Goran Štimac 
TypeScript changed shape in 2026. TypeScript 6.0, released on March 23, was the bridge release: it introduced stricter defaults (strict: true, target: es2025, and types: []) and deprecated legacy options such as target: es5, baseUrl, and Node 10 module resolution. TypeScript 7.0, released on July 8, completed the compiler and language-service rewrite in Go. Microsoft reports roughly 8–12× faster full builds on large codebases, lower peak memory use, and parallel type-checking.
The upgrade is practical, but not automatic. Move from 5.9 to 6.0 first, review tsconfig.json, and add required global packages explicitly—for example, "types": ["node"]. In 7.0, the 6.0 deprecations become errors, so old configuration can stop a build. Smaller projects may see a less dramatic speedup than the headline benchmarks.
There is one important web-development caveat: 7.0 does not yet include the programmatic API that Astro, Vue, Svelte, and Angular template checkers need. Keep those integrations on 6.0 for now. The TypeScript team expects a new API in 7.1, but has not announced a date. For migration details, compare the official 6.0 and 7.0 announcements.
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