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[swc-plugin] Fix Windows WASM plugin linking#2174

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May 30, 2026
Merged

[swc-plugin] Fix Windows WASM plugin linking#2174
TooTallNate merged 1 commit into
mainfrom
peter/fix-swc-plugin-windows-link

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@VaguelySerious VaguelySerious commented May 30, 2026 •
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  • allow undefined host imports when linking the SWC plugin WASM target
  • add an empty changeset for CI/build-only plumbing

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PR #2169 failed Windows unit tests while building @workflow/swc-plugin with rust-lld undefined symbols for SWC host imports such as __emit_diagnostics, __set_transform_result, and __get_transform_context

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🦋 Changeset detected

Latest commit: c3845c3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 0 packages

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

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📊 Benchmark Results

📈 Comparing against baseline from main branch. Green 🟢 = faster, Red 🔺 = slower.

workflow with no steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
💻 Local 🥇 Nitro 0.031s (-28.1% 🟢) 1.005s (~) 0.974s 10 1.00x
💻 Local Express 0.044s (~) 1.006s (~) 0.961s 10 1.43x
🐘 Postgres Express 0.055s (-5.2% 🟢) 1.011s (~) 0.956s 10 1.77x
💻 Local Next.js (Turbopack) 0.063s 1.006s 0.944s 10 2.02x
🐘 Postgres Nitro 0.063s (-33.4% 🟢) 1.013s (-2.9%) 0.950s 10 2.05x
🐘 Postgres Next.js (Turbopack) 0.065s 1.011s 0.946s 10 2.10x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Express 0.269s (+14.4% 🔺) 2.270s (+6.3% 🔺) 2.001s 10 1.00x
▲ Vercel Nitro 0.287s (-29.9% 🟢) 2.100s (-16.3% 🟢) 1.812s 10 1.07x
▲ Vercel Next.js (Turbopack) 0.292s (+15.9% 🔺) 2.186s (-6.3% 🟢) 1.895s 10 1.08x

🔍 Observability: Express | Nitro | Next.js (Turbopack)

workflow with 1 step

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
💻 Local 🥇 Nitro 1.070s (-5.4% 🟢) 2.005s (~) 0.935s 10 1.00x
💻 Local Express 1.092s (-3.0%) 2.007s (~) 0.915s 10 1.02x
🐘 Postgres Nitro 1.108s (-2.8%) 2.009s (~) 0.901s 10 1.03x
🐘 Postgres Express 1.108s (-3.4%) 2.010s (~) 0.902s 10 1.04x
💻 Local Next.js (Turbopack) 1.132s 2.005s 0.873s 10 1.06x
🐘 Postgres Next.js (Turbopack) 1.155s 2.011s 0.857s 10 1.08x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Nitro 1.671s (-57.1% 🟢) 3.309s (-44.0% 🟢) 1.638s 10 1.00x
▲ Vercel Express 1.683s (-10.3% 🟢) 3.720s (-2.3%) 2.037s 10 1.01x
▲ Vercel Next.js (Turbopack) 1.819s (-10.6% 🟢) 3.750s (-2.1%) 1.931s 10 1.09x

🔍 Observability: Nitro | Express | Next.js (Turbopack)

workflow with 10 sequential steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
💻 Local 🥇 Nitro 10.392s (-5.1% 🟢) 11.019s (~) 0.628s 3 1.00x
💻 Local Express 10.536s (-3.5%) 11.022s (~) 0.486s 3 1.01x
🐘 Postgres Express 10.539s (-3.9%) 11.018s (~) 0.479s 3 1.01x
🐘 Postgres Nitro 10.561s (-2.9%) 11.019s (~) 0.458s 3 1.02x
💻 Local Next.js (Turbopack) 10.869s 11.355s 0.486s 3 1.05x
🐘 Postgres Next.js (Turbopack) 10.947s 11.352s 0.405s 3 1.05x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Express 13.488s (-20.6% 🟢) 15.094s (-24.6% 🟢) 1.606s 3 1.00x
▲ Vercel Nitro 13.653s (-42.5% 🟢) 15.506s (-38.3% 🟢) 1.853s 2 1.01x
▲ Vercel Next.js (Turbopack) 14.872s (-14.1% 🟢) 17.555s (-9.5% 🟢) 2.683s 2 1.10x

🔍 Observability: Express | Nitro | Next.js (Turbopack)

workflow with 25 sequential steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
💻 Local 🥇 Nitro 13.455s (-10.7% 🟢) 14.026s (-12.5% 🟢) 0.571s 5 1.00x
🐘 Postgres Express 13.748s (-5.7% 🟢) 14.020s (-6.7% 🟢) 0.272s 5 1.02x
💻 Local Express 13.750s (-8.2% 🟢) 14.028s (-6.7% 🟢) 0.278s 5 1.02x
🐘 Postgres Nitro 13.830s (-5.2% 🟢) 14.018s (-6.7% 🟢) 0.188s 5 1.03x
💻 Local Next.js (Turbopack) 14.308s 15.030s 0.721s 4 1.06x
🐘 Postgres Next.js (Turbopack) 14.410s 15.016s 0.606s 4 1.07x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Next.js (Turbopack) 21.902s (-58.3% 🟢) 24.175s (-55.7% 🟢) 2.273s 3 1.00x
▲ Vercel Nitro 22.138s (-65.7% 🟢) 23.673s (-64.5% 🟢) 1.535s 3 1.01x
▲ Vercel Express 22.200s (-55.9% 🟢) 24.008s (-54.3% 🟢) 1.808s 3 1.01x

🔍 Observability: Next.js (Turbopack) | Nitro | Express

workflow with 50 sequential steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
💻 Local 🥇 Nitro 11.834s (-29.5% 🟢) 12.020s (-29.4% 🟢) 0.186s 8 1.00x
🐘 Postgres Express 12.414s (-11.4% 🟢) 13.017s (-10.8% 🟢) 0.603s 7 1.05x
💻 Local Express 12.466s (-24.9% 🟢) 13.024s (-23.5% 🟢) 0.558s 7 1.05x
🐘 Postgres Nitro 12.554s (-10.1% 🟢) 13.019s (-9.0% 🟢) 0.465s 7 1.06x
💻 Local Next.js (Turbopack) 13.512s 14.027s 0.515s 7 1.14x
🐘 Postgres Next.js (Turbopack) 13.771s 14.163s 0.392s 7 1.16x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Nitro 31.415s (-92.6% 🟢) 33.040s (-92.2% 🟢) 1.626s 3 1.00x
▲ Vercel Next.js (Turbopack) 31.547s (-92.0% 🟢) 34.044s (-91.4% 🟢) 2.496s 3 1.00x
▲ Vercel Express 31.854s (-73.7% 🟢) 33.679s (-72.8% 🟢) 1.824s 3 1.01x

🔍 Observability: Nitro | Next.js (Turbopack) | Express

Promise.all with 10 concurrent steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
💻 Local 🥇 Nitro 1.174s (-28.0% 🟢) 2.005s (-3.3%) 0.830s 15 1.00x
🐘 Postgres Nitro 1.194s (-6.3% 🟢) 2.008s (~) 0.814s 15 1.02x
🐘 Postgres Express 1.199s (-4.9%) 2.008s (~) 0.809s 15 1.02x
💻 Local Express 1.225s (-17.7% 🟢) 2.006s (~) 0.781s 15 1.04x
🐘 Postgres Next.js (Turbopack) 1.225s 2.007s 0.781s 15 1.04x
💻 Local Next.js (Turbopack) 1.338s 2.006s 0.668s 15 1.14x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Next.js (Turbopack) 2.594s (-23.7% 🟢) 4.120s (-16.5% 🟢) 1.526s 8 1.00x
▲ Vercel Nitro 2.675s (-5.1% 🟢) 4.179s (-3.3%) 1.504s 8 1.03x
▲ Vercel Express 2.733s (-4.4%) 4.368s (-5.5% 🟢) 1.635s 7 1.05x

🔍 Observability: Next.js (Turbopack) | Nitro | Express

Promise.all with 25 concurrent steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
🐘 Postgres 🥇 Express 1.256s (-46.8% 🟢) 2.006s (-33.3% 🟢) 0.750s 15 1.00x
🐘 Postgres Nitro 1.277s (-45.7% 🟢) 2.007s (-33.3% 🟢) 0.730s 15 1.02x
🐘 Postgres Next.js (Turbopack) 1.366s 2.007s 0.641s 15 1.09x
💻 Local Nitro 1.577s (-49.8% 🟢) 2.005s (-48.4% 🟢) 0.428s 15 1.26x
💻 Local Next.js (Turbopack) 1.756s 2.149s 0.393s 14 1.40x
💻 Local Express 1.936s (-34.4% 🟢) 2.314s (-33.0% 🟢) 0.379s 13 1.54x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Nitro 3.639s (-10.2% 🟢) 5.298s (-10.5% 🟢) 1.660s 6 1.00x
▲ Vercel Express 3.640s (+0.6%) 5.245s (+2.6%) 1.604s 6 1.00x
▲ Vercel Next.js (Turbopack) 3.730s (-47.5% 🟢) 5.409s (-39.3% 🟢) 1.679s 6 1.03x

🔍 Observability: Nitro | Express | Next.js (Turbopack)

Promise.all with 50 concurrent steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
🐘 Postgres 🥇 Express 1.390s (-60.1% 🟢) 2.007s (-50.0% 🟢) 0.617s 15 1.00x
🐘 Postgres Nitro 1.396s (-59.9% 🟢) 2.009s (-49.9% 🟢) 0.613s 15 1.00x
🐘 Postgres Next.js (Turbopack) 1.741s 2.223s 0.482s 14 1.25x
💻 Local Nitro 3.627s (-56.6% 🟢) 4.134s (-54.2% 🟢) 0.508s 8 2.61x
💻 Local Next.js (Turbopack) 4.626s 5.010s 0.384s 6 3.33x
💻 Local Express 5.357s (-35.7% 🟢) 5.846s (-35.2% 🟢) 0.489s 6 3.85x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Express 5.601s (+32.1% 🔺) 7.644s (+24.8% 🔺) 2.043s 4 1.00x
▲ Vercel Nitro 5.802s (+64.6% 🔺) 7.041s (+27.2% 🔺) 1.240s 5 1.04x
▲ Vercel Next.js (Turbopack) 7.553s (-15.3% 🟢) 9.031s (-17.6% 🟢) 1.479s 4 1.35x

🔍 Observability: Express | Nitro | Next.js (Turbopack)

Promise.race with 10 concurrent steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
🐘 Postgres 🥇 Nitro 1.184s (-5.8% 🟢) 2.008s (~) 0.823s 15 1.00x
🐘 Postgres Express 1.195s (-5.0%) 2.007s (~) 0.812s 15 1.01x
🐘 Postgres Next.js (Turbopack) 1.229s 2.008s 0.779s 15 1.04x
💻 Local Next.js (Turbopack) 1.357s 2.006s 0.649s 15 1.15x
💻 Local Nitro 1.371s (-26.5% 🟢) 2.005s (-14.3% 🟢) 0.634s 15 1.16x
💻 Local Express 1.604s (-15.3% 🟢) 2.007s (-15.1% 🟢) 0.403s 15 1.35x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Express 2.489s (-3.6%) 4.265s (-1.9%) 1.775s 8 1.00x
▲ Vercel Nitro 2.529s (+2.8%) 4.097s (-1.7%) 1.568s 8 1.02x
▲ Vercel Next.js (Turbopack) 2.639s (-10.0% 🟢) 4.562s (-1.7%) 1.923s 7 1.06x

🔍 Observability: Express | Nitro | Next.js (Turbopack)

Promise.race with 25 concurrent steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
🐘 Postgres 🥇 Nitro 1.252s (-46.5% 🟢) 2.009s (-33.3% 🟢) 0.757s 15 1.00x
🐘 Postgres Express 1.271s (-45.7% 🟢) 2.008s (-33.3% 🟢) 0.737s 15 1.02x
🐘 Postgres Next.js (Turbopack) 1.375s 2.007s 0.633s 15 1.10x
💻 Local Nitro 1.661s (-45.8% 🟢) 2.006s (-48.4% 🟢) 0.344s 15 1.33x
💻 Local Next.js (Turbopack) 2.103s 2.828s 0.725s 11 1.68x
💻 Local Express 2.162s (-31.0% 🟢) 2.674s (-28.9% 🟢) 0.512s 12 1.73x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Express 3.590s (+12.5% 🔺) 5.173s (+7.9% 🔺) 1.583s 6 1.00x
▲ Vercel Next.js (Turbopack) 3.974s (+26.5% 🔺) 6.163s (+36.3% 🔺) 2.189s 5 1.11x
▲ Vercel Nitro 4.108s (+27.1% 🔺) 5.259s (+3.6%) 1.151s 6 1.14x

🔍 Observability: Express | Next.js (Turbopack) | Nitro

Promise.race with 50 concurrent steps

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
🐘 Postgres 🥇 Express 1.377s (-60.6% 🟢) 2.007s (-49.9% 🟢) 0.630s 15 1.00x
🐘 Postgres Nitro 1.412s (-59.4% 🟢) 2.008s (-49.9% 🟢) 0.596s 15 1.02x
🐘 Postgres Next.js (Turbopack) 1.685s 2.152s 0.467s 14 1.22x
💻 Local Nitro 4.417s (-51.7% 🟢) 5.012s (-50.0% 🟢) 0.594s 6 3.21x
💻 Local Next.js (Turbopack) 5.101s 5.516s 0.415s 6 3.70x
💻 Local Express 5.983s (-32.0% 🟢) 6.615s (-28.7% 🟢) 0.633s 5 4.34x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Nitro 5.071s (~) 6.643s (-2.6%) 1.571s 5 1.00x
▲ Vercel Next.js (Turbopack) 5.657s (-16.3% 🟢) 7.683s (-10.1% 🟢) 2.026s 5 1.12x
▲ Vercel Express 6.285s (-2.1%) 8.866s (+8.4% 🔺) 2.581s 4 1.24x

🔍 Observability: Nitro | Next.js (Turbopack) | Express

workflow with 10 sequential data payload steps (10KB)

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
💻 Local 🥇 Nitro 0.479s (-51.1% 🟢) 1.003s (-8.3% 🟢) 0.524s 60 1.00x
🐘 Postgres Nitro 0.563s (-31.3% 🟢) 1.006s (~) 0.443s 60 1.17x
🐘 Postgres Express 0.581s (-30.8% 🟢) 1.024s (~) 0.443s 59 1.21x
💻 Local Express 0.604s (-38.6% 🟢) 1.005s (-6.6% 🟢) 0.400s 60 1.26x
🐘 Postgres Next.js (Turbopack) 0.794s 1.006s 0.212s 60 1.66x
💻 Local Next.js (Turbopack) 0.837s 1.004s 0.167s 60 1.75x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Express 5.359s (-71.8% 🟢) 6.892s (-67.7% 🟢) 1.533s 9 1.00x
▲ Vercel Nitro 5.393s (-75.5% 🟢) 6.758s (-71.9% 🟢) 1.365s 10 1.01x
▲ Vercel Next.js (Turbopack) 5.836s (-59.8% 🟢) 7.776s (-51.7% 🟢) 1.940s 8 1.09x

🔍 Observability: Express | Nitro | Next.js (Turbopack)

workflow with 25 sequential data payload steps (10KB)

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
💻 Local 🥇 Nitro 1.187s (-60.9% 🟢) 2.007s (-46.6% 🟢) 0.820s 45 1.00x
🐘 Postgres Express 1.340s (-32.2% 🟢) 2.008s (-11.1% 🟢) 0.667s 45 1.13x
🐘 Postgres Nitro 1.347s (-30.1% 🟢) 2.008s (-4.4%) 0.661s 45 1.13x
💻 Local Express 1.525s (-49.4% 🟢) 2.006s (-44.0% 🟢) 0.481s 45 1.28x
🐘 Postgres Next.js (Turbopack) 1.890s 2.053s 0.163s 44 1.59x
💻 Local Next.js (Turbopack) 2.099s 2.765s 0.665s 33 1.77x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Express 13.580s (-60.7% 🟢) 15.250s (-58.6% 🟢) 1.670s 6 1.00x
▲ Vercel Nitro 13.788s (-65.1% 🟢) 15.454s (-62.6% 🟢) 1.666s 6 1.02x
▲ Vercel Next.js (Turbopack) 14.665s (-70.6% 🟢) 16.749s (-67.6% 🟢) 2.084s 6 1.08x

🔍 Observability: Express | Nitro | Next.js (Turbopack)

workflow with 50 sequential data payload steps (10KB)

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
💻 Local 🥇 Nitro 2.635s (-71.7% 🟢) 3.032s (-69.7% 🟢) 0.397s 40 1.00x
🐘 Postgres Nitro 2.657s (-35.2% 🟢) 3.058s (-33.6% 🟢) 0.401s 40 1.01x
🐘 Postgres Express 2.714s (-32.0% 🟢) 3.111s (-28.8% 🟢) 0.396s 39 1.03x
💻 Local Express 3.257s (-64.6% 🟢) 4.009s (-60.0% 🟢) 0.752s 30 1.24x
🐘 Postgres Next.js (Turbopack) 3.805s 4.076s 0.271s 30 1.44x
💻 Local Next.js (Turbopack) 4.210s 5.010s 0.800s 24 1.60x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Nitro 28.822s (-70.3% 🟢) 30.607s (-68.9% 🟢) 1.785s 4 1.00x
▲ Vercel Express 29.834s (-77.1% 🟢) 32.369s (-75.5% 🟢) 2.535s 4 1.04x
▲ Vercel Next.js (Turbopack) 30.887s (-71.2% 🟢) 33.106s (-69.6% 🟢) 2.219s 4 1.07x

🔍 Observability: Nitro | Express | Next.js (Turbopack)

workflow with 10 concurrent data payload steps (10KB)

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
🐘 Postgres 🥇 Nitro 0.214s (-24.5% 🟢) 1.006s (~) 0.793s 60 1.00x
🐘 Postgres Express 0.236s (-16.5% 🟢) 1.023s (+1.6%) 0.787s 59 1.10x
🐘 Postgres Next.js (Turbopack) 0.265s 1.006s 0.741s 60 1.24x
💻 Local Nitro 0.343s (-43.3% 🟢) 1.003s (-1.8%) 0.660s 60 1.61x
💻 Local Express 0.526s (-6.2% 🟢) 1.096s (+9.1% 🔺) 0.570s 55 2.46x
💻 Local Next.js (Turbopack) 0.617s 1.021s 0.404s 59 2.89x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Next.js (Turbopack) 2.163s (+7.0% 🔺) 3.805s (~) 1.641s 16 1.00x
▲ Vercel Express 2.206s (+12.9% 🔺) 4.094s (+12.5% 🔺) 1.888s 15 1.02x
▲ Vercel Nitro 2.501s (+50.5% 🔺) 3.832s (+14.4% 🔺) 1.332s 16 1.16x

🔍 Observability: Next.js (Turbopack) | Express | Nitro

workflow with 25 concurrent data payload steps (10KB)

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
🐘 Postgres 🥇 Express 0.347s (-32.0% 🟢) 1.006s (~) 0.659s 90 1.00x
🐘 Postgres Nitro 0.348s (-30.0% 🟢) 1.006s (~) 0.659s 90 1.00x
🐘 Postgres Next.js (Turbopack) 0.472s 1.006s 0.533s 90 1.36x
💻 Local Nitro 1.763s (-30.5% 🟢) 2.203s (-26.8% 🟢) 0.440s 41 5.08x
💻 Local Express 2.123s (-15.5% 🟢) 2.685s (-10.8% 🟢) 0.562s 34 6.12x
💻 Local Next.js (Turbopack) 2.234s 3.044s 0.811s 30 6.44x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Nitro 5.282s (+63.7% 🔺) 6.729s (+39.6% 🔺) 1.448s 14 1.00x
▲ Vercel Express 5.351s (+75.7% 🔺) 7.140s (+48.5% 🔺) 1.788s 13 1.01x
▲ Vercel Next.js (Turbopack) 5.440s (+53.9% 🔺) 7.072s (+36.2% 🔺) 1.633s 13 1.03x

🔍 Observability: Nitro | Express | Next.js (Turbopack)

workflow with 50 concurrent data payload steps (10KB)

💻 Local Development

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
🐘 Postgres 🥇 Express 0.664s (-18.9% 🟢) 1.006s (-1.1%) 0.342s 120 1.00x
🐘 Postgres Nitro 0.685s (-13.3% 🟢) 1.006s (~) 0.321s 120 1.03x
🐘 Postgres Next.js (Turbopack) 0.941s 1.431s 0.490s 85 1.42x
💻 Local Nitro 8.049s (-28.1% 🟢) 8.595s (-26.3% 🟢) 0.546s 14 12.12x
💻 Local Express 9.839s (-12.1% 🟢) 10.361s (-13.2% 🟢) 0.522s 12 14.81x
💻 Local Next.js (Turbopack) 10.182s 11.026s 0.844s 11 15.33x

▲ Production (Vercel)

World Framework Workflow Time Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Express 12.324s (+66.1% 🔺) 14.498s (+56.8% 🔺) 2.173s 9 1.00x
▲ Vercel Next.js (Turbopack) 14.666s (+42.0% 🔺) 16.673s (+35.7% 🔺) 2.007s 8 1.19x
▲ Vercel Nitro 15.010s (+94.4% 🔺) 16.513s (+75.7% 🔺) 1.503s 8 1.22x

🔍 Observability: Express | Next.js (Turbopack) | Nitro

Stream Benchmarks (includes TTFB metrics)
workflow with stream

💻 Local Development

World Framework Workflow Time TTFB Slurp Wall Time Overhead Samples vs Fastest
💻 Local 🥇 Nitro 1.126s (+426.9% 🔺) 2.004s (+99.5% 🔺) 0.008s (-32.8% 🟢) 2.014s (+97.7% 🔺) 0.888s 10 1.00x
🐘 Postgres Nitro 1.165s (+468.0% 🔺) 2.001s (+100.1% 🔺) 0.001s (-6.7% 🟢) 2.011s (+98.8% 🔺) 0.846s 10 1.03x
💻 Local Express 1.166s (+485.8% 🔺) 2.005s (+99.6% 🔺) 0.012s (+2.5%) 2.019s (+98.3% 🔺) 0.853s 10 1.04x
🐘 Postgres Express 1.182s (+476.5% 🔺) 1.996s (+99.9% 🔺) 0.002s (-6.3% 🟢) 2.010s (+98.7% 🔺) 0.827s 10 1.05x
💻 Local Next.js (Turbopack) 1.201s 2.003s 0.011s 2.018s 0.817s 10 1.07x
🐘 Postgres Next.js (Turbopack) 1.240s 2.002s 0.001s 2.010s 0.770s 10 1.10x

▲ Production (Vercel)

World Framework Workflow Time TTFB Slurp Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Next.js (Turbopack) 2.294s (-66.5% 🟢) 3.449s (-60.1% 🟢) 1.539s (+143.6% 🔺) 5.442s (-44.4% 🟢) 3.148s 10 1.00x
▲ Vercel Express 2.316s (-7.6% 🟢) 3.684s (-9.9% 🟢) 1.280s (+33.2% 🔺) 5.440s (-2.7%) 3.124s 10 1.01x
▲ Vercel Nitro 2.329s (-39.2% 🟢) 3.209s (-39.2% 🟢) 1.561s (+110.3% 🔺) 5.136s (-20.8% 🟢) 2.807s 10 1.01x

🔍 Observability: Next.js (Turbopack) | Express | Nitro

stream pipeline with 5 transform steps (1MB)

💻 Local Development

World Framework Workflow Time TTFB Slurp Wall Time Overhead Samples vs Fastest
🐘 Postgres 🥇 Express 1.586s (+151.8% 🔺) 2.004s (+99.1% 🔺) 0.004s (~) 2.026s (+98.0% 🔺) 0.440s 30 1.00x
🐘 Postgres Nitro 1.601s (+156.5% 🔺) 2.005s (+99.2% 🔺) 0.004s (-9.7% 🟢) 2.025s (+98.0% 🔺) 0.424s 30 1.01x
💻 Local Nitro 1.633s (+94.8% 🔺) 2.007s (+98.3% 🔺) 0.008s (-16.9% 🟢) 2.195s (+96.7% 🔺) 0.562s 28 1.03x
🐘 Postgres Next.js (Turbopack) 1.720s 2.011s 0.004s 2.026s 0.306s 30 1.08x
💻 Local Next.js (Turbopack) 1.886s 2.008s 0.010s 2.194s 0.308s 29 1.19x
💻 Local Express 2.000s (+164.2% 🔺) 2.010s (+95.3% 🔺) 0.010s (+6.7% 🔺) 2.423s (+133.0% 🔺) 0.423s 25 1.26x

▲ Production (Vercel)

World Framework Workflow Time TTFB Slurp Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Nitro 5.902s (-80.0% 🟢) 6.937s (-77.5% 🟢) 0.161s (+43.3% 🔺) 7.510s (-76.4% 🟢) 1.608s 8 1.00x
▲ Vercel Next.js (Turbopack) 6.104s (-63.9% 🟢) 7.627s (-58.2% 🟢) 0.187s (-11.4% 🟢) 8.291s (-56.2% 🟢) 2.187s 8 1.03x
▲ Vercel Express ⚠️ missing - - - - -

🔍 Observability: Nitro | Next.js (Turbopack)

10 parallel streams (1MB each)

💻 Local Development

World Framework Workflow Time TTFB Slurp Wall Time Overhead Samples vs Fastest
🐘 Postgres 🥇 Nitro 0.706s (-27.1% 🟢) 1.046s (-16.1% 🟢) 0.000s (-15.8% 🟢) 1.059s (-15.8% 🟢) 0.353s 57 1.00x
🐘 Postgres Express 0.733s (-23.7% 🟢) 1.047s (-18.1% 🟢) 0.000s (-19.3% 🟢) 1.067s (-18.3% 🟢) 0.333s 57 1.04x
🐘 Postgres Next.js (Turbopack) 0.824s 1.054s 0.000s 1.061s 0.237s 57 1.17x
💻 Local Nitro 1.165s (-4.7%) 1.979s (-2.0%) 0.001s (+480.6% 🔺) 1.981s (-2.0%) 0.816s 31 1.65x
💻 Local Express 1.406s (+14.8% 🔺) 2.013s (~) 0.000s (+30.0% 🔺) 2.016s (~) 0.610s 30 1.99x
💻 Local Next.js (Turbopack) 1.478s 2.012s 0.000s 2.015s 0.538s 30 2.09x

▲ Production (Vercel)

World Framework Workflow Time TTFB Slurp Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Next.js (Turbopack) 3.563s (-65.0% 🟢) 4.928s (-57.2% 🟢) 0.000s (NaN%) 5.517s (-54.2% 🟢) 1.954s 11 1.00x
▲ Vercel Express 3.601s (-3.7%) 5.056s (-0.9%) 0.000s (-50.0% 🟢) 5.560s (+0.5%) 1.959s 11 1.01x
▲ Vercel Nitro ⚠️ missing - - - - -

🔍 Observability: Next.js (Turbopack) | Express

fan-out fan-in 10 streams (1MB each)

💻 Local Development

World Framework Workflow Time TTFB Slurp Wall Time Overhead Samples vs Fastest
🐘 Postgres 🥇 Express 1.330s (-24.9% 🟢) 2.065s (-5.2% 🟢) 0.000s (+Infinity% 🔺) 2.085s (-5.2% 🟢) 0.755s 29 1.00x
🐘 Postgres Nitro 1.462s (-18.4% 🟢) 2.175s (+1.6%) 0.000s (+100.0% 🔺) 2.192s (+0.8%) 0.731s 28 1.10x
🐘 Postgres Next.js (Turbopack) 1.651s 2.143s 0.000s 2.165s 0.514s 28 1.24x
💻 Local Nitro 2.457s (-27.5% 🟢) 2.827s (-29.9% 🟢) 0.000s (-31.8% 🟢) 2.842s (-29.6% 🟢) 0.384s 22 1.85x
💻 Local Next.js (Turbopack) 2.958s 3.609s 0.001s 3.617s 0.659s 17 2.22x
💻 Local Express 3.102s (-10.5% 🟢) 3.901s (-3.3%) 0.000s (-68.8% 🟢) 3.904s (-3.3%) 0.802s 16 2.33x

▲ Production (Vercel)

World Framework Workflow Time TTFB Slurp Wall Time Overhead Samples vs Fastest
▲ Vercel 🥇 Nitro 5.123s (+25.1% 🔺) 6.600s (+22.8% 🔺) 0.000s (-100.0% 🟢) 6.992s (+20.7% 🔺) 1.869s 9 1.00x
▲ Vercel Express 5.822s (+26.9% 🔺) 7.693s (+27.7% 🔺) 0.002s (+Infinity% 🔺) 8.177s (+26.6% 🔺) 2.355s 8 1.14x
▲ Vercel Next.js (Turbopack) ⚠️ missing - - - - -

🔍 Observability: Nitro | Express

Summary

Fastest Framework by World

Winner determined by most benchmark wins

World 🥇 Fastest Framework Wins
💻 Local Nitro 20/21
🐘 Postgres Express 12/21
▲ Vercel Express 8/21
Fastest World by Framework

Winner determined by most benchmark wins

Framework 🥇 Fastest World Wins
Express 🐘 Postgres 17/21
Next.js (Turbopack) 🐘 Postgres 15/21
Nitro 🐘 Postgres 11/21
Column Definitions
  • Workflow Time: Runtime reported by workflow (completedAt - createdAt) - primary metric
  • TTFB: Time to First Byte - time from workflow start until first stream byte received (stream benchmarks only)
  • Slurp: Time from first byte to complete stream consumption (stream benchmarks only)
  • Wall Time: Total testbench time (trigger workflow + poll for result)
  • Overhead: Testbench overhead (Wall Time - Workflow Time)
  • Samples: Number of benchmark iterations run
  • vs Fastest: How much slower compared to the fastest configuration for this benchmark

Worlds:

  • 💻 Local: In-memory filesystem world (local development)
  • 🐘 Postgres: PostgreSQL database world (local development)
  • ▲ Vercel: Vercel production/preview deployment
  • 🌐 Turso: Community world (local development)
  • 🌐 MongoDB: Community world (local development)
  • 🌐 Redis: Community world (local development)
  • 🌐 Jazz: Community world (local development)
  • 🌐 Redis: Community world (local development)
  • 🌐 Redis + BullMQ: Community world (local development)
  • 🌐 Cloudflare: Community world (local development)
  • 🌐 MySQL: Community world (local development)
  • 🌐 Azure: Community world (local development)
  • 🌐 NATS JetStream: Community world (local development)
  • 🌐 Upstash: Community world (local development)

📋 View full workflow run

⚠️ Community world benchmarks failed (non-blocking):

  • Community Worlds: failure

Check the workflow run for details.

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github-actions Bot commented May 30, 2026 •
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🧪 E2E Test Results

✅ All tests passed

Summary

Passed Failed Skipped Total
✅ ▲ Vercel Production 1266 0 219 1485
✅ 💻 Local Development 1671 0 219 1890
✅ 📦 Local Production 1671 0 219 1890
✅ 🐘 Local Postgres 1671 0 219 1890
✅ 🪟 Windows 135 0 0 135
✅ 📋 Other 769 0 176 945
Total 7183 0 1052 8235

Details by Category

✅ ▲ Vercel Production
App Passed Failed Skipped
✅ astro 109 0 26
✅ example 109 0 26
✅ express 109 0 26
✅ fastify 109 0 26
✅ hono 109 0 26
✅ nextjs-turbopack 133 0 2
✅ nextjs-webpack 133 0 2
✅ nitro 109 0 26
✅ nuxt 109 0 26
✅ sveltekit 128 0 7
✅ vite 109 0 26
✅ 💻 Local Development
App Passed Failed Skipped
✅ astro-stable 110 0 25
✅ express-stable 110 0 25
✅ fastify-stable 110 0 25
✅ hono-stable 110 0 25
✅ nextjs-turbopack-canary 116 0 19
✅ nextjs-turbopack-stable-lazy-discovery-disabled 135 0 0
✅ nextjs-turbopack-stable-lazy-discovery-enabled 135 0 0
✅ nextjs-webpack-canary 116 0 19
✅ nextjs-webpack-stable-lazy-discovery-disabled 135 0 0
✅ nextjs-webpack-stable-lazy-discovery-enabled 135 0 0
✅ nitro-stable 110 0 25
✅ nuxt-stable 110 0 25
✅ sveltekit-stable 129 0 6
✅ vite-stable 110 0 25
✅ 📦 Local Production
App Passed Failed Skipped
✅ astro-stable 110 0 25
✅ express-stable 110 0 25
✅ fastify-stable 110 0 25
✅ hono-stable 110 0 25
✅ nextjs-turbopack-canary 116 0 19
✅ nextjs-turbopack-stable-lazy-discovery-disabled 135 0 0
✅ nextjs-turbopack-stable-lazy-discovery-enabled 135 0 0
✅ nextjs-webpack-canary 116 0 19
✅ nextjs-webpack-stable-lazy-discovery-disabled 135 0 0
✅ nextjs-webpack-stable-lazy-discovery-enabled 135 0 0
✅ nitro-stable 110 0 25
✅ nuxt-stable 110 0 25
✅ sveltekit-stable 129 0 6
✅ vite-stable 110 0 25
✅ 🐘 Local Postgres
App Passed Failed Skipped
✅ astro-stable 110 0 25
✅ express-stable 110 0 25
✅ fastify-stable 110 0 25
✅ hono-stable 110 0 25
✅ nextjs-turbopack-canary 116 0 19
✅ nextjs-turbopack-stable-lazy-discovery-disabled 135 0 0
✅ nextjs-turbopack-stable-lazy-discovery-enabled 135 0 0
✅ nextjs-webpack-canary 116 0 19
✅ nextjs-webpack-stable-lazy-discovery-disabled 135 0 0
✅ nextjs-webpack-stable-lazy-discovery-enabled 135 0 0
✅ nitro-stable 110 0 25
✅ nuxt-stable 110 0 25
✅ sveltekit-stable 129 0 6
✅ vite-stable 110 0 25
✅ 🪟 Windows
App Passed Failed Skipped
✅ nextjs-turbopack 135 0 0
✅ 📋 Other
App Passed Failed Skipped
✅ e2e-local-dev-nest-stable 110 0 25
✅ e2e-local-dev-tanstack-start- 110 0 25
✅ e2e-local-postgres-nest-stable 110 0 25
✅ e2e-local-postgres-tanstack-start- 110 0 25
✅ e2e-local-prod-nest-stable 110 0 25
✅ e2e-local-prod-tanstack-start- 110 0 25
✅ e2e-vercel-prod-tanstack-start 109 0 26

📋 View full workflow run

@VaguelySerious VaguelySerious marked this pull request as ready for review May 30, 2026 08:08
@VaguelySerious VaguelySerious requested a review from a team as a code owner May 30, 2026 08:08
karthikscale3
karthikscale3 approved these changes May 30, 2026
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Approve. ✅ Minimal, well-scoped, correctly targeted, and empirically verified.

Verification

  • Target is correct. build.js runs cargo build-wasm32 --release → wasm32-unknown-unknown, which is exactly the section the flag is added to. The unused build-wasip1 alias is irrelevant here.
  • It fixes the reported failure. On this PR Unit Tests (windows-latest) passes (8m24s) and E2E Windows Tests passes (19m17s). The only red checks are Benchmark Community World (Redis, Redis+BullMQ, MongoDB) — unrelated benchmark/infra jobs, two of which ran a full hour before failing (timeouts, not linkage).
  • TOML/cargo syntax is valid and correctly placed for per-target rustflags; the empty changeset (---\n---) is exactly what pnpm changeset --empty emits to pass the gate without a release.

Non-blocking notes

  1. --allow-undefined is broad — it lets all undefined symbols become wasm imports, not just SWC's three host functions, so a future genuinely-missing symbol would fail at plugin-load instead of build time. Tighter options are --import-undefined or --allow-undefined-file=<allowlist>, but --allow-undefined is the conventional choice in the SWC plugin ecosystem.
  2. Applies on all platforms, which is preferable — consistent build behavior, and the imports are host-provided everywhere.
  3. RUSTFLAGS precedence caveat: target.<triple>.rustflags in .cargo/config.toml is ignored if a global RUSTFLAGS env var is set (env wins, no merge). Worth a quick confirm CI doesn't export one for the plugin build — the green Windows run suggests it's fine today.

Nice touch documenting the why in the comment for a non-obvious linker flag. The failing benchmark checks are unrelated and shouldn't gate this.

@TooTallNate TooTallNate merged commit 5dabbee into main May 30, 2026
187 of 193 checks passed
@TooTallNate TooTallNate deleted the peter/fix-swc-plugin-windows-link branch May 30, 2026 21:57
github-actions Bot added a commit that referenced this pull request May 30, 2026
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fix(swc-plugin): allow wasm host imports during link (#2174)
4edd274 
Signed-off-by: Peter Wielander <mittgfu@gmail.com>
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github-actions Bot commented May 30, 2026

Backport PR opened against stable: #2182. (backport job run)

@github-actions github-actions Bot mentioned this pull request May 30, 2026
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TooTallNate pushed a commit that referenced this pull request May 30, 2026
@github-actions
fix(swc-plugin): allow wasm host imports during link (#2174) (#2182)
f0b1628 
Signed-off-by: Peter Wielander <mittgfu@gmail.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
@TooTallNate TooTallNate mentioned this pull request May 31, 2026
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@VaguelySerious @karthikscale3 @TooTallNate