Yeah, it was wrong, I'm currently using like
```js
let ret = { ... ( couldBeNull ? {couldBeNull} : {} ) }
```
Yours is better and the usual idiom a bit hard to understand.
What I'm proposing is something like this
```js
let ret = { couldBeNull? }
```
or if you want a different name for the property
```js
let ret = { bar ?: couldBeNull }
```
It is not like there is no way to do this, there are plenty. But this way could
make code a bit easier to read.
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