Fixes #2746 (#2748)

* Fixes #2746

* add test

---------

Co-authored-by: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>

3 files changed, 20 insertions, 2 deletions

diff --git a/src/js_lexer_tables.zig b/src/js_lexer_tables.zig
index 7ca41ca28..dcf04573f 100644
--- a/src/js_lexer_tables.zig
+++ b/src/js_lexer_tables.zig
@@ -10,6 +10,9 @@ const ComptimeStringMap = @import("./comptime_string_map.zig").ComptimeStringMap
 
 pub const T = enum(u8) {
     t_end_of_file,
+    // close brace is here so that we can do comparisons against EOF or close brace in one branch
+    t_close_brace,
+
     t_syntax_error,
 
     // "#!/usr/bin/env node"
@@ -35,7 +38,6 @@ pub const T = enum(u8) {
     t_bar,
     t_bar_bar,
     t_caret,
-    t_close_brace,
     t_close_bracket,
     t_close_paren,
     t_colon,
@@ -151,6 +153,10 @@ pub const T = enum(u8) {
             },
         }
     }
+
+    pub fn isCloseBraceOrEOF(self: T) bool {
+        return @enumToInt(self) <= @enumToInt(T.t_close_brace);
+    }
 };
 
 pub const Keywords = ComptimeStringMap(T, .{
diff --git a/src/js_parser.zig b/src/js_parser.zig
index 72d75d160..abecc989c 100644
--- a/src/js_parser.zig
+++ b/src/js_parser.zig
@@ -12304,7 +12304,7 @@ fn NewParser_(
             const scopeIndex = p.pushScopeForParsePass(.class_body, body_loc) catch unreachable;
 
             var opts = PropertyOpts{ .is_class = true, .allow_ts_decorators = class_opts.allow_ts_decorators, .class_has_extends = extends != null };
-            while (p.lexer.token != T.t_close_brace) {
+            while (!p.lexer.token.isCloseBraceOrEOF()) {
                 if (p.lexer.token == .t_semicolon) {
                     try p.lexer.next();
                     continue;
diff --git a/test/bundler/transpiler.test.js b/test/bundler/transpiler.test.js
index 407aaf197..7af8f2d27 100644
--- a/test/bundler/transpiler.test.js
+++ b/test/bundler/transpiler.test.js
@@ -73,6 +73,18 @@ describe("Bun.Transpiler", () => {
     ts.expectPrinted_("console.log(`\r\n\r\n\r\n`)", "console.log(`\n\n\n`);\n");
   });
 
+  it("doesn't hang indefinitely #2746", () => {
+    // this test passes by not hanging
+    expect(() =>
+      transpiler.transformSync(`
+    class Test {
+      test() {
+      
+    }
+    `),
+    ).toThrow();
+  });
+
   describe("property access inlining", () => {
     it("bails out with spread", () => {
       ts.expectPrinted_("const a = [...b][0];", "const a = [...b][0]");