How long does a JavaScript-to-TypeScript migration take?

It depends on codebase size and how much untyped code is already in use, but we plan migrations to run alongside normal feature work rather than freezing development, converting files in dependency order.

Do you enforce strict mode from day one?

On new projects, yes. On migrations, we usually start looser and tighten settings incrementally as the codebase catches up, so the team isn't blocked by hundreds of errors at once.

TypeScript Development

We write TypeScript in strict mode across the entire stack — frontend components, server logic, and shared types — so type errors surface at build time, not in production. For teams with an existing JavaScript codebase, we handle incremental migration without stopping feature work.

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Common problems

`any` types spread through a codebase until type-checking stops catching real bugs.
Frontend and backend define the same data shapes twice, and they drift out of sync.
Legacy JavaScript codebases are too large to convert to TypeScript in one pass.
Type errors get suppressed with `@ts-ignore` instead of fixed.

What you get

Strict-mode TypeScript catches an entire class of bugs before code ships.
Shared types between client and server eliminate a common source of runtime errors.
Incremental migration plans convert files in dependency order without breaking builds.
Editor autocomplete and refactoring tools become dramatically more reliable.

Capabilities

What our typescript development work covers

Strict-mode setup

Configuring `strict: true` and the surrounding lint rules so type safety is enforced, not optional.

Shared type architecture

Types and Zod schemas shared between client, server, and API boundaries.

JS-to-TS migration

Incremental, file-by-file conversion plans for existing JavaScript codebases.

Generic and utility types

Reusable generic types and utilities that reduce duplication across a large codebase.

Technology

Stack we build with

TypeScriptZodESLint + typescript-eslintNext.js / Node.js

Project types

JavaScript-to-TypeScript migrations
New strict-mode TypeScript builds
Shared type layer between frontend and backend
Monorepo type architecture

Deliverables

Strict-mode TypeScript configuration
Migration plan and converted codebase
Shared type and schema layer for API boundaries
CI type-checking gate

Related services

Next.js DevelopmentServer-rendered, SEO-friendly apps built on the App Router.

React DevelopmentComponent-driven interfaces with modern React patterns.

SaaS DevelopmentMulti-tenant products from architecture to billing.

FAQ

Frequently asked questions

Ready to talk about typescript development?

Tell us about your goals, timeline, and budget. We'll reply with next steps.

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