Toolkit: Fix Cannot use "import statement outside" error in tests (#57071)

packages/grafana-toolkit/src/cli/tasks/toolkit.build.ts

@@ -30,6 +30,7 @@ const copyFiles = () => {
     'src/config/tsconfig.plugin.local.json',
     'src/config/eslint.plugin.js',
     'src/config/styles.mock.js',
+    'src/config/jest.babel.config.js',
     'src/config/jest.plugin.config.local.js',
     'src/config/matchMedia.js',
     'src/config/react-inlinesvg.tsx',

packages/grafana-toolkit/src/config/jest.babel.config.js

@@ -0,0 +1,2 @@
+// Transform es modules to prevent `SyntaxError: Cannot use import statement outside a module`
+module.exports = { presets: [['@babel/preset-env', { targets: { esmodules: false, node: 'current' } }]] };

packages/grafana-toolkit/src/config/jest.plugin.config.ts

@@ -83,7 +83,10 @@ export const jestConfig = (baseDir: string = process.cwd()) => {
       '<rootDir>/spec/**/*.{spec,test,jest}.{js,jsx,ts,tsx}',
     ],
     transform: {
-      '^.+\\.jsx?$': require.resolve('babel-jest'),
+      '^.+\\.(js|jsx|mjs)$': [
+        require.resolve('babel-jest'),
+        { configFile: path.resolve(__dirname, './jest.babel.config.js') },
+      ],
       '^.+\\.tsx?$': require.resolve('ts-jest'),
     },
     transformIgnorePatterns: [