Custom "stylus + if-ie.styl + autoprefixer" tech for ENB project. Destination `.bem/techs`

css-stylus-with-if-ie.js

var autoprefixer = require('autoprefixer');

module.exports = require('enb-stylus/techs/css-stylus').buildFlow()
    .name('css-stylus-with-if-ie')
	.defineOption('browsers')
	.defineOption('autoprefixerArguments')
    .methods({
        _configureRenderer: function(renderer) {
	        var args = this._browsers || this._autoprefixerArguments;

	        renderer.include('./node_modules');
	        renderer.import('if-ie.styl/if-ie');
	        renderer.use(function (style) {
		        this.on('end', function (err, css) {
			        return args ?
				        autoprefixer.apply(this, {browsers: args}).process(css).css :
				        autoprefixer.process(css).css;
		        });
	        });
			return renderer;
        }
    })
    .createTech();