- .eslintrc.json to configure ESLint

- .prettierignore because it tries to format package-lock.json

- prettier.config.json

- npm/yarn and package.json + node_modules

- .nvmrc to pin your node version

- storybook

- renovate to update dependencies

- .editorconfig to ignore node_modules

- mocha for testing and .mochaarc.js

- stylelint and .stylelintrc.json + .stylelintignore

And maybe throw in Jest, tsconfig.json, a gulpfile, and some other stuff.