build: Update to typescript 5.8.0

[mydea]

This updates the TS version we use to 5.8.0.

We still downlevel to 3.8 so this should not be breaking (even if we were to use newer features eventually), downlevel-dts will fail/or our tests anyhow if we use some features that cannot be downlevelled.

---

Note

Upgrade TypeScript to 5.8 across the repo, adjust tsconfigs and deps, and fix minor type issues to satisfy stricter checks.

• Tooling/Versions:
  • Bump typescript to ~5.8.0 and update version guard in scripts/verify-packages-versions.js.
  • Update yarn.lock and package constraints; add new e2e app dev-packages/e2e-tests/test-applications/generic-ts5.0.
• TS Configs:
  • Add moduleResolution: "Node16" in multiple tsconfig.json files and test configs.
  • Add @types/node and include "node" in types where needed (e.g., Hydrogen test app).
• Type/Code Adjustments:
  • Remove unnecessary casts and add explicit non-null assertions for Map.keys().next().value.
  • Simplify handler registration (handlers[type].push(handler)), and minor TS cleanups in profiling/LRU/debug-id utilities.
  • Cloudflare/Nuxt/SvelteKit: relax Request typing and use @ts-expect-error for cf init property; avoid unused CF type import.
  • Next.js webpack: remove unnecessary non-null assertion when joining appDirPath.
  • Remix: streamline FormData attribute handling and vendor instrumentation check.

^{Written by Cursor Bugbot for commit 5ec5959. This will update automatically on new commits. Configure here.}

[github-actions]

node-overhead report 🧳

Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.

Scenario	Requests/s	% of Baseline	Prev. Requests/s	Change %
GET Baseline	9,005	-	9,344	-4%
GET With Sentry	1,430	16%	1,412	+1%
GET With Sentry (error only)	6,254	69%	6,130	+2%
POST Baseline	1,214	-	1,211	+0%
POST With Sentry	528	43%	509	+4%
POST With Sentry (error only)	1,074	88%	1,069	+0%
MYSQL Baseline	3,348	-	3,221	+4%
MYSQL With Sentry	498	15%	370	+35%
MYSQL With Sentry (error only)	2,752	82%	2,625	+5%

View base workflow run

[Lms24]

Don't we need to adjust

  "typesVersions": {
    "<5.0": {
      "build/npm/types/index.d.ts": [
        "build/npm/types-ts3.8/index.d.ts"
      ]
    }
  },

in package.json? Unless I'm missing something, users using e.g. TS 5.2 would not get the downleveled types but might run into issues with newer TS version syntax.

[mydea]

Don't we need to adjust

  "typesVersions": {
    "<5.0": {
      "build/npm/types/index.d.ts": [
        "build/npm/types-ts3.8/index.d.ts"
      ]
    }
  },

in package.json? Unless I'm missing something, users using e.g. TS 5.2 would not get the downleveled types but might run into issues with newer TS version syntax.

Yeah, you are right I suppose! Will adjust this 👍

[Lms24]

Sorry, forgot to ✅