[TypeScript transpiler] Fix bug with `export default class implements`

2 files changed, 30 insertions, 5 deletions

diff --git a/src/js_parser.zig b/src/js_parser.zig
index 86dabc005..fbfaa3a43 100644
--- a/src/js_parser.zig
+++ b/src/js_parser.zig
@@ -6782,7 +6782,7 @@ fn NewParser_(
 
         fn parseClassStmt(p: *P, loc: logger.Loc, opts: *ParseStatementOptions) !Stmt {
             var name: ?js_ast.LocRef = null;
-            var class_keyword = p.lexer.range();
+            const class_keyword = p.lexer.range();
             if (p.lexer.token == .t_class) {
                 //marksyntaxfeature
                 try p.lexer.next();
@@ -6790,11 +6790,11 @@ fn NewParser_(
                 try p.lexer.expected(.t_class);
             }
 
-            var is_identifier = p.lexer.token == .t_identifier;
+            const is_identifier = p.lexer.token == .t_identifier;
 
-            if (!opts.is_name_optional or (is_identifier and (!is_typescript_enabled or !strings.eqlComptime(p.lexer.identifier, "interface")))) {
-                var name_loc = p.lexer.loc();
-                var name_text = p.lexer.identifier;
+            if (!opts.is_name_optional or (is_identifier and (!is_typescript_enabled or !strings.eqlComptime(p.lexer.identifier, "implements")))) {
+                const name_loc = p.lexer.loc();
+                const name_text = p.lexer.identifier;
                 try p.lexer.expect(.t_identifier);
 
                 // We must return here
diff --git a/test/bun.js/transpiler.test.js b/test/bun.js/transpiler.test.js
index 94c3d52d2..05607091a 100644
--- a/test/bun.js/transpiler.test.js
+++ b/test/bun.js/transpiler.test.js
@@ -106,6 +106,31 @@ describe("Bun.Transpiler", () => {
       ts.expectPrinted_("export = {foo: 123}", "module.exports = { foo: 123 }");
     });
 
+    it("export default class implements TypeScript regression", () => {
+      expect(
+        transpiler
+          .transformSync(
+            `
+      export default class implements ITest {
+        async* runTest(path: string): AsyncGenerator<number> {
+          yield Math.random();
+        }
+      }
+      `,
+            "ts",
+          )
+          .trim(),
+      ).toBe(
+        `
+export default class {
+  async* runTest(path) {
+    yield Math.random();
+  }
+}
+      `.trim(),
+      );
+    });
+
     it("satisfies", () => {
       ts.expectPrinted_(
         "const t1 = { a: 1 } satisfies I1;",