pan class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">user</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">let</span> username <span class="token operator">=</span> user<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'username'</span><span class="