chore(deps): migrate monorepo to typescript 7 (#38)

* chore(deps): migrate monorepo to typescript 7

- typescript ^7 in all five manifests, settling the split 6.0.3 / ^6
  version policy; typecheck scripts move from tsgo to tsc since TS7
  ships the native compiler as the typescript package
- @typescript/native-preview is now declared only where tsdown's dts
  generator actually needs it (cli, template-generator) instead of
  hoisted from the root
- next 16.2.7 -> 16.2.12 in apps/web: required for
  experimental.useTypeScriptCli (TS7 has no JS compiler API for next
  build's default checker) and clears the open Next security advisories
- cli build drops its dead dts pass (the package exports no types);
  under TS7 that pass leaked .d.ts files into template-generator/src
- lockfile regenerated; suppress unicorn/throw-new-error on
  better-result TaggedError factories, whose autofix inserts `new` and
  breaks them (rule arrived with the oxlint bump in the refresh)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* chore(cli): add changeset for typescript 7 toolchain

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* chore(deps): drop @typescript/native-preview entirely

With typescript 7 installed as the typescript package, rolldown-plugin-dts
uses its native compiler for dts generation directly; the preview package
was only the fallback for pre-7 setups. The earlier .d.ts leak came from
the CLI's since-removed dts pass, not from removing this package.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: PunGrumpy

.changeset/typescript-7-toolchain.md

@@ -0,0 +1,5 @@
+---
+"@vernostudio/cli": patch
+---
+
+Build the CLI with the TypeScript 7 toolchain. The published package no longer ships an unused empty `dist/index.d.mts` stub (the CLI exposes a binary, not a typed API); runtime behavior is unchanged.

apps/web/next.config.ts

@@ -3,6 +3,9 @@ import type { NextConfig } from "next";
 const nextConfig: NextConfig = {
   experimental: {
     turbopackFileSystemCacheForDev: true,
+    // TypeScript 7 has no JS compiler API; run the project-local tsc CLI for
+    // build-time type checking. https://nextjs.org/docs/app/api-reference/config/typescript
+    useTypeScriptCli: true,
   },
 
   images: {

apps/web/package.json

@@ -7,15 +7,15 @@
     "build": "next build",
     "start": "next start",
     "test": "bun test",
-    "typecheck": "next typegen && tsgo --noEmit"
+    "typecheck": "next typegen && tsc --noEmit"
   },
   "dependencies": {
     "@shikijs/langs": "^4.2.0",
     "@shikijs/themes": "^4.2.0",
     "@t3-oss/env-nextjs": "^0.12.00",
     "@vernostudio/design-system": "workspace:*",
     "lucide-react": "^1.17.0",
-    "next": "16.2.7",
+    "next": "16.2.12",
     "posthog-js": "^1.380.1",
     "posthog-node": "^5.36.2",
     "react": "19.2.7",
@@ -32,6 +32,6 @@
     "@types/react-dom": "^19",
     "@vernostudio/typescript-config": "workspace:*",
     "tailwindcss": "^4.3.0",
-    "typescript": "^6"
+    "typescript": "^7"
   }
 }

bun.lock

@@ -21,13 +21,12 @@
   },
   "devDependencies": {
     "@changesets/cli": "^2.31.0",
-    "@typescript/native-preview": "^7.0.0-dev.20260605.1",
     "husky": "^9.1.7",
     "mitata": "^1.0.34",
     "oxfmt": "^0.53.0",
     "oxlint": "^1.68.0",
     "turbo": "^2.9.16",
-    "typescript": "6.0.3",
+    "typescript": "^7",
     "ultracite": "7.8.1"
   },
   "engines": {

package.json

@@ -47,7 +47,7 @@
     "dev": "tsdown --watch",
     "test": "bun test",
     "test:coverage": "bun test --coverage",
-    "typecheck": "tsgo --noEmit",
+    "typecheck": "tsc --noEmit",
     "bench": "bun run benchmarks/cli.bench.ts",
     "prepublishOnly": "bun run build"
   },
@@ -64,7 +64,7 @@
     "@vernostudio/template-generator": "workspace:*",
     "@vernostudio/typescript-config": "workspace:*",
     "tsdown": "^0.22.2",
-    "typescript": "^6",
+    "typescript": "^7",
     "ultracite": "^7.8.0"
   }
 }

packages/cli/package.json

@@ -6,7 +6,10 @@ export default defineConfig({
     alwaysBundle: ["@vernostudio/template-generator"],
     onlyBundle: ["better-result", "handlebars", "source-map"],
   },
-  dts: true,
+  // The CLI ships a binary, not a typed API (exports declare no types), and
+  // under TypeScript 7 the dts pass leaks .d.ts files into the bundled
+  // template-generator's src/.
+  dts: false,
   entry: ["src/index.ts"],
   format: ["esm"],
   outDir: "dist",

packages/cli/tsdown.config.ts

@@ -4,7 +4,7 @@
   "private": true,
   "sideEffects": false,
   "scripts": {
-    "typecheck": "tsgo --noEmit"
+    "typecheck": "tsc --noEmit"
   },
   "dependencies": {
     "@base-ui/react": "^1.5.0",
@@ -32,7 +32,7 @@
     "@types/react-dom": "^19",
     "@vernostudio/typescript-config": "workspace:*",
     "shadcn": "^4.10.0",
-    "typescript": "^6"
+    "typescript": "^7"
   },
   "peerDependencies": {
     "react": "19.2.7",

packages/design-system/package.json

@@ -46,7 +46,7 @@
     "prebuild": "bun run generate:templates",
     "build": "tsdown",
     "dev": "tsdown --watch",
-    "typecheck": "bun run generate:templates && tsgo --noEmit",
+    "typecheck": "bun run generate:templates && tsc --noEmit",
     "test": "bun run generate:templates && bun test",
     "test:coverage": "bun run generate:templates && bun test --coverage"
   },
@@ -57,9 +57,8 @@
   "devDependencies": {
     "@types/bun": "^1.3.14",
     "@types/node": "^25.9.1",
-    "@typescript/native-preview": "^7.0.0-dev.20260605.1",
     "@vernostudio/typescript-config": "workspace:*",
     "tsdown": "^0.22.2",
-    "typescript": "^6"
+    "typescript": "^7"
   }
 }

packages/template-generator/package.json

@@ -1,5 +1,6 @@
 import { TaggedError } from "better-result";
 
+// oxlint-disable-next-line unicorn/throw-new-error -- TaggedError is better-result's class factory; the autofix (inserting `new`) breaks it
 export class FileWriteError extends TaggedError("FileWriteError")<{
   message: string;
   path?: string;