This document, which will apply to both mobile and extension (and any repository, future or present), must be ratified by members of all product teams. It should detail our best practices when using TypeScript, including configuration, code examples, etc. In addition we should include a full style guide, using our eslint configuration as the base. The eslint configuration for typescript codifies our style guide and pulling in the rules and writing examples in the style guide will help to prepare the extension for typescript refactor.