feat: add filepath to esm index.ts file (#1900)

* feat: add filepath to esm index.ts file

Author: sofisl

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

@@ -16,7 +16,7 @@
 // ** https://github.com/googleapis/synthtool **
 // ** All changes to this file may be overwritten. **
 
-{% for version in versions %}import * as {{ version }} from './{{ version}}.js';{{ "\n" }}{% endfor %}
+{% for version in versions %}import * as {{ version }} from './{{ version}}/index.js';{{ "\n" }}{% endfor %}
 {% for client in clients %}const {{ client }} = {{ default_version }}.{{ client }};
 type {{ client }} = {{ default_version }}.{{ client }};{{ "\n" }}{% endfor %}
 export {{ "{" }}{{ versions|join(', ')}}, {{ clients|join(', ')}}{{ "}" }};

tests/fixtures/node_templates/index_esm_samples/esm/src/index.ts

@@ -16,8 +16,8 @@
 // ** https://github.com/googleapis/synthtool **
 // ** All changes to this file may be overwritten. **
 
-import * as v1 from './v1.js';
-import * as v1beta1 from './v1beta1.js';
+import * as v1 from './v1/index.js';
+import * as v1beta1 from './v1beta1/index.js';
 
 const TextToSpeechClient = v1.TextToSpeechClient;
 type TextToSpeechClient = v1.TextToSpeechClient;

tests/fixtures/node_templates/index_esm_samples/sample_index.ts

@@ -16,8 +16,8 @@
 // ** https://github.com/googleapis/synthtool **
 // ** All changes to this file may be overwritten. **
 
-import * as v1 from './v1.js';
-import * as v1beta1 from './v1beta1.js';
+import * as v1 from './v1/index.js';
+import * as v1beta1 from './v1beta1/index.js';
 
 const TextToSpeechClient = v1.TextToSpeechClient;
 type TextToSpeechClient = v1.TextToSpeechClient;

tests/fixtures/nodejs_mono_repo_esm/packages/dlp/esm/src/index.ts

@@ -16,7 +16,7 @@
 // ** https://github.com/googleapis/synthtool **
 // ** All changes to this file may be overwritten. **
 
-import * as v2 from './v2.js';
+import * as v2 from './v2/index.js';
 
 const DlpServiceClient = v2.DlpServiceClient;
 type DlpServiceClient = v2.DlpServiceClient;