React project structure: from single file to modular monorepo

This comprehensive overview walks through organizing a React project, from a single file to a modular monorepo structure. The author details how to split code (files, technical folders, feature folders, domains, packages) and the impact of each approach on maintainability, dependency isolation, and scalability. Concrete examples illustrate how to evolve the architecture as the project grows, with clear rules to prevent cross-feature dependencies and encourage reuse.