Under the Hood: Building and open-sourcing flint

What this post added

This post introduces 'flint', Meta's custom C++ lint program, and details its development and open-sourcing. It highlights the challenges of C++ parsing, the decision to build a custom linter due to performance and feature limitations of existing tools, and the benefits of writing flint in the D language (faster builds, execution, and easier contribution). The post also enumerates 19 specific lint checks implemented in flint, demonstrating a focus on improving code quality and preventing common programming errors.