Theo's Typesafe Cult•2y ago

Conditionally required types

Someone that has any ideas on how I can make everything required if accepted is true, if it's false then the other 3 fields are not required.

type GeoLocation = {
  accepted: boolean;
  accuracy?: number;
  longitude?: number;
  latitude?: number;
};

type GeoLocation = {
  accepted: boolean;
  accuracy?: number;
  longitude?: number;
  latitude?: number;
};

3 Replies

batata•2y ago

this logic seems off

Brendonovich•2y ago

How's this?

type GeoLocation = {
  accepted: true;
  accuracy: number;
  longitude: number;
  latitude: number;
} | {
  accepted: false;
  accuracy?: number;
  longitude?: number;
  latitude?: number;
}

type GeoLocation = {
  accepted: true;
  accuracy: number;
  longitude: number;
  latitude: number;
} | {
  accepted: false;
  accuracy?: number;
  longitude?: number;
  latitude?: number;
}

Could also move accuracy, longitude and latitude into a separate type and Partial it for the accepted: false case

barry•2y ago

I would rather overload here than this but yeh

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Conditionally required types