From eb1ce8c73004f7d231a27bd100e7b47e29c86aa7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=BE=99=E8=85=BE=E9=81=93?= <LongTengDao@LongTengDao.com>
Date: Wed, 31 Aug 2022 18:49:56 +0800
Subject: [PATCH] support catch without error (#58)

---
 index.js                             | 2 +-
 test/fixtures/catch-without-error.js | 1 +
 test/index.js                        | 3 +++
 3 files changed, 5 insertions(+), 1 deletion(-)
 create mode 100644 test/fixtures/catch-without-error.js

diff --git a/index.js b/index.js
index 232cbe4..0bbf023 100644
--- a/index.js
+++ b/index.js
@@ -132,7 +132,7 @@ function findGlobals(source, options) {
     },
     'Class': declareClass,
     'TryStatement': function (node) {
-      if (node.handler === null) return;
+      if (node.handler === null || node.handler.param === null) return;
       node.handler.locals = node.handler.locals || Object.create(null);
       declarePattern(node.handler.param, node.handler);
     },
diff --git a/test/fixtures/catch-without-error.js b/test/fixtures/catch-without-error.js
new file mode 100644
index 0000000..30fa5a4
--- /dev/null
+++ b/test/fixtures/catch-without-error.js
@@ -0,0 +1 @@
+try{}catch{}
diff --git a/test/index.js b/test/index.js
index fb1a9d1..de8b97a 100644
--- a/test/index.js
+++ b/test/index.js
@@ -43,6 +43,9 @@ test('assign_implicit.js - assign from an implicit global', function () {
 test('catch-pattern.js - pattern in catch', function () {
   assert.deepEqual(detect(read('catch-pattern.js')), []);
 });
+test('catch-without-error.js - catch without error', function () {
+  assert.deepEqual(detect(read('catch-without-error.js')), []);
+});
 test('class.js - ES2015 classes', function () {
   assert.deepEqual(detect(read('class.js')).map(nameOf), ['G', 'OtherClass_', 'SuperClass', 'this'].sort());
 });