gistfile1.txt

const buildScriptFile = (appName, gulp, plugins, buildFiles)
  => gulp.src(buildFiles)
    .pipe(plugins.sourcemaps.init())
    .pipe(babel({
      presets: ['env']
    })
    .pipe(plugins.concat(`${appName}.min.js`))
    //.pipe(plugins.uglify())
    .pipe(plugins.size({
      showFiles: true,
    }))
    .pipe(plugins.sourcemaps.write(''))
    .pipe(gulp.dest('Scripts'));

---------------------------------------------------
  => gulp.src(buildFiles)
  ^^
SyntaxError: Unexpected token =>