type-fest@3 - How to declare optional properties in JsonObject?
After the update to version 3.0.0, it is no longer possible to have optional properties on a JsonObject:
import { JsonObject } from "type-fest";
interface MyObject extends JsonObject {
optionalProp?: string
}Gives a TypeError:
(property) MyObject.optionalProp?: string | undefined
Property 'optionalProp' of type 'string | undefined' is not assignable to 'string' index type '((string | number | boolean | JsonObject | JsonArray) & (string | number | boolean | JsonObject | JsonArray | undefined)) | null'.ts(2411)
How should this type be used correctly? The code above worked fine with version 2.x.
sindresorhus / type-fest
A collection of essential TypeScript types
14.5k
How does funding with Polar work?
1
Pay now to fund the work behind this issue.
2
Get updates on progress being made.
3
Maintainer is rewarded once the issue is completed.
FAQ
Backer
You're funding impactful open source efforts
Contributor
You want to contribute to this effort
Maintainer
You want to get funding like this too