Small Enum/EnumType cleanups for consistency (#759)

packages/types/package.json

@@ -30,8 +30,8 @@
   "homepage": "https://github.com/polkadot-js/api/tree/master/packages/types#readme",
   "dependencies": {
     "@babel/runtime": "^7.3.4",
-    "@polkadot/keyring": "^0.35.1",
-    "@polkadot/util": "^0.35.1",
+    "@polkadot/keyring": "^0.35.4",
+    "@polkadot/util": "^0.35.4",
     "core-js": "^2.6.5"
   }
 }

packages/types/src/codec/Enum.ts

@@ -65,6 +65,13 @@ export default class Enum extends Base<number> implements Codec {
     return 1;
   }
 
+  /**
+   * @description Returns the index for this value (equivalent to toNumber)
+   */
+  get index (): number {
+    return this.raw;
+  }
+
   /**
    * @description Checks if the value is an empty value (always false)
    */

packages/types/src/codec/EnumType.ts

@@ -133,7 +133,7 @@ export default class EnumType<T> extends Base<Codec> implements Codec {
    * @description Checks if the Enum points to a [[Null]] type
    */
   get isNone (): boolean {
-    return this.raw instanceof Null;
+    return this.isNull;
   }
 
   /**