Type Alias Opaque<TPrimary, TUnique>

Opaque: TPrimary & { _type?: TUnique }

Wrapper for primitive types to prevent accidental wrong assignments.

TPrimary
The primary type that is being wrapped.
TUnique extends symbol
A unique symbol to differentiate this opaque type from others.

Optional_type?: TUnique
Unique symbol to differentiate this opaque type from others.

type MyString = Opaque<string, typeof _MyString>;
declare const _MyString: unique symbol;