Gulpfile.js

var babelTrans  = require('babel-register');
var gulp        = require('gulp');
var babel       = require('gulp-babel');
var mocha       = require('gulp-mocha');
var del         = require('del');
var nodeVersion = require('node-version');


gulp.task('clean', function () {
    return del('lib');
});

gulp.task('lint', function () {
    // TODO: eslint supports node version 4 or higher.
    // Remove this condition once we get rid of node 0.10 support.
    if (nodeVersion.major === '0')
        return null;

    var eslint = require('gulp-eslint');

    return gulp
        .src([
            'src/**/*.js',
            'test/**/*.js',
            'Gulpfile.js'
        ])
        .pipe(eslint())
        .pipe(eslint.format())
        .pipe(eslint.failAfterError());
});

gulp.task('build', ['clean', 'lint'], function () {
    return gulp
        .src('src/**/*.js')
        .pipe(babel())
        .pipe(gulp.dest('lib'));
});

gulp.task('test', ['build'], function () {
    return gulp
        .src('test/**.js')
        .pipe(mocha({
            compilers: {
                js: babelTrans
            },
            ui:       'bdd',
            reporter: 'spec',
            timeout:  typeof v8debug === 'undefined' ? 2000 : Infinity // NOTE: disable timeouts in debug
        }));
});