From 46e3f6df1f010ec1276eb6e0f961c51fca5affcb Mon Sep 17 00:00:00 2001
From: Armano <armano2@users.noreply.github.com>
Date: Tue, 8 Jan 2019 14:19:55 +0100
Subject: [PATCH] @babel/parser: include leading character into range of
 generic ArrowFunctionExpression (#9295)

---
 packages/babel-parser/src/plugins/typescript.js             | 5 +----
 .../typescript/arrow-function/generic-tsx/output.json       | 6 +++---
 .../fixtures/typescript/arrow-function/generic/output.json  | 6 +++---
 3 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/packages/babel-parser/src/plugins/typescript.js b/packages/babel-parser/src/plugins/typescript.js
index 07e57b9914..c25eaec0a3 100644
--- a/packages/babel-parser/src/plugins/typescript.js
+++ b/packages/babel-parser/src/plugins/typescript.js
@@ -2001,10 +2001,7 @@ export default (superClass: Class<Parser>): Class<Parser> =>
 
       // Correct TypeScript code should have at least 1 type parameter, but don't crash on bad code.
       if (typeParameters && typeParameters.params.length !== 0) {
-        this.resetStartLocationFromNode(
-          arrowExpression,
-          typeParameters.params[0],
-        );
+        this.resetStartLocationFromNode(arrowExpression, typeParameters);
       }
       arrowExpression.typeParameters = typeParameters;
       return arrowExpression;
diff --git a/packages/babel-parser/test/fixtures/typescript/arrow-function/generic-tsx/output.json b/packages/babel-parser/test/fixtures/typescript/arrow-function/generic-tsx/output.json
index ee5c663d37..58c3d96721 100644
--- a/packages/babel-parser/test/fixtures/typescript/arrow-function/generic-tsx/output.json
+++ b/packages/babel-parser/test/fixtures/typescript/arrow-function/generic-tsx/output.json
@@ -45,12 +45,12 @@
         },
         "expression": {
           "type": "ArrowFunctionExpression",
-          "start": 62,
+          "start": 61,
           "end": 78,
           "loc": {
             "start": {
               "line": 2,
-              "column": 1
+              "column": 0
             },
             "end": {
               "line": 2,
@@ -264,4 +264,4 @@
       }
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/packages/babel-parser/test/fixtures/typescript/arrow-function/generic/output.json b/packages/babel-parser/test/fixtures/typescript/arrow-function/generic/output.json
index 5b7f66c90e..1f99918b7a 100644
--- a/packages/babel-parser/test/fixtures/typescript/arrow-function/generic/output.json
+++ b/packages/babel-parser/test/fixtures/typescript/arrow-function/generic/output.json
@@ -45,12 +45,12 @@
         },
         "expression": {
           "type": "ArrowFunctionExpression",
-          "start": 1,
+          "start": 0,
           "end": 17,
           "loc": {
             "start": {
               "line": 1,
-              "column": 1
+              "column": 0
             },
             "end": {
               "line": 1,
@@ -228,4 +228,4 @@
     ],
     "directives": []
   }
-}
\ No newline at end of file
+}