Delete undefined props?

[SrBrahma]

A common practice to deeply remove undefined properties from objects is to use JSON.parse(JSON.stringify(data));. I can't use it on my current situation as it would remove the types that superjson supports.

It's possible to somehow make superjson to remove undefined props to use it like JSON.parse(JSON.stringify(data));?

[Skn0tt]

Hi @SrBrahma! SuperJSON was designed to transmit JS values over the network, while keeping the object as similar as possible. It was originally motivated by Blitz's RPC mechanism, where the network layer is abstracted away from devs.

Part of that is to persist the difference between { foo: undefined } and {}, which behave differently when passed e.g. to Object.keys, Object.values or Object.entries.

If you want to remove undefined props from an object, I recommend you to either write a small traversal algorithm yourself, or to use something like deep-cleaner.

[SrBrahma]

My issue was originally with MongoDB, it was converting undefined props to null. Internally, it uses BSON. I discovered that Mongo has the ignoreUndefined option, that is later passed to the BSON serializer and removes them!