fix FastifyJWTOptions.secret property type (#102)

Author: AleF83

jwt.d.ts

@@ -59,9 +59,11 @@ declare module 'fastify' {
   }
 }
 
+type Secret = jwt.Secret | ((request: fastify.FastifyRequest, reply: fastify.FastifyReply, cb: (e: Error | null, secret: string | undefined) => void) => void);
+
 declare namespace fastifyJWT {
   export interface FastifyJWTOptions {
-    secret: jwt.Secret | { public: jwt.Secret; private: jwt.Secret };
+    secret: Secret | { public: Secret; private: Secret };
     decode?: jwt.DecodeOptions;
     sign?: jwt.SignOptions;
     verify?: jwt.VerifyOptions & { extractToken?: (request: fastify.FastifyRequest) => string | void; };

jwt.test-d.ts

@@ -5,7 +5,22 @@ import { expectAssignable } from 'tsd'
 const app = fastify();
 
 const jwtOptions: FastifyJWTOptions = {
-    secret: process.env.usePublicPrivateKeys ? "supersecret" : { public: 'publicKey', private: 'privateKey' },
+    secret: {
+        secret: 'supersecret',
+        publicPrivateKey: {
+            public: 'publicKey',
+            private: 'privateKey'
+        },
+        secretFn: (_req, _rep, cb) => { cb(null, 'supersecret') },
+        publicPrivateKeyFn: {
+            public: (_req, _rep, cb) => { cb(null, 'publicKey') },
+            private: 'privateKey'
+        },
+        publicPrivateKeyFn2: {
+            public: 'publicKey',
+            private: (_req, _rep, cb) => { cb(null, 'privateKey') },
+        }
+    }[process.env.secretOption!],
     sign: {
         expiresIn: '1h'
     },