const decider = require('node-ab-decider')
const choosen = "oldVariant"
const experiments = {
  variantA: {
    weight: 10,
    url: "https://exp-a.example.com/"
  },
  variantB: {
    weight: 20,
    url: "https://exp-b.example.com/"
  }
}
const x = decider(experiments, choosen)
// possible "x" value: {weight: 10, name:"variantA", url: "https://exp-a.example.com/"}

var app = require('express')();
const {middleware} = require('node-ab-decider')
 
const experiments = {
  variantA: {
    weight: 10,
    url: "https://exp-a.example.com/"
  },
  variantB: {
    weight: 20,
    url: "https://exp-b.example.com/"
  }
}
 
app.use(middleware(experiments, {
  // ...opts
}), (req,res)=>res.send('original'))
 
app.listen(2323,()=>console.log('running on 2323'))