Supporting unwanted undefined in object

[TommySorensen]

Is there any plans for supporting this use case?

clsx({undefined: false});

Will return undefined which is unwanted.

Im using clsx in a React.js solution with CSS Modules like this:

 <section
      className={clsx(
        styles.test,
        { [styles[someOtherThing!]]: !!someOtherThing }
      )}
    >

In this case someOtherThing can be undefined or null and since i am doing !!someOtherThing then clsx should never return the "undefined" value.

[lukeed]

It wouldn’t show up with false, so here !!someOtherThing is evaluating to true. And “undefined” is always a string when used as a key name. See #40 for more explanation — it’s native JS and is due to the [undefined]: true syntax