply) => {
   const accept = request.accepts()