A check to perform as part of a [`Deno.AtomicOperation`](../././~/Deno.AtomicOperation). The check will fail if the versionstamp for the key-value pair in the KV store does not match the given versionstamp. A check with a `null` versionstamp checks that the key-value pair does not currently exist in the KV store.

Properties

key: KvKey

versionstamp: string | null