fix: export clients as both const and type (#841)

Author: alexander-fenster

synthtool/gcp/templates/node_split_library/index.ts.j2

@@ -17,7 +17,8 @@
 // ** All changes to this file may be overwritten. **
 
 {% for version in versions %}import * as {{ version }} from './{{ version}}';{{ "\n" }}{% endfor %}
-{% for client in clients %}const {{ client }} = {{ default_version }}.{{ client }};{{ "\n" }}{% endfor %}
+{% for client in clients %}const {{ client }} = {{ default_version }}.{{ client }};
+type {{ client }} = {{ default_version }}.{{ client }};{{ "\n" }}{% endfor %}
 export {{ "{" }}{{ versions|join(', ')}}, {{ clients|join(', ')}}{{ "}" }};
 export default {{ "{" }}{{ versions|join(', ')}}, {{ clients|join(', ')}}{{ "}" }};
 import * as protos from '../protos/protos';

tests/fixtures/node_templates/index_samples/sample_index.ts

@@ -20,6 +20,7 @@ import * as v1 from './v1';
 import * as v1beta1 from './v1beta1';
 
 const TextToSpeechClient = v1.TextToSpeechClient;
+type TextToSpeechClient = v1.TextToSpeechClient;
 
 export {v1, v1beta1, TextToSpeechClient};
 export default {v1, v1beta1, TextToSpeechClient};

tests/fixtures/node_templates/index_samples/src/index.ts

@@ -20,6 +20,7 @@ import * as v1 from './v1';
 import * as v1beta1 from './v1beta1';
 
 const TextToSpeechClient = v1.TextToSpeechClient;
+type TextToSpeechClient = v1.TextToSpeechClient;
 
 export {v1, v1beta1, TextToSpeechClient};
 export default {v1, v1beta1, TextToSpeechClient};