wishthis/semantic/tasks/config/admin/templates/less-package.js

let
    where = 'client' // Adds files only to the client
;

Package.describe({
    name: 'semantic:ui',
    summary: 'Fomantic UI - LESS only distribution',
    version: '{version}',
    git: 'git://github.com/fomantic/Fomantic-UI-LESS.git',
});

Package.onUse(function (api) {
    api.versionsFrom('1.0');
    api.use('less', 'client');

    api.addFiles([
        { files: files },
    ], 'client');
});