How to read an external file list with grunt

I'm trying to concatenate and then babelify and uglify files with Grunt.

I'd like to read an external file list, from a file where the files are written one for each line, newline separated.

I'm trying to use the following GruntFile.js, but Grunt says (after I added the src=['<%= jsFiles.toString().split("\n") %>'] line):

Running "browserify:dist1" (browserify) task
Warning: An error occurred while processing a template (Invalid or unexpected token). Use --force to continue.

Where is the error?

This is the GruntFile.js

module.exports = function(grunt) {
  grunt.initConfig({
    jsFiles: grunt.file.read('scripts/s.list'),
    env: {
        prod: {
            NODE_ENV: 'production'
        }
    },
    browserify: {
      dist1: {
        options: {
           transform: [
             ['babelify', {presets: ['es2015']}]
           ]
        },
        src: ['<%= jsFiles.toString().split("\n") %>'],
        dest: '/WebContent/js/libs/s.bundle.js'
      },
    },
    uglify: {
        my_target1: {
          files: {
            '/WebContent/js/libs/s.bundleuglified.js': ['/WebContent/js/libs/s.bundle.js']
          }
        },
      }    
  });

  grunt.loadNpmTasks('grunt-contrib-uglify');
  grunt.loadNpmTasks('grunt-contrib-watch');
  grunt.loadNpmTasks('grunt-browserify');
  grunt.loadNpmTasks('grunt-env');
  grunt.registerTask('default', ['release']);
  grunt.registerTask('release', ['env', 'browserify', 'uglify']);
};

Edit: I added a backslash to \n and the error has gone, but the babelify task gives me an empty file...

Edit2: I was able to read the file list using the following two lines at the beginning of the GruntFile.js

  const jsFiles = grunt.file.read('scripts/s.list');
  const jsFilesArray = jsFiles.toString().split("\n");

and then

src: jsFilesArray.slice(0, jsFilesArray.length-1),

because the last element was '' and it gave the error Warning: must provide pattern” as Beniamin H suggested.

Edit3: I found that the babelify task was reading the files in alphabetical order, so I had to first concat them, as explained here, and then babelify and uglify