Istanbul‑lib‑processinfo is a small utility library that reads, writes, and manages the `processinfo` directory that NYC (the JavaScript code‑coverage tool) uses to store per‑process coverage metadata. It provides `ProcessInfo` objects for individual processes and a `ProcessDB` API for building the process tree, spawning or expunging named child processes, and generating merged coverage maps—useful for NYC itself or any tool that needs to consume NYC’s process‑level coverage data.