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 utility.js
 
 function generateRandom() {
    return Math.random();
}
 
function sum(a, b) {
    return a + b;
}
 
export { generateRandom, sum }


app.js

import { generateRandom, sum } from './utility';
 
console.log(generateRandom());
console.log(sum(1, 2));



npm install -g rollup

rollup app.js --o bundle.js --f es



///Using in gulp
http://lazamar.github.io/up-and-running-with-rollup-js-in-gulp-grunt-and-native-js-api/