The squaremap API module provides a clean, well-documented public interface for external plugins to interact with the map. It defines abstractions for world management, markers (Circle, Polygon, Icon, etc.), layer providers, icons, and player tracking. The design is decoupled from platform specifics, making it directly reusable by any Minecraft plugin that wants to add map features without depending on the full implementation. The API demonstrates solid contract-first design and is the primary integration point for third-party extensions.

FileUtil.atomicWrite provides a robust pattern for atomically writing files with retry logic, particularly handling Windows file-lock quirks. It takes a path and a consumer that writes to a temporary file, then atomically moves it into place. The implementation is self-contained (only uses standard Java IO) and could be extracted and reused in any Java project that needs safe file writing. It demonstrates attention to cross-platform reliability.

A thread-safe loading cache with FIFO eviction and capacity limits, designed for chunk snapshot caching during rendering. It supports concurrent access, recomputation, and asynchronous loading, and is implemented generically using `java.util.concurrent`. The class is independent of Minecraft and can be extracted for any use case requiring a bounded, least-recently-inserted cache with loading callbacks. It showcases solid concurrency engineering with lock-free reads and atomic eviction.

A color blending utility used to interpolate between block and biome colors for tile rendering. It implements standard color interpolation algorithms (including alpha blending and adjustments) in a self-contained way, with no dependencies on Minecraft classes. The utility is reusable in any Java graphics or image-processing context where color arithmetic is needed. It demonstrates clean, well-tested pure functions and is a good example of isolating algorithmic logic.