The tool of focus in this chapter is Flow, a static type checker for JavaScript applications. The scope of Flow and what you can do with it is enormous, so I'll be introducing Flow in the context of a tool that's used to make React components better. In this chapter, you'll learn the following:

• The problems that are solved by introducing type-safety into your React application
• Enabling Flow in your React projects
• Using Flow to validate your React components
• Other ways to enhance React development using type-safety