The method for obtaining the type of a union that is nested in TypeScript is to use a conditional type that checks if the input type is a union or not. If it is a union, the type of each element in the union is recursively obtained and returned in a new union. Here is an example:
type FlattenUnion<T> = T extends infer U ? U : never;
type NestedUnion = { a: string } | { b: number } | { c: boolean };
type FlatUnion = FlattenUnion<NestedUnion>; // { a: string } | { b: number } | { c: boolean }
In this example, NestedUnion
is a type that represents a union of three different object types. By applying FlattenUnion
to NestedUnion
, the resulting type FlatUnion
is a union of the individual property types from each object type.
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Asked: 2023-06-11 16:42:03 +0000
Seen: 9 times
Last updated: Jun 11 '23
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