TypeScript Foundation
The cleanest TypeScript Next.js base you can buy. Zero compromises.
Next.js 14TypeScriptTailwindZod
$197one-time
100/100 LHPreview →
Deloryen Studio
Next.js TypeScript Templates
TypeScript coverage is not a binary — it exists on a spectrum from nominal type annotations that satisfy the compiler to strict, comprehensive type safety that prevents entire categories of runtime errors. Deloryen Next.js TypeScript templates are at the disciplined end of that spectrum: strict mode enabled, 100% coverage including API routes and utility functions, environment variable validation with @t3-oss/env-nextjs, and typed database queries where applicable. For agencies delivering projects to clients with development teams, this is the difference between a codebase that a new developer can onboard to in two hours and one that requires archaeological interpretation.
- 100% TypeScript coverage — zero .jsx files
- Strict mode enabled
- Environment variable validation with @t3-oss/env-nextjs
- Typed API routes with Zod validation
- Component prop interfaces documented
- Database schema types (Prisma or Drizzle)
- Path aliases configured in tsconfig.json
- Type-safe fetch utilities with generics
Available Templates
TypeScript SaaS
Typed SaaS template with Stripe, auth, database, and strict TypeScript.
Next.js 14TypeScriptTailwindPrismaStripe
$347one-time
97/100 LHPreview →
TypeScript Agency
Agency template with complete TypeScript architecture.
Next.js 14TypeScriptTailwind
$197one-time
98/100 LHPreview →
What Every Template Includes
Production Standards. Not Marketing Claims.
| Specification | Other Marketplaces | Deloryen Studio |
|---|---|---|
| Lighthouse Performance | 62–74 | 95–100 |
| Next.js Architecture | Pages Router common | App Router only |
| TypeScript Coverage | Partial or absent | 100% strict mode |
| CSS System | Bootstrap (200kb+) | Tailwind (10kb purged) |
| Structured Data | Rarely included | Every page |
| GEO Optimization | None | Built-in |
| Performance Guarantee | None | Documented + testable |
| License | Complex, tiered | Clear commercial terms |
FAQ
Frequently Asked Questions
What TypeScript strict settings are enabled?
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Templates use strict:true in tsconfig.json, which enables strictNullChecks, noImplicitAny, strictFunctionTypes, strictPropertyInitialization, and all other strict mode checks. These settings prevent the most common categories of runtime errors.
How are environment variables typed?
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@t3-oss/env-nextjs validates and types all environment variables at build time. Missing or incorrectly typed environment variables cause a build error rather than a silent runtime failure.
Are API route request and response types defined?
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Yes. Every API route has typed request parameters, body schemas (Zod), and response types. This prevents type mismatches between the client and server at compile time.
Does TypeScript coverage affect Lighthouse performance?
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TypeScript is compiled to JavaScript at build time and has no runtime impact on Lighthouse scores. The type safety benefits are entirely at development time.
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