TypeScript development
Build type-safe, scalable, and maintainableJavaScript applications with TypeScript
We write front ends and Node.js services in TypeScript, move existing JavaScript over in stages, and plan upgrades to the new native compiler. TypeScript catches a class of mistakes before release. It doesn't check data at runtime, so we design for that too.
What TypeScript work covers
From new code to a large JavaScript codebase that needs types added safely.
New applications
Strict mode from the first commit, with types shared between the API and the front end so a changed field shows up as a compile error, not a customer complaint.
Migrating JavaScript in stages
Files are converted a folder at a time with allowJs on, starting with the shared modules most of the code imports, so the app keeps shipping throughout.
Tightening a loose codebase
Removing any, turning on strict checks one at a time and fixing what they reveal, in reviewable pull requests rather than one huge change.
Validating data at the edges
Types disappear when code compiles, so API responses, form input and webhooks are checked at runtime with a schema, and the static types are generated from that schema.
TypeScript versions, as of October 2026
This year changed more than most, and the right version depends on your tools.
TypeScript 7 is the native compiler
Released on 8 July 2026 as a port to Go. Microsoft reports full builds about 8 to 12 times faster, with VS Code falling from 125.7s to 10.6s. Expect different numbers on your own code.
7.0 ships without a compiler API
A new, different API is planned for 7.1, which reached beta on 20 October 2026. Until then, typescript-eslint and similar tools use the @typescript/typescript6 compatibility package.
Your framework may hold you on 6
Microsoft advises Vue, MDX, Astro, Svelte and Angular template users to stay on 6.0 for editor support, and Angular 22 itself requires TypeScript 6.0. Check before you upgrade.
What an upgrade to 6 and 7 changes
Most of the work is in configuration, and it should happen on 6.0 first.
New defaults
TypeScript 6.0 turned strict on by default, and rootDir now defaults to ./. A project that never set these can suddenly show many errors.
Removed options
Options deprecated in 6.0 become hard errors in 7.0, including target es5, moduleResolution node, baseUrl and downlevelIteration. Old tsconfig files commonly use at least one.
Running both side by side
7.0 can be installed next to 6.0, so CI can use the fast compiler for checks while lint and editor tooling stay on 6.0 until their APIs catch up.
When to wait
If your build depends on custom transformers or tools that call the compiler API, wait for 7.1 to settle. The speed gain is real, but it isn't worth breaking your lint and build.
How a TypeScript migration runs
The aim is that nothing stops shipping while the types go in.
Measure the starting point
We run the compiler over the code as it stands, count errors by folder and look at which dependencies lack types.
Agree the order
Shared modules go first because every later file benefits, and we agree which strict flags come on at each stage.
Convert in small pull requests
Each one is limited to a folder and changes no behaviour, which keeps review possible and problems easy to revert.
Lock it in CI
Type checks run on every pull request, and the ratchet only moves one way, so the new standard stays in place after we leave.
Working with us on TypeScript
Migrations can run beside your own team's feature work.
A migration is hard to price before the first measurement, so we start by running that and then quote stages. Because the work can run for a while next to feature development, it often suits developers added to your team, at rates from $20/h in USD, invoiced in USD, GBP, EUR or INR.
We are an engineering team in India with 3–5 hours of overlap with the UK and Europe; US calls by appointment. Migration pull requests can be reviewed by your engineers during their working day. TypeScript runs through our Next.js and Node.js work, and this website is itself written in TypeScript.
Why this page has no client examples
Most of our work is delivered under NDA, so many projects cannot be named.
So we show you our method for TypeScript work here. If you want to judge the code quality directly, a short paid review of part of your repository tells you more than a logo would.
Questions about TypeScript
Asked by teams weighing up a migration.
Does TypeScript make our app faster?
Do we have to convert everything at once?
Should we move to TypeScript 7 now?
Is TypeScript worth it on a small project?
Send us your tsconfig and a rough size
Tell us the framework, the number of files and which TypeScript version you run. We will tell you what a move to strict types or version 7 would involve.
We reply within one business day (IST).