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In this model, everything related to a specific domain—like "Authentication" or "Billing"—lives in one place. This reduces the time spent hunting through the file tree and makes it easier to delete or move entire features. A typical structure looks like this: src/components: Shared UI elements like Buttons or Inputs. : In this model, everything related to a
Component State: Use useState for UI-only logic (is a modal open?). : In this model
Unit Tests: Use Vitest or Jest for pure utility functions and isolated logic. : In this model, everything related to a