From 3f72f1d63746b3590ae2c4be044afb37c270641c Mon Sep 17 00:00:00 2001
From: Justin Ridgewell <justin@ridgewell.name>
Date: Fri, 6 Apr 2018 18:13:10 +0100
Subject: [PATCH] Add option to overwrite failing output fixtures (#7679)

---
 .../src/index.js                                  | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/packages/babel-helper-transform-fixture-test-runner/src/index.js b/packages/babel-helper-transform-fixture-test-runner/src/index.js
index 71a3f9e5e5..bf1f93f137 100644
--- a/packages/babel-helper-transform-fixture-test-runner/src/index.js
+++ b/packages/babel-helper-transform-fixture-test-runner/src/index.js
@@ -407,10 +407,17 @@ function run(task) {
       }
     } else {
       actualCode = result.code.trim();
-      expect(actualCode).toEqualFile({
-        filename: expected.loc,
-        code: expectCode,
-      });
+      try {
+        expect(actualCode).toEqualFile({
+          filename: expected.loc,
+          code: expectCode,
+        });
+      } catch (e) {
+        if (!process.env.OVERWRITE) throw e;
+
+        console.log(`Updated test file: ${expected.loc}`);
+        fs.writeFileSync(expected.loc, `${result.code}\n`);
+      }
 
       if (actualCode) {
         expect(expected.loc).toMatch(