Possibly checking the babel version in the project (cwd) and using `babel-register` or `@babel/register` depending on the version. Relevant parts of the code: https://github.com/diegohaz/singel/blob/86d9fe65e0df14fab8bab144dfa0a88dae7bb371/src/cli.js#L29 https://github.com/diegohaz/singel/blob/86d9fe65e0df14fab8bab144dfa0a88dae7bb371/package.json#L46
