From 50254841397427add5fb278289fe6f7a472adf79 Mon Sep 17 00:00:00 2001
From: Craig Mulligan <hobochildster@gmail.com>
Date: Sun, 20 May 2018 20:27:31 +0100
Subject: [PATCH] `.mjs` should not resolve before .js files (#4085) (#4318)

Support for .mjs files added in #3239 did not account for npm libraries which ship native mjs files alongside js files. This accounts for this by ensuring .js files resolve before their accompanying .mjs file. Note that this is not an ideal end state since selecting a .mjs over a .js extension should be the result of whether `import` was used instead of `require()` in a node environment with native ESM support (currently via `--experimental-modules`). Instead, this change just *always* selects a .js extension before the .mjs extension if it exists.

This unbreaks support for using GraphQL (relay, apollo, etc) within create-react-app projects.
---
 scripts/utils/createJestConfig.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/utils/createJestConfig.js b/scripts/utils/createJestConfig.js
index aa84d7637ff..e884518d73a 100644
--- a/scripts/utils/createJestConfig.js
+++ b/scripts/utils/createJestConfig.js
@@ -53,12 +53,12 @@ module.exports = (resolve, rootDir, srcRoots) => {
     },
     moduleFileExtensions: [
       'web.js',
-      'mjs',
       'js',
       'json',
       'web.jsx',
       'jsx',
       'node',
+      'mjs',
     ],
   };
   if (rootDir) {