test(jest): add support for vscode mappings (#49)

Author: char0n

packages/react-scripts/config/jest/babelTransform.js

@@ -32,6 +32,7 @@ module.exports = babelJest.createTransformer({
       },
     ],
   ],
+  plugins: ['@babel/plugin-transform-class-static-block'],
   babelrc: false,
   configFile: false,
 });

packages/react-scripts/scripts/utils/createJestConfig.js

@@ -56,6 +56,10 @@ module.exports = (resolve, rootDir, isEjecting) => {
     moduleNameMapper: {
       '^react-native$': 'react-native-web',
       '^.+\\.module\\.(css|sass|scss)$': 'identity-obj-proxy',
+      'vscode/vscode/vs/base/common/strings':
+        'vscode/vscode/src/vs/base/common/strings.js',
+      'vscode/vscode/vs/editor/common/diff/defaultLinesDiffComputer/defaultLinesDiffComputer':
+        'vscode/vscode/src/vs/editor/common/diff/defaultLinesDiffComputer/defaultLinesDiffComputer.js',
       ...(modules.jestAliases || {}),
     },
     moduleFileExtensions: [...paths.moduleFileExtensions, 'node'].filter(