From 4469700bb60ffd62caf112e47bcfa51afdd40e47 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Markb=C3=A5ge?= <sema@fb.com>
Date: Fri, 28 Feb 2020 13:09:02 -0800
Subject: [PATCH] Change ReactVersion from CJS to ES module (#18181)

---
 packages/shared/ReactVersion.js                          | 4 +---
 .../publish-commands/update-stable-version-numbers.js    | 2 +-
 scripts/release/utils.js                                 | 5 +----
 scripts/tasks/version-check.js                           | 9 +++++++--
 4 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/packages/shared/ReactVersion.js b/packages/shared/ReactVersion.js
index 25252441e8d9b..46c1d6bd7da96 100644
--- a/packages/shared/ReactVersion.js
+++ b/packages/shared/ReactVersion.js
@@ -5,7 +5,5 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-'use strict';
-
 // TODO: this is special because it gets imported during build.
-module.exports = '16.13.0';
+export default '16.13.0';
diff --git a/scripts/release/publish-commands/update-stable-version-numbers.js b/scripts/release/publish-commands/update-stable-version-numbers.js
index 0a56d8e39c66b..76a6d6f1622ca 100644
--- a/scripts/release/publish-commands/update-stable-version-numbers.js
+++ b/scripts/release/publish-commands/update-stable-version-numbers.js
@@ -44,7 +44,7 @@ const run = async ({cwd, packages, skipPackages, tags}) => {
     const sourceReactVersion = readFileSync(
       sourceReactVersionPath,
       'utf8'
-    ).replace(/module\.exports = '[^']+';/, `module.exports = '${version}';`);
+    ).replace(/export default '[^']+';/, `export default '${version}';`);
     writeFileSync(sourceReactVersionPath, sourceReactVersion);
   }
 };
diff --git a/scripts/release/utils.js b/scripts/release/utils.js
index 60785482174a9..cb0873d1c77f0 100644
--- a/scripts/release/utils.js
+++ b/scripts/release/utils.js
@@ -209,10 +209,7 @@ const updateVersionsForNext = async (cwd, reactVersion, version) => {
   const sourceReactVersion = readFileSync(
     sourceReactVersionPath,
     'utf8'
-  ).replace(
-    /module\.exports = '[^']+';/,
-    `module.exports = '${reactVersion}';`
-  );
+  ).replace(/export default '[^']+';/, `export default '${reactVersion}';`);
   writeFileSync(sourceReactVersionPath, sourceReactVersion);
 
   // Update the root package.json.
diff --git a/scripts/tasks/version-check.js b/scripts/tasks/version-check.js
index 81de48e28e92f..57dcfdfba6388 100644
--- a/scripts/tasks/version-check.js
+++ b/scripts/tasks/version-check.js
@@ -7,7 +7,12 @@
 
 'use strict';
 
-const reactVersion = require('../../package.json').version;
+const fs = require('fs');
+const ReactVersionSrc = fs.readFileSync(
+  require.resolve('../../packages/shared/ReactVersion')
+);
+const reactVersion = /export default '([^']+)';/.exec(ReactVersionSrc)[1];
+
 const versions = {
   'packages/react/package.json': require('../../packages/react/package.json')
     .version,
@@ -15,7 +20,7 @@ const versions = {
     .version,
   'packages/react-test-renderer/package.json': require('../../packages/react-test-renderer/package.json')
     .version,
-  'packages/shared/ReactVersion.js': require('../../packages/shared/ReactVersion'),
+  'packages/shared/ReactVersion.js': reactVersion,
 };
 
 let allVersionsMatch = true;