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The export type of namespace presents the wrong typing alert #37408
Description
TypeScript Version: 3.7.2
Search Terms:
namespace, typing
Code
type Nullable<T> = T | null
export namespace ProfileFields {
type name = string;
type WHYYY = string | null;
type id = string | null;
// export type WHYYY = Nullable<string>;
// export type id = Nullable<string>;
}
export interface Profile {
name: ProfileFields.name;
WHYYY: ProfileFields.WHYYY;
id: ProfileFields.id;
}
export type General = Pick<Profile, 'WHYYY' | 'name' | 'id'>Expected behavior:
type General = {
WHYYY: ProfileFields.WHHYY
name: ProfileFields.name
id: ProfileFields.id
}Actual behavior:
type General = {
WHYYY: ProfileFields.WHHYY
name: ProfileFields.name
id: ProfileFields.WHHYY
}Playground Link: Provided
Activity
RyanCavanaugh commentedon Mar 16, 2020
Two type aliases for the same type are considered interchangeable (because they are), and declaration emit can choose arbitrarily between two equivalent types when finding a name to emit.
LenChang commentedon Mar 17, 2020
But it make me confused. I adjust the type of WHYYY & id to Nullable, and it make code more readable.
Has any better recommended method to use it ?
typescript-bot commentedon Mar 19, 2020
This issue has been marked 'Working as Intended' and has seen no recent activity. It has been automatically closed for house-keeping purposes.
RyanCavanaugh commentedon Mar 19, 2020
#37444 should improve this