Toposource is a tiny TypeScript library that takes a list of directed edges, builds the graph and returns useful metadata for parallel processing: maps of next/previous nodes, identified source nodes, a topological traversal queue, and a breakdown of disconnected sub‑graphs. It’s aimed at developers who need to schedule or batch tasks that have dependency relationships (e.g., build pipelines, job runners) and want a simple, fast way to analyze the graph without pulling in a full‑blown graph library.