Export originCallback and originFunction (#64)

Fixes #62 #63

Author: ghostd

index.d.ts

@@ -3,7 +3,7 @@
 import { FastifyPlugin } from 'fastify'
 
 type OriginCallback = (err: Error | null, allow: boolean) => void;
-type OriginFunction = (origin: string, callback: OriginCallback) => void;
+export type OriginFunction = (origin: string, callback: OriginCallback) => void;
 type OriginType = string | boolean | RegExp;
 type ValueOrArray<T> = T | ArrayOfValueOrArray<T>;
 interface ArrayOfValueOrArray<T> extends Array<ValueOrArray<T>> { }

test/index.test-d.ts

@@ -1,5 +1,5 @@
 import fastify from 'fastify'
-import fastifyCors from '..'
+import fastifyCors, {OriginFunction} from '..'
 
 const app = fastify()
 
@@ -77,14 +77,16 @@ app.register(fastifyCors, {
   preflight: false
 })
 
+const corsDelegate: OriginFunction = (origin, cb) => {
+  if (typeof origin === 'undefined' || /localhost/.test(origin)) {
+    cb(null, true)
+    return
+  }
+  cb(new Error(), false)
+};
+
 app.register(fastifyCors, {
-  origin: (origin: string, cb: (err: Error | null, allow: boolean) => void) => {
-    if (/localhost/.test(origin) || typeof origin === 'undefined') {
-      cb(null, true)
-      return
-    }
-    cb(new Error(), false)
-  },
+  origin: corsDelegate,
   allowedHeaders: ['authorization', 'content-type'],
   methods: ['GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'OPTIONS'],
   credentials: true,
@@ -172,8 +174,8 @@ appHttp2.register(fastifyCors, {
 })
 
 appHttp2.register(fastifyCors, {
-  origin: (origin: string, cb: (err: Error | null, allow: boolean) => void) => {
-    if (/localhost/.test(origin) || typeof origin === 'undefined') {
+  origin: (origin: string | undefined, cb: (err: Error | null, allow: boolean) => void) => {
+    if (typeof origin === 'undefined' || /localhost/.test(origin)) {
       cb(null, true)
       return
     }