fix: mangle catch clause identifiers (#156)

Author: j4k0xb

packages/webcrack/src/transforms/mangle.ts

@@ -57,6 +57,8 @@ function inferName(path: NodePath<t.Identifier>): string {
     const init = path.parentPath.get('init');
     const suffix = (init.isExpression() && generateExpressionName(init)) || '';
     return generateUid(path.scope, 'v' + titleCase(suffix));
+  } else if (path.parentPath.isCatchClause()) {
+    return generateUid(path.scope, 'e');
   } else if (path.parentPath.isArrayPattern()) {
     return generateUid(path.scope, 'v');
   } else {

packages/webcrack/test/mangle.test.ts

@@ -89,3 +89,11 @@ test('parameters', () => {
   `).toMatchInlineSnapshot(`(p, p2, p3) => p + p2 + p3;`);
   expectJS('(x = 1) => x;').toMatchInlineSnapshot(`(p = 1) => p;`);
 });
+
+test('try-catch', () => {
+  expectJS(`
+    try {} catch (x) {}
+  `).toMatchInlineSnapshot(`
+    try {} catch (e) {}
+  `);
+});