chore(ts): bump TypeScript 5.8 → 6.0 and add tsgo for fast type-checking

- typescript: ~5.8.2 → ^6.0.3 (matches Nitro-V3 client)
- adds @typescript/native-preview (tsgo) as TypeScript 7 preview
- new `compile:fast` script using tsgo (~7× faster: 2.5s vs 17.6s)
- tsconfig cleanup ahead of TypeScript 7 deprecations:
  - removed `baseUrl` (unused: no `paths` mappings on this project)
  - removed `downlevelIteration` (target ES2022 makes it a no-op)
  - `moduleResolution`: "Node" → "bundler" (vite consumes the renderer)

Compile errors: 28 → 29. Net +1 because TS 6's tightened lib types flag
two pre-existing crypto calls (WsSessionCrypto.ts:43,48) and resolves one
prior false positive. All errors are in pre-existing code, unrelated to
the new event/snapshot APIs from 791b8ad.

package.json

@@ -22,6 +22,7 @@
   "scripts": {
     "build": "vite build",
     "compile": "tsc --project ./tsconfig.json --noEmit false",
+    "compile:fast": "tsgo --project ./tsconfig.json --noEmit",
     "eslint": "eslint ./src ./packages/*/src",
     "eslint-fix": "eslint ./src --fix",
     "test": "vitest run",
@@ -46,8 +47,9 @@
     "@vitest/coverage-v8": "^4.0.18",
     "eslint": "^9.8.0",
     "jsdom": "^27.4.0",
+    "@typescript/native-preview": "^7.0.0-dev.20260510.1",
     "tslib": "^2.6.3",
-    "typescript": "~5.8.2",
+    "typescript": "^6.0.3",
     "typescript-eslint": "^8.26.1",
     "vite": "^8.0.10",
     "vitest": "^4.1.5"

tsconfig.json

@@ -1,17 +1,15 @@
 {
   "compileOnSave": false,
   "compilerOptions": {
-    "baseUrl": "./src",
     "outDir": "./dist",
     "sourceMap": false,
     "declaration": true,
     "experimentalDecorators": true,
-    "moduleResolution": "Node",
+    "moduleResolution": "bundler",
     "esModuleInterop": true,
     "importHelpers": true,
     "isolatedModules": true,
     "resolveJsonModule": true,
-    "downlevelIteration": true,
     "allowSyntheticDefaultImports": true,
     "allowJs": true,
     "skipLibCheck": true,

yarn.lock

@@ -527,6 +527,54 @@
     "@typescript-eslint/types" "8.59.2"
     eslint-visitor-keys "^5.0.0"
 
+"@typescript/native-preview-darwin-arm64@7.0.0-dev.20260510.1":
+  version "7.0.0-dev.20260510.1"
+  resolved "https://registry.yarnpkg.com/@typescript/native-preview-darwin-arm64/-/native-preview-darwin-arm64-7.0.0-dev.20260510.1.tgz#318a841447a879e9590edf549fbf2b231a109d91"
+  integrity sha512-YpG99bf/Va1aLGP8SUQy1ClUvi4c6uTFrEQ0B5KzZb9TsOwH1RIrc/2n8UO3IAuilvwEA0EU4q8fEO3otVP2Sw==
+
+"@typescript/native-preview-darwin-x64@7.0.0-dev.20260510.1":
+  version "7.0.0-dev.20260510.1"
+  resolved "https://registry.yarnpkg.com/@typescript/native-preview-darwin-x64/-/native-preview-darwin-x64-7.0.0-dev.20260510.1.tgz#6ca57655a39f13acc7f868c3e44aff2edaa4b02b"
+  integrity sha512-NUwhwHpQn7aSX2GGBuY2bjec+hFnIz2DAna4ksVneexVE20h2U0MFzBvWrqH2C0PzPxVvGOMg4fGCvhTs93nlw==
+
+"@typescript/native-preview-linux-arm64@7.0.0-dev.20260510.1":
+  version "7.0.0-dev.20260510.1"
+  resolved "https://registry.yarnpkg.com/@typescript/native-preview-linux-arm64/-/native-preview-linux-arm64-7.0.0-dev.20260510.1.tgz#2ad2edc4ca931d9697956093d63f32970ce10fed"
+  integrity sha512-T7Zuy6h0sU+38w+N3A+YgW0XVqxIMjeHyu+945rJkiP9zk52Mwp663t1ndyeAE/N2zV+q0SWQmHNuFSXl99wJw==
+
+"@typescript/native-preview-linux-arm@7.0.0-dev.20260510.1":
+  version "7.0.0-dev.20260510.1"
+  resolved "https://registry.yarnpkg.com/@typescript/native-preview-linux-arm/-/native-preview-linux-arm-7.0.0-dev.20260510.1.tgz#e01d73e1bf9fd5780326b35ab7cc97a3f9836d01"
+  integrity sha512-UE+PIWWg7vvszSU0gS9rzgIIHCWexz3hMZDHpHRSLAleAvULCNI3EzwTRFOA4BHyQ8eReD1KZ8e76BuStEPspw==
+
+"@typescript/native-preview-linux-x64@7.0.0-dev.20260510.1":
+  version "7.0.0-dev.20260510.1"
+  resolved "https://registry.yarnpkg.com/@typescript/native-preview-linux-x64/-/native-preview-linux-x64-7.0.0-dev.20260510.1.tgz#9a1ff6947c184fcb548856e1b480adc106de1a5b"
+  integrity sha512-gJu4q4YREvjR2Lx1jUaCd/bRbTuyKf2r3rJ4tReuHyAvNse23HdGI0a9w4Z3wUbvRznxYt640IIItWsr/f3LEQ==
+
+"@typescript/native-preview-win32-arm64@7.0.0-dev.20260510.1":
+  version "7.0.0-dev.20260510.1"
+  resolved "https://registry.yarnpkg.com/@typescript/native-preview-win32-arm64/-/native-preview-win32-arm64-7.0.0-dev.20260510.1.tgz#d517af09f7ff86b9e7104714f975880c56ad4de9"
+  integrity sha512-00DtjrtkdAHOU/soYr8ncrjUvIsple8nvb29ZUATnLraNnzUgv5AS3yMve/pG/N7rVLlKy2FrXlVyVW7WAx29w==
+
+"@typescript/native-preview-win32-x64@7.0.0-dev.20260510.1":
+  version "7.0.0-dev.20260510.1"
+  resolved "https://registry.yarnpkg.com/@typescript/native-preview-win32-x64/-/native-preview-win32-x64-7.0.0-dev.20260510.1.tgz#1896d9112a99dbf24cc90814d8b6e0fd76b98d6b"
+  integrity sha512-27UeujQTEPFxhfkZL7aHnA1TlNol3nwDVFp5d6jFoP14yTXMe47kBnAJLEU2ta3REZE5PzLCs7HLV8H4VdxGgA==
+
+"@typescript/native-preview@^7.0.0-dev.20260510.1":
+  version "7.0.0-dev.20260510.1"
+  resolved "https://registry.yarnpkg.com/@typescript/native-preview/-/native-preview-7.0.0-dev.20260510.1.tgz#983a6d94d132b34d916b95bb1e3d0e687525d12a"
+  integrity sha512-05U6/Im+vmqGrFAVrHSeuoXBCwShhbiA+93VpSwEBYP4LMWk2JW9q87MydamL5g6ISEjIVlwQ4Dx35CauPAwpA==
+  optionalDependencies:
+    "@typescript/native-preview-darwin-arm64" "7.0.0-dev.20260510.1"
+    "@typescript/native-preview-darwin-x64" "7.0.0-dev.20260510.1"
+    "@typescript/native-preview-linux-arm" "7.0.0-dev.20260510.1"
+    "@typescript/native-preview-linux-arm64" "7.0.0-dev.20260510.1"
+    "@typescript/native-preview-linux-x64" "7.0.0-dev.20260510.1"
+    "@typescript/native-preview-win32-arm64" "7.0.0-dev.20260510.1"
+    "@typescript/native-preview-win32-x64" "7.0.0-dev.20260510.1"
+
 "@vitest/coverage-v8@^4.0.18":
   version "4.1.5"
   resolved "https://registry.yarnpkg.com/@vitest/coverage-v8/-/coverage-v8-4.1.5.tgz#26bbdbebecd66be77fa1b63a9ed985dd86a3ba85"
@@ -1676,6 +1724,11 @@ typescript-eslint@^8.26.1:
     "@typescript-eslint/typescript-estree" "8.59.2"
     "@typescript-eslint/utils" "8.59.2"
 
+typescript@^6.0.3:
+  version "6.0.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-6.0.3.tgz#90251dc007916e972786cb94d74d15b185577d21"
+  integrity sha512-y2TvuxSZPDyQakkFRPZHKFm+KKVqIisdg9/CZwm9ftvKXLP8NRWj38/ODjNbr43SsoXqNuAisEf1GdCxqWcdBw==
+
 typescript@~5.5.4:
   version "5.5.4"
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-5.5.4.tgz#d9852d6c82bad2d2eda4fd74a5762a8f5909e9ba"