Optional form of T whose properties may also be explicitly
undefined — the input-side counterpart of Partial<T> under
exactOptionalPropertyTypes (whose mapped ? does not admit a
present-undefined key). For inputs whose runtime treats a
present-undefined key exactly like an absent one.
Optional form of
Twhose properties may also be explicitlyundefined— the input-side counterpart ofPartial<T>underexactOptionalPropertyTypes(whose mapped?does not admit a present-undefinedkey). For inputs whose runtime treats a present-undefinedkey exactly like an absent one.