oops make sure empty uint8array works

Author: jackyzha0

codec/codec.test.ts

@@ -17,6 +17,11 @@ describe.each(codecs)('codec -- $name', ({ codec }) => {
     expect(codec.fromBuffer(codec.toBuffer(msg))).toStrictEqual(msg);
   });
 
+  test('encodes the empty buffer properly', () => {
+    const msg = { test: new Uint8Array(0) };
+    expect(codec.fromBuffer(codec.toBuffer(msg))).toStrictEqual(msg);
+  });
+
   test('skips optional fields', () => {
     const msg = { test: undefined };
     expect(codec.fromBuffer(codec.toBuffer(msg))).toStrictEqual({});

codec/json.ts

@@ -51,7 +51,7 @@ export const NaiveJsonCodec: Codec = {
     const parsed = JSON.parse(
       decoder.decode(buff),
       function reviver(_key, val: unknown) {
-        if ((val as Base64EncodedValue | undefined)?.$t) {
+        if ((val as Base64EncodedValue | undefined)?.$t !== undefined) {
           return base64ToUint8Array((val as Base64EncodedValue).$t);
         } else {
           return val;