Makes a union 'strict', such that members are disallowed from including the keys of other members. E.g., {x: 1, y: 1} is a valid member of {x: number} | {y: number} but not of StrictUnion<{x: number} | {y: number}>.
{x: 1, y: 1}
{x: number} | {y: number}
Makes a union 'strict', such that members are disallowed from including the keys of other members. E.g.,
{x: 1, y: 1}is a valid member of{x: number} | {y: number}but not of StrictUnion<{x: number} | {y: number}>.