gulpSequenceTask.js

var list = [{
    name: 'base',
    src: [],
    filename: 'base.js',
    dest: []
}];
var createJSTask = function (opt) {
    gulp.task(opt.name, function () {
        return gulp.src(opts.src)
            .pipe(gulp.dest(opts.dest));
    });
    return 'js-' + opt.name;
};

var createSequenceTask = function (list, taskCreater) {
    return list.map(function (opt) {
        return createJSTask(opt);
    });
};

var deps = createSequenceTask(list, createJSTask);
gulp.task('build-js', deps);