Hire a TypeScript developer: bugs caught at build time, not by your users

No. Types go in at the boundaries first, then module by module as the code gets touched. Browser code without a framework, Node.js scripts and legacy ES5 are on the JavaScript page, with a live event‑loop demo.

Hourly: $45 base, $36 for simple work, $54 for complex, net. A dedicated B2B contract is $7,500 a month, three months minimum. Pricing has the EUR and PLN rates too.

On 3 November 2026. Book the call and we scope the first milestone.

Unit tests where the logic lives, Playwright for end‑to‑end and visual regression, and security controls encoded as tests. On one product Google’s CASA Tier 2 controls run as a Playwright suite on every PR.

Strict mode, no any at boundaries, generics where they remove annotations, and a lint rule for everything that cannot be a type. Data from outside goes through Zod: request bodies, environment, external APIs. One schema, one inferred type, one place to change.

Express most often, because every team already knows it and the middleware ecosystem is boring in the good way. Fastify when throughput is the bottleneck. Workers when the shape is request‑and‑response.

Start small: the one‑week audit or one reviewed pull request, both priced before we start. Hourly work has no minimum, so you can stop at any time and keep everything delivered. Code, CI and docs live in your repository from the first commit, the contract transfers the copyright to you in writing, and every project keeps a runbook and architecture notes. If I am ill, you hear it the same day. How I work.

For plain TypeScript and Node.js code, yes: builds get 8 to 12 times faster. Clear out baseUrl, es5 and node10 first. Projects whose tooling uses the compiler API wait for 7.1 (TypeScript 7.0).

Yes, since 22.18, but it only strips types: no tsconfig, no paths, no enums (Node.js TypeScript docs). For a real build, tsc or a bundler is still needed.

A February 2026 study of AI‑written TypeScript found that coding agents reach for the any escape hatch 9 times more often than human developers, yet their pull requests were accepted 1.8 times more often (Lee et al., 2026). Types only help your coding agents when strict rules stop them from switching the checks off. I migrate file by file with AI coding agents working under enforced rules. Tests pin today’s behavior first, strict mode goes on one folder at a time, and a person approves every merge, so releases can continue during the migration. In January 2024 I enabled TypeScript for a product’s Cloudflare Workers, and in March 2026 took a backend to TypeScript 6, where CommonJS is deprecated.