Limit logger size via DEBUG_MAX (#802)

* Limit logger size via DEBUG_MAX

* Any negative disables

* Node imports

* Update test

packages/x-textdecoder/src/node.ts

@@ -1,8 +1,8 @@
 // Copyright 2017-2020 @polkadot/x-textencoder authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-import { TextDecoder as NodeTextDecoder } from 'util';
+import util from 'util';
 
 export const TextDecoder = typeof global.TextDecoder === 'undefined'
-  ? NodeTextDecoder as unknown as typeof global.TextDecoder
+  ? util.TextDecoder as unknown as typeof global.TextDecoder
   : global.TextDecoder;