From 09d8afca684635b5ac604bc1794240484a70ce91 Mon Sep 17 00:00:00 2001
From: Brad Zacher <brad.zacher@gmail.com>
Date: Wed, 18 Mar 2020 12:06:32 -0700
Subject: [PATCH] fix(typescript-estree): export * regression from 133f622f
 (#1751)

---
 packages/typescript-estree/src/convert.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/packages/typescript-estree/src/convert.ts b/packages/typescript-estree/src/convert.ts
index 74c701b7fc4..c622e11c14f 100644
--- a/packages/typescript-estree/src/convert.ts
+++ b/packages/typescript-estree/src/convert.ts
@@ -1602,7 +1602,12 @@ export class Converter {
             source: this.convertChild(node.moduleSpecifier),
             exportKind: node.isTypeOnly ? 'type' : 'value',
             exported:
-              node.exportClause?.kind === SyntaxKind.NamespaceExport
+              // note - for compat with 3.7.x, where node.exportClause is always undefined and
+              //        SyntaxKind.NamespaceExport does not exist yet (i.e. is undefined), this
+              //        cannot be shortened to an optional chain, or else you end up with
+              //        undefined === undefined, and the true path will hard error at runtime
+              node.exportClause &&
+              node.exportClause.kind === SyntaxKind.NamespaceExport
                 ? this.convertChild(node.exportClause.name)
                 : null,
           });