on() =&gt; &lt;String, dynamic&gt;{
      &#39;address&#39;: address,
      &#39;label&#39;: _addressLabelToString[label],
      &#39;customLabel&#39;: customLabel,
      &#39;street&#39;: street,
      &#39;pobox&#39;: pobox,
      &#39;neighborhood&#39;: neighborhood,
      &#39;city&#39;: city,
      &#39;state&#39;: state,
      &#39;postalCode&#39;: postalCode,
      &#39;country&#39;: country,
      &#39;isoCountry&#39;: isoCountry,
      &#39;subAdminArea&#39;: subAdminArea,
      &#39;subLocality&#3