This is a simple Sveltejs widget used by ckanext-validation to upload resource files to a CKAN instance.
$ npm i
$ npm run build
This will build the js and css on the dist/ folder. To use them in ckanext-validation you do need to copy them to:
$ cp dist/ckan-uploader.umd.cjs ../ckanext-validation/ckanext/validation/webassets/js/ckan-uploader.js
$ cp dist/style.css ../ckanext-validation/ckanext/validation/webassets/css/ckan-uploader.css