Imagine you have an interface called X:
type X = {
red: number,
blue: string
}
Can a union type Y be created using mapped types? If not, are there other ways to construct it at the type level?
type Y = {
kind: "red"
payload: number
} | {
kind: "blue"
payload: string
}
Absolutely, leveraging the fact that T[keyof T] represents a union of values in T, regardless of the type of T, is key here. By using a mapped type, you can create a new type with branches that align with the specific union you desire:
type NewType = { [Key in keyof OriginalType]: {category: Key, data: OriginalType[Key]} }[keyof OriginalType]
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