first of, npm install --save-dev zepto-webpack
.
Then, in your Webpack config :
// ...
resolve: {
alias: {
ShoelaceDropDowns: path.resolve(__dirname, 'node_modules/shoelace-css/source/js/dropdowns.js'),
ShoelaceTabs: path.resolve(__dirname, 'node_modules/shoelace-css/source/js/tabs.js'),