Extend Jsonify type to handle Tagged types
I’m using Tagged types in combination with Jsonify-ed types. It seems that tagged types aren’t unwrapped when creating their JSON type.
Am I missing something or is that an option for improvement?
Here’s the sample code that I’m using:
import type { Tagged, Jsonify } from 'type-fest'
export type UserId = Tagged<number, 'UserId'>
class User extends BaseModel {
declare id: UserId
}
// then I’m extracting the DTO and DTO-JSON types
export interface UserDto {
id: User['id']
}
export type UserDtoJson = Jsonify<UserDto>
// type UserDtoJson = {
// id: UserId; ⚠️ still the tagged type, not the actual type
// }I was hoping the UserDtoJson type would have the following shape:
type UserDtoJson = {
id: number;
}Using Unwrapped for the DTO type resolve the expected, unwrapped type from the tagged type:
import type { UnwrapTagged, Jsonify } from 'type-fest'
export interface UserDto {
id: UnwrapTagged<User['id']>
}
export type UserDtoJson = Jsonify<UserDto>
// type UserDtoJson = {
// id: number; ✅ the expected result
// }Is extending the Jsonify type an option to resolve tagged types and unwrap them automatically?
sindresorhus / type-fest
A collection of essential TypeScript types
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