From 998c037265fce02864b26e78452b76a33402a663 Mon Sep 17 00:00:00 2001
From: Mofei Zhang <feifei0@meta.com>
Date: Mon, 5 Aug 2024 22:20:48 -0400
Subject: [PATCH] [compiler][repro] ValidatePreserveMemo x useRef bug

[ghstack-poisoned]
---
 ...e-mutable-ref-memo-not-preserved.expect.md | 45 +++++++++++++++++++
 ...ug-maybe-mutable-ref-memo-not-preserved.ts | 14 ++++++
 2 files changed, 59 insertions(+)
 create mode 100644 compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-maybe-mutable-ref-memo-not-preserved.expect.md
 create mode 100644 compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-maybe-mutable-ref-memo-not-preserved.ts

diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-maybe-mutable-ref-memo-not-preserved.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-maybe-mutable-ref-memo-not-preserved.expect.md
new file mode 100644
index 0000000000000..ce19a1dc4eac0
--- /dev/null
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-maybe-mutable-ref-memo-not-preserved.expect.md
@@ -0,0 +1,45 @@
+
+## Input
+
+```javascript
+// @validatePreserveExistingMemoizationGuarantees:true
+
+import {useRef, useMemo} from 'react';
+import {makeArray} from 'shared-runtime';
+
+function useFoo() {
+  const r = useRef();
+  return useMemo(() => makeArray(r), []);
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: useFoo,
+  params: [],
+};
+
+```
+
+## Code
+
+```javascript
+// @validatePreserveExistingMemoizationGuarantees:true
+
+import { useRef, useMemo } from "react";
+import { makeArray } from "shared-runtime";
+
+function useFoo() {
+  const r = useRef();
+  let t0;
+  t0 = makeArray(r);
+  return t0;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: useFoo,
+  params: [],
+};
+
+```
+      
+### Eval output
+(kind: ok) [{}]
\ No newline at end of file
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-maybe-mutable-ref-memo-not-preserved.ts b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-maybe-mutable-ref-memo-not-preserved.ts
new file mode 100644
index 0000000000000..13b8b445827fa
--- /dev/null
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/bug-maybe-mutable-ref-memo-not-preserved.ts
@@ -0,0 +1,14 @@
+// @validatePreserveExistingMemoizationGuarantees:true
+
+import {useRef, useMemo} from 'react';
+import {makeArray} from 'shared-runtime';
+
+function useFoo() {
+  const r = useRef();
+  return useMemo(() => makeArray(r), []);
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: useFoo,
+  params: [],
+};