TextEncoder allows non-Uint8Array Buffers (#596)

* TextEncoder allows non-Uint8Array Buffers

* Add eslintrc to eslintignore

packages/util/src/buffer/toU8a.spec.ts

@@ -8,7 +8,7 @@ describe('bufferToU8a', (): void => {
   it('returns an empty buffer when null provided', (): void => {
     expect(
       bufferToU8a(null)
-    ).toEqual(new Uint8Array([]));
+    ).toEqual(new Uint8Array());
   });
 
   it('returns a Uint8Buffer with the correct values', (): void => {

packages/util/src/buffer/toU8a.ts

@@ -17,9 +17,5 @@
  * ```
  */
 export default function bufferToU8a (buffer?: Buffer | number[] | null): Uint8Array {
-  if (!buffer) {
-    return new Uint8Array([]);
-  }
-
-  return new Uint8Array(buffer);
+  return new Uint8Array(buffer || []);
 }