Flow hook to minify the resulting javascript code (stores it in {{app.name}}.min.js).

minify.js

// ./hooks/minify.js
var UglifyJS = require("uglify-js"); // run "npm install uglify-js" in the hooks directory first!
var fs = require('fs');

exports.hook = function(flow, done) {
	var basePath = flow.project.project.app.output + '/web/' + flow.project.project.app.name;
	var result = UglifyJS.minify(basePath + '.js', {
		mangle: true // set to false if you run into issues
	});
	fs.writeFile(basePath + '.min.js', result.code, function(err) {
		if(err) console.log(err);
		done();
	})
}

project.flow

// ./project.flow
{
	project: {
	  // ...
		build: {
		// ...
			post: {
				priority: 1,
				name: 'minify',
				desc: 'minify the resulting javascript using uglifyjs',
				script: './hooks/minify.js'
			}
		}
	}
}