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TypeScript 7

The compiler got rewritten in Go and everything else stayed where it was. That combination makes TypeScript 7 an odd upgrade: your types are safe, your config probably isn't. This page is the whole of Coding Dunia's TypeScript 7 coverage, arranged in the order you'll actually need it, from "what is this" through "will my repo survive" to "why is strict mode yelling at me".

General availability
July 8, 2026
What changed
tsc rewritten in Go, type system untouched
Microsoft benchmark
77.8s to 7.5s on the VS Code codebase
Our measurement
4.4x to 5.8x across three real workspaces
Biggest gotcha
strict defaults to on, ES5 and AMD output are gone
Still waiting
the programmatic compiler API, so vue-tsc and friends lag

Start here if the release is new to you

For anyone who's heard "TypeScript is ten times faster now" and wants to know what that sentence is hiding. Read these before you open a tsconfig. They cost you twenty minutes and they'll stop you from making the one mistake that costs a day: jumping from 5.x straight to 7 and meeting every removed flag at once, in Go error messages you've never seen before.

Then check your own project

Guides describe the average repo. Yours isn't the average repo. Paste your real tsconfig.json below and the checker scores it against everything TypeScript 7 removed or changed, with each finding linked to the fix. It runs in your browser, so a config from a private repo never leaves your machine. Want the package.json pass as well, the one that catches typescript-eslint and ts-jest versions that will crash on the native compiler? That lives in the full readiness checker. And if you're starting a package rather than repairing one, the tsconfig.json generator emits a TypeScript 7-shaped config from a preset instead of making you back into one.

Paste it below for an instant readiness score against everything TypeScript 7 removed or changed. Runs in your browser, nothing is uploaded.

Need to check package.json too, or want the full breakdown? Use the full TypeScript 7 Migration Readiness Checker.

Will your toolchain come along?

This is the section that saves people the most grief, and it's the one nobody reads first. The dividing line is simple: tools that call tsc on the command line work today, tools that import the compiler as a library do not, because the programmatic API hasn't stabilized for the native build. So React, Next.js, Node, and plain TypeScript are fine right now. Vue's vue-tsc, svelte-check, astro check, MDX type-checking, and Angular's template checker are not, and no amount of config will change that. Check where you sit before you plan a migration date.

Run the migration

Four routes to the same place, and the right one depends on the shape of your repository rather than on how much TypeScript you know. Take the main guide for the ordered path off 5.x. Take the React checklist if you have one Vite package and want a list you can tick. Take the monorepo guide the moment there's more than one package.json, because project references change the whole procedure. The CI piece is the last one either way: none of this counts until it's green on a runner.

Is it actually faster?

Every vendor benchmark is run on the workload that flatters it, and Microsoft's is no exception. It's a real number on a real codebase, it's just not your codebase. So we ran the upgrade on the monorepo behind this site and published the commands, the configs, and the raw timings, including the runs where the gap was narrower than advertised. My honest read: the 10x headline is closer to 5x on ordinary repos, and 5x is still the biggest single win the TypeScript toolchain has ever shipped.

When strict mode turns itself on

Here's where most migrations stall, and it has nothing to do with Go. TypeScript 7 makes strict the default, so a repo that was quietly running loose for four years suddenly reports a few hundred errors that the compiler rewrite didn't cause and can't fix. That's not a migration failure. It's four years of deferred maintenance arriving on one afternoon. These two cover the flags behind it and the order worth fixing them in.

How this page stays current

TypeScript 7 shipped in July 2026 and the ecosystem around it is still moving, so the freshness stamp on each card above is the real one from the article, not a decoration. Every code sample here is run against the version it names before it's published and re-run when a major release lands. Numbers that came off our own machines say so, and numbers that came from Microsoft are attributed to Microsoft. When vue-tsc and svelte-check ship native-compatible builds, the framework support matrix changes and this hub changes with it.

Missing something you'd expect to find, or hit a migration failure none of these guides covers? Say so on the contact page. The rest of the archive lives under TypeScript articles, and the other in-browser tools are on the tools page.