feat(ext/kv): return versionstamp from set/commit (#18512)

This commit updates the `Deno.Kv` API to return the new commited
versionstamp for the mutated data from `db.set` and `ao.commit`. This is
returned in the form of a `Deno.KvCommitResult` object that has a
`versionstamp` property.

1 files changed, 7 insertions, 5 deletions

diff --git a/ext/kv/01_db.ts b/ext/kv/01_db.ts
index 70e4c7fca..e0c5335e6 100644
--- a/ext/kv/01_db.ts
+++ b/ext/kv/01_db.ts
@@ -111,14 +111,15 @@ class Kv {
       [key, "set", value],
     ];
 
-    const result = await core.opAsync(
+    const versionstamp = await core.opAsync(
       "op_kv_atomic_write",
       this.#rid,
       checks,
       mutations,
       [],
     );
-    if (!result) throw new TypeError("Failed to set value");
+    if (versionstamp === null) throw new TypeError("Failed to set value");
+    return { versionstamp };
   }
 
   async delete(key: Deno.KvKey) {
@@ -255,15 +256,16 @@ class AtomicOperation {
     return this;
   }
 
-  async commit(): Promise<boolean> {
-    const result = await core.opAsync(
+  async commit(): Promise<Deno.KvCommitResult | null> {
+    const versionstamp = await core.opAsync(
       "op_kv_atomic_write",
       this.#rid,
       this.#checks,
       this.#mutations,
       [], // TODO(@losfair): enqueue
     );
-    return result;
+    if (versionstamp === null) return null;
+    return { versionstamp };
   }
 
   then() {