$ npm test
This will check that the files are formatted correctly with prettier, that
you have not broken any of the non-format-related "standard" eslint rules,
and that all the tests in the test/
directory pass.
To fix code formatting issues:
$ eslint --fix
If you would like to format your code automatically when you save a file, there are many ways to set that up. See the "Editor Integration" of the Prettier README for details.
$ npm run cover
This will run the tests and generate a coverage report on the command line as well as open a web browser with an HTML code coverage report.