Why TypeScript over plain JavaScript?

TypeScript catches whole categories of bugs at compile time, makes large codebases navigable, and gives editors real autocomplete. For any production app expected to live more than a year, it pays for itself within weeks.

Can you add TypeScript to an existing JS codebase?

Yes. WH Studio incrementally adopts TypeScript — converting modules file-by-file with allowJs, then tightening tsconfig strictness as confidence grows. Zero downtime, no big-bang rewrite.

What is your TypeScript stack?

React + Next.js on the frontend, Node.js (Express, Fastify, NestJS) on the backend, Zod or TypeBox for runtime validation, Drizzle or Prisma for typed database access, and tRPC where end-to-end typed RPC fits.

Do you write your own types or rely on DefinitelyTyped?

Both. We use community types where available and write project-specific types for domain models, API contracts, and generated client SDKs.

How strict should tsconfig be?

For new projects: strict: true, noUncheckedIndexedAccess, noImplicitOverride, and exactOptionalPropertyTypes. For migrations: ratchet up incrementally as the codebase converges.

TypeScript Development · From $8,000

TypeScript that helps the team, not just the compiler.

End-to-end typed apps, strict-mode migrations, and boundary-driven type design — with Zod validation, discriminated unions for state, and inferred types inside modules so the compiler earns its keep.

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TypeScript 5+ · strict mode · Zod · tRPC · Drizzle · Prisma

Capabilities

TypeScript development services.

Full-Stack TypeScript

Shared types between frontend and backend, monorepo-ready.
tRPC for end-to-end typed RPC where the shape fits.

Strict-Mode Architecture

`strict: true`, `noUncheckedIndexedAccess`, `exactOptionalPropertyTypes`.
Discriminated unions, branded types, type guards over assertions.

Migration & Modernization

JS → TS conversion file-by-file with allowJs, no big-bang rewrites.
Ratchet strictness as coverage grows — zero downtime.

Engagements

Packaged TypeScript engagements.

Full-Stack TypeScript Apps

React + Node monorepos with shared types, tRPC or REST + Zod, and generated client SDKs.

Starting at

From $18,000

Enterprise Architecture

Strict-mode configuration, advanced type patterns, generic utilities, and comprehensive error-handling contracts.

Starting at

From $22,000

TypeScript Migration

Gradual JS → TS conversion, type-definition creation, and strictness ratcheting without freezing feature work.

Starting at

From $8,000

Type-Safe API Layer

REST or GraphQL with Zod schema validation, OpenAPI generation, and GraphQL Code Generator for typed clients.

Starting at

From $12,000

Stack

The TypeScript stack we ship on.

Frontend
React + TypeScript, Next.js with strict mode, Vue 3 or Angular where the org demands it.
Backend
Node.js with Fastify or NestJS, tRPC for internal RPC, Zod schemas at every network boundary.
Data Layer
Drizzle or Prisma for typed database access, Zod for runtime validation, generated SDKs for client apps.
Tooling
tsx / ts-node, ESLint + typescript-eslint strict presets, project references for monorepo build speed.

Field notes

TypeScript that helps the team, not just the compiler.

TypeScript is now table stakes — the interesting question is how to use it well. Strict mode on day one, type-driven design at module boundaries, and inferred types inside modules. The teams that get this right ship faster, not slower.

Strict mode, no exceptions

strict: true in tsconfig.json on every new project, including noUncheckedIndexedAccess and exactOptionalPropertyTypes. The cost is two days of upfront work; the benefit is an entire category of runtime bugs you simply will never write.

Type-driven design at module boundaries

Every exported function, every API contract, every database row gets a precise type. Discriminated unions for state machines, branded types for IDs, Zod schemas for runtime validation at boundaries. Detail in our TypeScript + React best practices guide.

Patterns we've stopped using

React.FC, TypeScript enums, "temporary" any, and type assertions over type guards. Each of these has aged poorly enough that we explicitly remove them on every legacy refactor. The replacements are simpler and safer.

FAQs

TypeScript Development FAQs

Frequently Asked Questions

Ready to build?

Build type-safe applications.

Let's discuss your TypeScript project and create a robust, type-safe application that scales — with strict mode, boundary types, and Zod validation from day one.

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