Example for "Extract object structure by usage". This would help refactoring an old code base where the structure of some arguments are not exactly known, or when testing and it is necessary to mock a dependency and you have to pass a object with the same structure for instance

test.js

function foo (options, meta, callback) {
  console.log(options.propOne)
  console.log(options.propTwo[0].foo)
  console.log(options.propTwo[0].bar)
  console.log(options.propThree.subProp.hello)
  meta.foo = 'bar'
}

// A IDE could extract the structure of `options` as JSON
// and copy that structure into the clipboard (functionality could be found in a context menu for example)
{
  propOne: null,
    propTwo = [
      {foo:null, bar:null}
    ],
    propThree: {
      subProp: {
        hello: null
      }
    }
}