ft/aurelia_project/tasks/copy-js.js

import gulp from 'gulp';

function copyJsFilesToPL() {
  let sourceJsFiles = [ 'assets/js/*.js', 'assets/js/*.map' ];
  let destinationJs = '../pattern-library/public/assets/js/';
  return gulp.src(sourceJsFiles)
		.pipe(gulp.dest(destinationJs));
}

export default gulp.series(
  copyJsFilesToPL
);