add errors iterator to MultiErrorReply

Author: leibale

packages/client/lib/client/index.spec.ts

@@ -295,6 +295,7 @@ describe('Client', () => {
           assert.equal(err.replies.length, 2);
           assert.deepEqual(err.errorIndexes, [1]);
           assert.ok(err.replies[1] instanceof ErrorReply);
+          assert.deepEqual([...err.errors()], [err.replies[1]]);
           return true;
         }
       );

packages/client/lib/errors.ts

@@ -79,4 +79,10 @@ export class MultiErrorReply extends ErrorReply {
     this.replies = replies;
     this.errorIndexes = errorIndexes;
   }
+
+  *errors() {
+    for (const index of this.errorIndexes) {
+        yield this.replies[index];
+    }
+  }
 }