From 1cf8d9bc8b8ce905ce55043707fffb0b0c504e4f Mon Sep 17 00:00:00 2001
From: Joe Savona <joesavona@fb.com>
Date: Wed, 20 Mar 2024 14:07:28 -0700
Subject: [PATCH] Repro for missing predecessor with try/catch

Found when running the compiler on a large swath of internal code.
PruneMaybeThrows rewrites terminals, but the logic to update subsequent phis was
incorrectly dropping phis rather than rewriting them. Fixed in the next PR.
---
 .../error.repro-preds-undefined.expect.md     | 28 +++++++++++++++++++
 .../compiler/error.repro-preds-undefined.js   | 13 +++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/error.repro-preds-undefined.expect.md
 create mode 100644 compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/error.repro-preds-undefined.js

diff --git a/compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/error.repro-preds-undefined.expect.md b/compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/error.repro-preds-undefined.expect.md
new file mode 100644
index 0000000000..587da7fd0c
--- /dev/null
+++ b/compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/error.repro-preds-undefined.expect.md
@@ -0,0 +1,28 @@
+
+## Input
+
+```javascript
+// @enableAssumeHooksFollowRulesOfReact @enableTransitivelyFreezeFunctionExpressions
+function useSupportsTouchEvent() {
+  return useMemo(() => {
+    if (checkforTouchEvents) {
+      try {
+        document.createEvent("TouchEvent");
+        return true;
+      } catch {
+        return false;
+      }
+    }
+  }, []);
+}
+
+```
+
+
+## Error
+
+```
+Cannot read properties of undefined (reading 'preds')
+```
+          
+      
\ No newline at end of file
diff --git a/compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/error.repro-preds-undefined.js b/compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/error.repro-preds-undefined.js
new file mode 100644
index 0000000000..a9500cb531
--- /dev/null
+++ b/compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/error.repro-preds-undefined.js
@@ -0,0 +1,13 @@
+// @enableAssumeHooksFollowRulesOfReact @enableTransitivelyFreezeFunctionExpressions
+function useSupportsTouchEvent() {
+  return useMemo(() => {
+    if (checkforTouchEvents) {
+      try {
+        document.createEvent("TouchEvent");
+        return true;
+      } catch {
+        return false;
+      }
+    }
+  }, []);
+}