Learnings · 2026-09-15 | WOOHYUN PARK: BLOG

TypeScript 7 does not yet provide the existing JavaScript Compiler API
The TypeScript team is working toward making the API available in 7.1.
Next internally uses the Compiler API, and created an experimental feature called useTypeScriptCli to bypass it and benefit from TypeScript 7's faster performance

TypeScriptAnnouncing TypeScript 7.0 Beta - TypeScriptToday we are absolutely thrilled to announce the release of TypeScript 7.0 Beta! If you haven't been following TypeScript 7.0's development, this release (opens in a new window)GitHubmicrosoft/TypeScriptTypeScript is a superset of JavaScript that compiles to clean JavaScript output. - microsoft/TypeScript (opens in a new window)nextjs.orgnext.config.js Options: useTypeScriptCli | Next.jsRun the project-local TypeScript CLI for type checking during production builds. (opens in a new window)

A diagnostic showing the shadcn no-restyle rule rejecting p-4 on Button and directing the user to a size variant or a gap on the parent

An example declaring allowed style categories for Button, CardTitle, and CardContent in shadcn no-restyle contracts

shadcn released shadcn-ui/lint.
It seems worth taking a cue from how it uses variables to tell you which options are available

GitHubGitHub - shadcn-ui/lint: An agent-first linter for Tailwind design systems. Write design system rules that agents can verify.An agent-first linter for Tailwind design systems. Write design system rules that agents can verify. - shadcn-ui/lint (opens in a new window)X (formerly Twitter)shadcn (@shadcn) on Xhttps://x.com/shadcn/status/2099534231114314145?s=46 (opens in a new window)