requirebin sketch

index.js

// require something
var _ = require('lodash')
var news = _.merge({a: [1]},{a: [2]})
var news2 = _arrayMerge({a: [1]},{a: [2]})

function _arrayMerge(obj1, obj2){
  return _.merge(obj1, obj2, function(a, b) {
    return _.isArray(a) ? a.concat(b) : undefined;
  })
}

console.log(news)
console.log(news2)

minified.js

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