wip: zen

1 files changed, 18 insertions, 0 deletions

diff --git a/packages/cloud/core/src/util/memo.ts b/packages/cloud/core/src/util/memo.ts
new file mode 100644
index 000000000..49043010f
--- /dev/null
+++ b/packages/cloud/core/src/util/memo.ts
@@ -0,0 +1,18 @@
+export function memo<T>(fn: () => T, cleanup?: (input: T) => Promise<void>) {
+  let value: T | undefined
+  let loaded = false
+
+  const result = (): T => {
+    if (loaded) return value as T
+    loaded = true
+    value = fn()
+    return value as T
+  }
+  result.reset = async () => {
+    if (cleanup && value) await cleanup(value)
+    loaded = false
+    value = undefined
+  }
+
+  return result
+}