Problem description

In a CRA project, I was always getting the error unexpected token issue when rendering a component with React-testing-library. The component was loading an external dependency which didn't get transpiled correctly. As can be seen in the package.json and described here, the fix was to use the --transformIgnorePattern as a CLI option. Hardcoding the option into the jest config of the package.json or inside an external jest.config.js file, didn't work for me.