From badfabb9c19a29044dd8c56fac649c45c452917a Mon Sep 17 00:00:00 2001
From: Dave McCabe <davemccabe@fb.com>
Date: Mon, 17 May 2021 22:54:05 -0700
Subject: [PATCH] TypeScript snapshot.retain

Summary: see title

Reviewed By: drarmstr

Differential Revision: D28489327

fbshipit-source-id: 73949e38084fe01f260f6d8de7c0f19d80a95c55
---
 typescript/index.d.ts | 1 +
 typescript/tests.ts   | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/typescript/index.d.ts b/typescript/index.d.ts
index 6434db13d..9b6e42a3c 100644
--- a/typescript/index.d.ts
+++ b/typescript/index.d.ts
@@ -55,6 +55,7 @@ export class Snapshot {
   getInfo_UNSTABLE<T>(recoilValue: RecoilValue<T>): AtomInfo<T>;
   map(cb: (mutableSnapshot: MutableSnapshot) => void): Snapshot;
   asyncMap(cb: (mutableSnapshot: MutableSnapshot) => Promise<void>): Promise<Snapshot>;
+  retain(): () => void;
 }
 
 export class MutableSnapshot extends Snapshot {
diff --git a/typescript/tests.ts b/typescript/tests.ts
index ab3367c44..fb14b46f2 100644
--- a/typescript/tests.ts
+++ b/typescript/tests.ts
@@ -214,6 +214,9 @@ useRecoilCallback(({ snapshot, set, reset, gotoSnapshot }) => async () => {
   set(myAtom, 5);
   set(myAtom, 'hello'); // $ExpectError
   reset(myAtom);
+
+  const release = snapshot.retain();
+  release();
 });
 
 /**