gridfinity-calc/memory-bank/systemPatterns.md

System Patterns

Tech Stack

• Build Tool: Vite
• Language: TypeScript
• Styling: Tailwind CSS
• Testing: Vitest

Design Patterns

• Modular Logic: Calculation logic is isolated in a pure TypeScript module (src/calculator.ts) for easy testing.
• Reactive UI (Vanilla): Use DOM event listeners and a central render() or update() function to sync state to the UI.
• Unit Normalization: All internal calculations should be performed in millimeters. Inputs in inches are converted immediately upon ingestion.

Directory Structure

• src/: Source code.
  • calculator.ts: Core business logic.
  • main.ts: Entry point and DOM manipulation.
  • style.css: Tailwind entry point.
• docs/: Permanent documentation (PRD, Architecture).
• memory-bank/: AI operational context.
• tests/: Unit tests.

Calculation Constants (Defaults)

• Grid Width/Depth: 42mm
• Grid Height Unit: 7mm
• Base Thickness: 4.8mm (typical baseplate height above surface)
• Bin Lip/Bottom: 0.7mm (typical clearance/thickness to account for in vertical units)
  • Note: These defaults will be refined during implementation based on official specs.