module-decomposition

To refactor a large TypeScript module without breaking behavior, use a no-loss decomposition strategy that preserves exported semantics. This involves splitting entangled code into mutually exclusive submodules while enforcing a one-way dependency topology to prevent cycles.

Module decomposition in frontend runtime architecture planning is the process of breaking down oversized files or directories into mutually exclusive submodules. It enforces explicit non-loss invariants and dependency topology to reduce coupling without changing external semantics.

To prevent dependency cycles when splitting large React components, enforce a one-way import topology during module decomposition. Treat cycles as boundary-design failures and require explicit dependency direction mapping before implementing the refactor.

No-loss pruning is designed for files or directories that exceed a LOC threshold, typically around 1000 LOC. While it can technically apply to smaller files, the overhead of generating a Decomposition Brief is best suited for oversized, entangled modules.

The best way to plan an incremental TypeScript refactoring migration is to generate a standardized Decomposition Brief containing mutually exclusive submodule lists, naming conventions, dependency topology, and step-by-step validation strategies suitable for agent-driven workflows.

Directory drift happens during subsystem-style module decomposition when files are moved without a strict organizational shape. Enforcing a two-shape decomposition model, using flat tiling for single subjects and directory-based organization for subsystems, prevents this drift.