From 36c699eac3b921314515d144b4f3b038b51b913a Mon Sep 17 00:00:00 2001
From: Jorge Henriquez <contact@jorgehenriquez.dev>
Date: Mon, 15 Jun 2020 19:28:03 -0700
Subject: [PATCH] Add: better parser error when using jsx

Address #11499
---
 packages/babel-parser/src/parser/expression.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/packages/babel-parser/src/parser/expression.js b/packages/babel-parser/src/parser/expression.js
index 0ef5ca4270ef..e63401b4747b 100644
--- a/packages/babel-parser/src/parser/expression.js
+++ b/packages/babel-parser/src/parser/expression.js
@@ -1170,6 +1170,12 @@ export default class ExpressionParser extends LValParser {
         }
       }
       // fall through
+      case tt.relational: {
+        if (this.state.value === "<") {
+          throw this.expectOnePlugin(["jsx", "flow", "typescript"]);
+        }
+      }
+      // fall through
       default:
         throw this.unexpected();
     }