formatting-woes.js

// 1
var obj = new C()
  .chainedMethod1()
  .chainedMethod2()

// 2
var obj = new C({
  opt: true
})

// but 3
var obj = new C({
    opt: true
  })
  .chainedMethod1()
  .chainedMethod2()

I always avoid chains because I hate having to reformat code to debug it.

var obj = new C()
  .chainedMethod1()
  .chainedMethod2()
// wait, what is happening at chainedMethod1?

var obj = new C()
obj.chainedMethod1()
debugger;
obj.chainedMethod2()

Also, stepping into the second item in a chain is difficult, but super easy if you don't chain.