fix(typescript): fix typescript type DecodedJwt (#407)

* fix(typescript): fix typescript type DecodedJwt

* Update types.spec.ts

* fix: export missing typescript types

* Update index.d.ts

* Update index.d.ts

* Update types.spec.ts

* Update index.d.ts

* Update types.spec.ts

* Update index.d.ts

* Update types.spec.ts

Author: qoomon

src/index.d.ts

@@ -66,7 +66,7 @@ type VerifierCallback = (e: Error | TokenError | null, payload: any) => void
 
 type DecodedJwt = {
   header: { [key: string]: any },
-  payload: string,
+  payload: any,
   signature: string
 }
 

test/types.spec.ts

@@ -63,7 +63,10 @@ createVerifier({
 // Dynamic key in async style
 createVerifier({
   clockTimestamp: 10,
-  async key(_decodedJwt: DecodedJwt) {
+  async key(decodedJwt: DecodedJwt) {
+    if (decodedJwt.payload.iss) {
+      return 'ISS_KEY'
+    }
     return 'KEY'
   }
 })('456').then(console.log, console.log)