4 replies

Converting Nullish Fields to Optional in TypeScript

Is there a schema combinator/simple way to turn a "nullish" field into an "optional" one? (I'me fine just coercing

null

null

undefined

undefined

in this case)

Or, in code:

type From {
  // turn this
  foo?: string | undefined | null;
}

type To {
  // into this
  foo?: string | undefined;
}

type From {
  // turn this
  foo?: string | undefined | null;
}

type To {
  // into this
  foo?: string | undefined;
}

type From {
  // turn this
  foo?: string | undefined | null;
}

type To {
  // into this
  foo?: string | undefined;
}

type From {
  // turn this
  foo?: string | undefined | null;
}

type To {
  // into this
  foo?: string | undefined;
}

I can imagine perhaps converting to a proper

Option

Option

Option

Option type and then back again...but surely there's a simpler way?