encodeToken required argument

packages/abi/src/encoder/encoder.spec.ts

@@ -10,7 +10,7 @@ import { padAddress, padFixedBytes, padU32 } from '../util/pad';
 describe('encoder/Encoder', () => {
   describe('encodeToken', () => {
     it('requires token as Token', () => {
-      expect(() => Encoder.encodeToken(undefined)).toThrow(/Token/);
+      expect(() => Encoder.encodeToken(undefined as any)).toThrow(/Token/);
     });
 
     it('encodes address tokens in Mediate(raw)', () => {

packages/abi/src/encoder/encoder.ts

@@ -44,7 +44,7 @@ class Encoder {
     return `${inits}${closings}`;
   }
 
-  static encodeToken (token?: Token, index = 0): Mediate {
+  static encodeToken (token: Token, index = 0): Mediate {
     if (!token || !isInstanceOf(token, Token)) {
       throw new Error('token should be instanceof Token');
     }