Do not rewrite extensions in test env

javascript/babel.config.cjs

@@ -7,7 +7,7 @@
  * @format
  */
 
-module.exports = {
+module.exports = api => ({
   presets: [
     [
       '@babel/preset-env',
@@ -23,8 +23,8 @@ module.exports = {
     [
       '@babel/preset-typescript',
       {
-        rewriteImportExtensions: true,
+        rewriteImportExtensions: !api.env('test'),
       },
     ],
   ],
-};
+});

javascript/jest.config.js

@@ -7,10 +7,8 @@
  * @format
  */
 
-const config = {
+export default {
   setupFiles: ['./jest.setup.js'],
   testRegex: '/tests/.*\\.test\\.ts$',
   extensionsToTreatAsEsm: ['.ts'],
 };
-
-export default config;