When building widget of helloworld-service, some files are missing (eg. all js file of htdocs)

Files are in build/package

tree build/package
package
├── bin
├── config.xml
├── etc
├── htdocs
│ ├── AFB-websock.js
│ ├── assets
│ │ ├── background_iot_bzh_light.jpg
│ │ ├── favicon.ico
│ │ └── iot-bzh-logo-small.png
│ ├── index.html
│ ├── iotbzh-Binding.css
│ └── iotbzh-Binding.js
├── icon.png
├── lib
│ ├── afb-helloworld-skeleton.so
│ └── afb-helloworld-subscribe-event.so
└── var

6 directories, 11 files

But are not embed in widget

unzip -l agl-service-helloworld.wgt
Archive: agl-service-helloworld.wgt
Length Date Time Name
--------- ---------- ----- ----
0 2019-06-27 09:54 bin/
656 2019-06-27 09:54 config.xml
0 2019-06-27 09:54 etc/
0 2019-06-27 09:54 htdocs/
10651 2019-06-27 09:54 icon.png
0 2019-06-27 09:54 lib/
0 2019-06-27 09:54 var/
--------- -------
11307 7 files