Adding keys conditionally in 2025

Maybe this is a ES6 thing, but I use Object.create. Since we're way past 2012 and the thread is still relevant, if someone's still looking for a solution to add keys conditionally.

Many times I have encountered a situation where it is preferred that the key is not present itself.

Here's what I use, when I want to have the keys conditionally applied

Object.create({
  someKey: (condition) ? value : undefined,
})

If the condition results to false, then you'll get {} instead of { someKey: undefined }