sites/tasks/build-spec.js
'use strict';
var gulp = require('gulp');
var webpack = require('webpack-stream');
var configBuilder = require('../config/webpack.js');
gulp.task('build-spec', ['prepare-build'], function () {
var config = configBuilder.spec("development");
return gulp.src(config.entry)
.pipe(webpack(config))
.pipe(gulp.dest("./build/spec/js"));
});