From 1f14f194396bf9296a1046d3f680d6d318cd0e40 Mon Sep 17 00:00:00 2001
From: edison <daiwei521@126.com>
Date: Thu, 14 Apr 2022 08:06:58 +0800
Subject: [PATCH] fix(reactivity-transform): should not rewrite catch param
 (#5711)

fix #5709
---
 .../__snapshots__/reactivityTransform.spec.ts.snap     |  5 +++++
 .../__tests__/reactivityTransform.spec.ts              |  6 ++++++
 .../reactivity-transform/src/reactivityTransform.ts    | 10 ++++++++++
 3 files changed, 21 insertions(+)

diff --git a/packages/reactivity-transform/__tests__/__snapshots__/reactivityTransform.spec.ts.snap b/packages/reactivity-transform/__tests__/__snapshots__/reactivityTransform.spec.ts.snap
index 73b5db93..99be2421 100644
--- a/packages/reactivity-transform/__tests__/__snapshots__/reactivityTransform.spec.ts.snap
+++ b/packages/reactivity-transform/__tests__/__snapshots__/reactivityTransform.spec.ts.snap
@@ -216,6 +216,11 @@ exports[`should not rewrite scope variable 1`] = `
         console.log(d.value)
         console.log(e)
       }
+      let err = _ref(null)
+      try {
+      } catch (err) {
+        console.log(err)
+      }
     "
 `;
 
diff --git a/packages/reactivity-transform/__tests__/reactivityTransform.spec.ts b/packages/reactivity-transform/__tests__/reactivityTransform.spec.ts
index 9f24d266..ece6e351 100644
--- a/packages/reactivity-transform/__tests__/reactivityTransform.spec.ts
+++ b/packages/reactivity-transform/__tests__/reactivityTransform.spec.ts
@@ -222,12 +222,18 @@ test('should not rewrite scope variable', () => {
         console.log(d)
         console.log(e)
       }
+      let err = $ref(null)
+      try {
+      } catch (err) {
+        console.log(err)
+      }
     `)
   expect(code).toMatch('console.log(a)')
   expect(code).toMatch('console.log(b.value)')
   expect(code).toMatch('console.log(c)')
   expect(code).toMatch('console.log(d.value)')
   expect(code).toMatch('console.log(e)')
+  expect(code).toMatch('console.log(err)')
   assertCode(code)
 })
 
diff --git a/packages/reactivity-transform/src/reactivityTransform.ts b/packages/reactivity-transform/src/reactivityTransform.ts
index a67d8432..809e3e4e 100644
--- a/packages/reactivity-transform/src/reactivityTransform.ts
+++ b/packages/reactivity-transform/src/reactivityTransform.ts
@@ -566,6 +566,16 @@ export function transformAST(
         return
       }
 
+      // catch param
+      if (node.type === 'CatchClause') {
+        scopeStack.push((currentScope = {}))
+        if (node.param && node.param.type === 'Identifier') {
+          registerBinding(node.param)
+        }
+        walkScope(node.body)
+        return
+      }
+
       // non-function block scopes
       if (node.type === 'BlockStatement' && !isFunctionType(parent!)) {
         scopeStack.push((currentScope = {}))