Reproduce Jest Type Error

.babelrc

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+{
+	"presets":[
+		"@babel/react"
+	]
+}

config/jest/cssTransform.js

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+// This is a custom Jest transformer turning style imports into empty objects.
+// http://facebook.github.io/jest/docs/en/webpack.html
+
+module.exports = {
+	process() {
+	  return 'module.exports = {};';
+	},
+	getCacheKey() {
+	  // The output is always the same.
+	  return 'cssTransform';
+	},
+  };

config/jest/fileTransform.js

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+const path = require('path');
+
+ // This is a custom Jest transformer turning file imports into filenames.
+// http://facebook.github.io/jest/docs/en/webpack.html
+
+module.exports = {
+  process(src, filename) {
+    return `module.exports = ${JSON.stringify(path.basename(filename))};`;
+  },
+};

config/jest/jestPreprocess.js

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+const babelOptions = {
+	presets: [
+	  ['@babel/preset-env', { targets: { node: 'current' } }],
+	],
+	plugins: [
+	  'transform-custom-element-classes',
+	  '@babel/plugin-proposal-class-properties',
+	  // '@babel/plugin-transform-regenerator'
+	]
+  };
+
+  module.exports = require('babel-jest').createTransformer(babelOptions);

config/jest/setupTests.js

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+// polyfills etc
+// mutationobserver
+/* eslint-disable import/no-extraneous-dependencies */
+import 'mutationobserver-shim';
+import '@axa-ch/patterns-library-polyfill';
+
+import Enzyme from 'enzyme';
+import Adapter from 'enzyme-adapter-react-16';
+
+Enzyme.configure({ adapter: new Adapter() });

jest.config.js

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+module.exports = {
+	collectCoverageFrom: [
+	  'src/**/*.js',
+	],
+	setupFilesAfterEnv: [
+	  `${__dirname}/config/jest/setupTests.js`,
+	],
+	testMatch: [
+	  `${__dirname}/src/**/*.test.{js,jsx,mjs}`,
+	],
+	transform: {
+	  '^.+\\.css$': `${__dirname}/config/jest/cssTransform.js`,
+	  '^(?!.*\\.(js|jsx|mjs|css|json)$)': `${__dirname}/config/jest/fileTransform.js`,
+	  '^.+\\.(js|jsx)$': `${__dirname}/config/jest/jestPreprocess.js`,
+	},
+	transformIgnorePatterns: [
+	  '/node_modules\\/(?![lit\\-element|lit\\-html])/',
+	],
+	moduleFileExtensions: [
+	  'js',
+	  'jsx',
+	  'json',
+	],
+  };