类型别名 SetFields<TSchema>

SetFields: {
    readonly [key in KeysOfAType<TSchema, ReadonlyArray<any> | undefined>]?:
        | OptionalId<Flatten<TSchema[key]>>
        | AddToSetOperators<OptionalId<Flatten<TSchema[key]>>[]>
} & NotAcceptedFields<TSchema, ReadonlyArray<any> | undefined> & {
    readonly [key: string]: any;
}