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feat(dev): add OpenTunnel as a --tunnel provider - #1611

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@atinux atinux commented Oct 9, 2026 •

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Written by an AI agent (OpenCode) on behalf of @atinux, who directed the design. The updates for @opentunnel/client@0.6.1 were made by an AI agent (Amp) on behalf of @atinux.

Questions

  • Shall we keep cloudflare as default option if we run --tunnel as prompting could be seen as a breaking change for user already using this option?

📚 Description

OpenTunnel gives each machine a stable hostname, and TLS ends on the developer's machine, so the relay can't read the traffic. This PR adds it as a second --tunnel provider, next to the Cloudflare quick tunnel:

nuxt dev --tunnel=opentunnel   # the same URL on each run, per project
nuxt dev --tunnel=cloudflare   # a new trycloudflare.com URL on each run (unchanged)
nuxt dev --tunnel              # uses the saved choice, or asks once

The CLI stays lean. @opentunnel/client@^0.6.0 (with its effect peer) is not a dependency of @nuxt/cli. It is resolved from the project, and when it's missing, nuxt dev offers to install it as a dev dependency with the project's package manager, through the same runInstall as nuxt module add. Without a terminal, it prints the install command and starts without a tunnel. @nuxt/cli's dist grows by about 19 kB.

Other points:

  • Same URL on each run: the route name comes from a random seed in ~/.nuxtrc (tools.opentunnel.seed) and the project path. The chosen provider is saved as tools.tunnel.provider.
  • Hard restarts: the new fork can't attach the route until the outgoing process lets go of it, which it only does once the fork is serving. During a handover, the fork returns the URL at once and attaches in the background.
  • Two dev servers for one project: a route serves one bridge at a time. When another nuxt dev already holds it, the second one stops at the first route conflict and starts without a tunnel, instead of waiting for the 20 s connect timeout. Later reconnects still retry, as the relay may briefly hold the process's own previous bridge.
  • --https: OpenTunnel forwards plain TCP, so --tunnel=opentunnel uses Cloudflare instead, with a warning.
  • Flag parsing: --tunnel is now a string flag. Node's parseArgs would read --tunnel --port 3000 as tunnel="--port", so a bare --tunnel is rewritten to --tunnel= before citty parses it.
  • dev/tunnel.ts moved to dev/tunnel/cloudflared.ts, unchanged apart from the function name.

Tested: unit tests for the flag, the prompt, the route name, the install flow and the providers. End to end, in a fresh npm project: the prompt installed both packages, a real tunnel served the page, and a second run reused the same URL. Hard restarts (from a .env change) and the Vite HMR WebSocket also worked through the tunnel. With SDK 0.6.1, a real tunnel also served the page, a second tunnel on the same route stopped within about 100 ms, and a handover served the new server once the old one closed.

Known limits:

  • A package manager with a release-age policy (pnpm 11's default, or npm's min-release-age) refuses SDK releases younger than its limit. The CLI then shows the package manager's error and starts without a tunnel. @opentunnel/client@0.6.1 was published on October 23, past pnpm's default, so the repo no longer lists it in minimumReleaseAgeExclude.

`--tunnel` now takes a provider: `cloudflare` (the existing quick tunnel)
or `opentunnel`, which gives each project the same end-to-end encrypted
URL on every run. A bare `--tunnel` asks once and saves the choice in
`~/.nuxtrc`.

The OpenTunnel SDK is not a dependency of the CLI: it is resolved from
the project and, when missing, installed there as a dev dependency with
the project's package manager after a prompt.
@socket-security

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Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff Package Supply Chain
Security
Vulnerability Quality Maintenance License
Addedeffect@​4.1.01001009398100
Added@​opentunnel/​client@​0.6.19810010095100

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  • nuxt-cli-playground

    npm i https://pkg.pr.new/create-nuxt@1611
    
    npm i https://pkg.pr.new/nuxi@1611
    
    npm i https://pkg.pr.new/@nuxt/cli@1611
    

commit: d690639

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CLI benchmark

@nuxt/cli v4.0.1 (baseline) vs v4.0.1 (this PR)

Metric baseline v4.0.1 head v4.0.1 Delta
nuxt --version wall time (median) 70 ms 71 ms +0.6%
nuxt --help wall time (median) 144 ms 143 ms -1.0%
nuxt dev --help wall time (median) 110 ms 109 ms -1.0%
nuxt --version modules loaded 35 35 0.0%
nuxt --version built-ins loaded 29 29 0.0%
nuxt --help modules loaded 136 136 0.0%
nuxt --help built-ins loaded 93 93 0.0%
nuxt dev --help modules loaded 64 64 0.0%
nuxt dev --help built-ins loaded 90 90 0.0%
Installed node_modules 2.48 MB 2.50 MB +0.9%
Published tarball (packed) 245.3 kB 252.1 kB +2.8%
Full report

@nuxt/cli v4.0.1 (baseline) vs v4.0.1 (head)

Setting Value
Baseline ref:cd8f364de8653a4aba9b0b22d8508cb24a2222ff (v4.0.1)
Head local packages/nuxt-cli at 0bce31c (v4.0.1)
Node v24.22.2
OS Linux 7.0.0 (kernel 7.0.0-1017-azure)
CPU AMD EPYC 9V74 80-Core Processor x 4
Memory 15.6 GB
Load average at start 1.19, 0.35, 0.12
Run started 2026-10-30T22:47:10.268Z

Cold CLI startup

Median of 15 interleaved runs per command, one warmup discarded.

Command baseline v4.0.1 median head v4.0.1 median Delta baseline v4.0.1 min / p95 head v4.0.1 min / p95
nuxt --version 70 ms 71 ms +0.6% 68 ms / 74 ms 68 ms / 74 ms
nuxt --version (first output byte) 65 ms 66 ms +0.6% 63 ms / 69 ms 62 ms / 68 ms
nuxt --help 144 ms 143 ms -1.0% 139 ms / 146 ms 140 ms / 147 ms
nuxt --help (first output byte) 138 ms 137 ms -1.0% 133 ms / 140 ms 134 ms / 141 ms
nuxt dev --help 110 ms 109 ms -1.0% 107 ms / 112 ms 106 ms / 114 ms
nuxt dev --help (first output byte) 104 ms 103 ms -1.0% 100 ms / 105 ms 100 ms / 108 ms
nuxt <unknown-command> (no-op) 153 ms 154 ms +0.8% 151 ms / 157 ms 150 ms / 158 ms
nuxt <unknown-command> (no-op) (first output byte) 146 ms 147 ms +0.3% 144 ms / 150 ms 143 ms / 150 ms

Module load cost

Counted with a module.registerHooks load hook, compile cache disabled. Counts every JS module actually evaluated on that code path (native addons excluded). Built-ins loaded after bootstrap are counted separately, including the internal modules they load.

Command baseline v4.0.1 modules head v4.0.1 modules Delta baseline v4.0.1 source bytes head v4.0.1 source bytes Delta baseline v4.0.1 built-ins head v4.0.1 built-ins Delta
nuxt --version 35 35 0.0% 300.4 kB 301.8 kB +0.5% 29 29 0.0%
nuxt --help 136 136 0.0% 861.0 kB 862.9 kB +0.2% 93 93 0.0%
nuxt dev --help 64 64 0.0% 460.2 kB 462.1 kB +0.4% 90 90 0.0%

Install footprint and published tarball

Each version installed on its own into an empty project with nothing but @nuxt/cli as a dependency, so the tree is exactly the CLI and its transitive dependencies. npm cache is warm and the registry is only consulted for metadata, so install wall time is indicative, not a network benchmark.

Metric baseline v4.0.1 head v4.0.1 Delta
Direct dependencies of @nuxt/cli 23 23 0.0%
Packages in the installed tree (unique name@version) 39 39 0.0%
Unique package names 39 39 0.0%
Package directories on disk (cross-check) 32 32 0.0%
Installed node_modules on disk 2.48 MB 2.50 MB +0.9%
Installed files 439 444 +1.1%
Install wall time (warm npm cache, median of 3) 1.37 s 1.38 s +0.4%
Published tarball (packed) 245.3 kB 252.1 kB +2.8%
Published tarball (unpacked) 793.9 kB 815.8 kB +2.8%
Files in tarball 104 109 +4.8%

Interleaved runs on a shared runner: trust the deltas, not the absolute timings. The dev, restart and build suites run locally via pnpm bench:cli.

@atinux
atinux marked this pull request as ready for review October 9, 2026 14:20
@atinux
atinux requested a review from danielroe as a code owner October 9, 2026 14:20
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Walkthrough
📝 Walkthrough

Walkthrough

The dev command now accepts Cloudflare or OpenTunnel as tunnel providers and can prompt for a selection. It saves provider preferences and OpenTunnel route seeds in .nuxtrc. OpenTunnel support includes project-local SDK discovery and installation, tunnel provisioning, connection management, and handover behavior. The listener passes provider configuration to tunnel startup. OpenTunnel requests use Cloudflare when the dev server uses HTTPS.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: Minimal · up to f7c54

The reviewed dependency declarations align with the project-local SDK resolution contract.

Pre-merge checks: Passed 4
Check name Status Explanation
Title check Passed The title accurately and concisely identifies the main change: adding OpenTunnel as a --tunnel provider.
Linked Issues check Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check Passed Check skipped because no linked issues were found for this pull request.
Description check Passed The pull request description directly describes the OpenTunnel provider, Cloudflare fallback, flag parsing, installation flow, configuration persistence, restart handling, and tests covered by the cha…
Full details: Description check

Explanation

The pull request description directly describes the OpenTunnel provider, Cloudflare fallback, flag parsing, installation flow, configuration persistence, restart handling, and tests covered by the changeset.

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🤖 Completed: Fix pre-merge checks in PR #1611 — View commit e2aa90a

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Merging this PR will not alter performance

1 warning

⚠️ 2 benchmarks are dominated by system calls

System calls cannot be simulated consistently and are left out of the measure. The reported value understates the real cost. Switch to the Walltime instrument to measure them.

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See affected benchmarks

✅ 2 untouched benchmarks


Comparing feat/opentunnel (d690639) with main (cd8f364)

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Caution

Some comments are outside the diff and can’t be posted inline due to GitHub limitations.

⚠️ Outside diff range comments (1)

🟡 Minor · Pass the bound host to OpenTunnel. · opentunnel.ts:60-65

packages/nuxt-cli/src/dev/tunnel/opentunnel.ts:60-65
🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

Pass the bound host to OpenTunnel.

When ListenOptions.hostname is an explicit non-loopback address, the listener binds to that address, but startOpenTunnel maps the route to localhost:${port}. The tunnel URL can therefore be advertised while forwarding to the wrong interface.

Pass the effective hostname through the listener and dispatcher. Preserve localhost for wildcard binds. The same mapping is used for normal connections and handovers.

Suggested fix
diff --git a/packages/nuxt-cli/src/dev/listen.ts b/packages/nuxt-cli/src/dev/listen.ts
@@
-      tunnel = await startTunnel(options.tunnel, { protocol, port: address.port, handover: options.handover })
+      tunnel = await startTunnel(options.tunnel, {
+        protocol,
+        port: address.port,
+        hostname: anyHost ? 'localhost' : hostname,
+        handover: options.handover,
+      })
diff --git a/packages/nuxt-cli/src/dev/tunnel/index.ts b/packages/nuxt-cli/src/dev/tunnel/index.ts
@@
 export interface TunnelTarget {
   protocol: 'http' | 'https'
   port: number
+  hostname?: string
   /** The server is taking over from a process that still serves the port. */
   handover?: boolean
 }
@@
-      return startOpenTunnel(options.route, target.port, { handover: target.handover, rootDir: options.rootDir })
+      return startOpenTunnel(options.route, target.port, {
+        hostname: target.hostname,
+        handover: target.handover,
+        rootDir: options.rootDir,
+      })
diff --git a/packages/nuxt-cli/src/dev/tunnel/opentunnel.ts b/packages/nuxt-cli/src/dev/tunnel/opentunnel.ts
@@
 export interface OpenTunnelOptions {
   /** The project the SDK is installed in. */
   rootDir: string
+  /** The local hostname where the dev server accepts connections. */
+  hostname?: string
@@
- * Expose `localhost:<port>` as `https://<route>.<hostname>` through the user's
+ * Expose the local `<hostname>:<port>` as `https://<route>.<hostname>` through the user's
@@
-  const routes = { [route]: `localhost:${port}` }
+  const routes = { [route]: `${options.hostname || 'localhost'}:${port}` }
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Review comment at @packages/nuxt-cli/src/dev/tunnel/opentunnel.ts around lines
60 - 65:
Pass the effective listener hostname through the listen and tunnel-dispatch flow
into startOpenTunnel, and use it when building the OpenTunnel route target.
Preserve localhost for wildcard binds and apply the same hostname mapping to
normal connections and handovers.

🤖 Prompt to fix review comments
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Outside diff comments:
Review comments at @packages/nuxt-cli/src/dev/tunnel/opentunnel.ts:
- Around line 60-65: Pass the effective listener hostname through the listen and
tunnel-dispatch flow into startOpenTunnel, and use it when building the
OpenTunnel route target. Preserve localhost for wildcard binds and apply the
same hostname mapping to normal connections and handovers.

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  • packages/nuxt-cli/src/commands/dev.ts
  • packages/nuxt-cli/src/dev/tunnel/cloudflared.ts
  • packages/nuxt-cli/src/dev/tunnel/opentunnel.ts
  • packages/nuxt-cli/src/dev/tunnel/resolve.ts
  • packages/nuxt-cli/src/main.ts
  • packages/nuxt-cli/src/run.ts
🚧 Files skipped from review as they are similar to previous changes (6)
  • packages/nuxt-cli/src/main.ts
  • packages/nuxt-cli/src/run.ts
  • packages/nuxt-cli/src/dev/tunnel/cloudflared.ts
  • packages/nuxt-cli/src/commands/dev.ts
  • packages/nuxt-cli/src/dev/tunnel/opentunnel.ts
  • packages/nuxt-cli/src/dev/tunnel/resolve.ts

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Both providers forwarded to `localhost:<port>`, which does not reach a
server bound to one non-loopback address (`--host 192.168.1.5`), nor one
bound to `::1` when `localhost` resolves to 127.0.0.1. `localhost` is
kept for servers on every interface.

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Actionable comments posted: 1


🤖 Coding task started

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @packages/nuxt-cli/src/dev/tunnel/index.ts:
- Line 47: Update the tunnel selection flow around `resolveTunnelOptions` so
`--https --tunnel=opentunnel` chooses the Cloudflare fallback before requiring
or preparing the OpenTunnel SDK. Ensure the resolver returns options that allow
the listener to start the Cloudflare tunnel instead of returning `undefined`
when the SDK is unavailable.

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  • packages/nuxt-cli/src/dev/listen.ts
  • packages/nuxt-cli/src/dev/tunnel/index.ts
  • packages/nuxt-cli/src/dev/tunnel/opentunnel.ts
  • packages/nuxt-cli/test/unit/dev/tunnel-lazy.spec.ts
  • packages/nuxt-cli/test/unit/dev/tunnel.spec.ts
  • packages/nuxt-cli/test/unit/listen.spec.ts

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antfu and others added 17 commits October 24, 2026 20:15
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Supported SDK range moves to ^0.6.0, so projects get the API retries
(0.5.1) and HTTP proxy support for the bridge (0.6.1). The 0.5 and 0.6
releases only add APIs. 0.6.1 is past the default release age, so the
minimumReleaseAgeExclude entries for 0.4.0 are dropped.

Amp-Thread-ID: https://ampcode.com/threads/T-01a18e9d-0776-7773-aa21-c61d17bc5563
- The connect timeout aborts the attach through `signal` instead of
  racing a promise that kept retrying in the background.
- A route conflict on the first attach stops at once, with a warning
  that another `nuxt dev` serves the project, instead of waiting 20s.
  Conflicts on later reconnects still retry, since the relay may still
  hold this process's previous bridge, which `onRouteConflict: 'fail'`
  would turn into a permanent stop.
- A handover tunnel closes by aborting, which also stops a bridge still
  waiting for the route.
- URLs come from `connection.urls` and `publicUrl`, provisioning uses
  `tunnel.ensure`, and events go through `onEvent`.
- Tests use the SDK's `ROUTE_LABEL_PATTERN` instead of a copy.

Amp-Thread-ID: https://ampcode.com/threads/T-01a18e9d-0776-7773-aa21-c61d17bc5563

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