Direct Answer: TypeScript development in 2026 emphasizes strict type safety combined with development efficiency. Modern best practices include utilizing the satisfies operator, template literal types, and const assertions. Structured setups using Monorepos, absolute path aliases, and fast tools like Vitest and MSW are highly recommended for robust applications.
Complete Guide to Selling on Amazon FBA Japan
Amazon FBA (Fulfillment by Amazon) lets you sell on Amazon Japan even while based overseas.
How FBA Works
Pre-ship products to Amazon warehouses
Amazon automatically fulfills orders
Customer service handled by Amazon
Prime badge increases search visibility
What You Need
- JAN/UPC codes: Required for product identification
- ASIN registration: Listing in Amazon's product catalog
- FNSKU labels: FBA-specific labels (DONOMI can handle this)
- Product inspection: Ensure compliance with Japanese quality standards
DONOMI's FBA Services
DONOMI provides comprehensive FBA fulfillment for overseas sellers:
- Receiving: Accept and inspect products arriving from overseas
- Labeling: Apply FNSKU labels
- Packaging: Pack according to Amazon specifications
- FBA delivery: Direct delivery to Amazon warehouses
- Inventory monitoring: FBA stock level surveillance and alerts
Cost Structure
| Cost Item | Overview |
|---|---|
| FBA storage fee | Product size × storage days |
| FBA shipping fee | Fixed rate by product size |
| Referral fee | 8-15% by category |
| DONOMI service fee | Receiving to delivery |
FBA's biggest advantage is entering the Japanese market with minimal upfront investment.
Q: What should I use instead of enums?
A: Object literals with as const (const assertions) are preferred over traditional enums.
Q: Which test runner is recommended?
A: Vitest is currently the mainstream choice due to its speed and full compatibility with Jest.
Q: What is the best tool for API mocking?
A: MSW (Mock Service Worker) is the de facto standard for highly effective API mocking.