Troubleshooting

Cannot find module 'next-bun-compile'

Next resolves adapterPath from its own package location. In monorepos or linked workspaces, resolve from the app dir instead:

import { createRequire } from "node:module";
const req = createRequire(process.cwd() + "/");

const nextConfig: NextConfig = {
  adapterPath: req.resolve("next-bun-compile"),
};

adapter outputs not found for this build

The compile pipeline ran without the adapter (e.g. against a stale .next). Build through the adapter — adapterPath in next.config or NEXT_ADAPTER_PATH=next-bun-compile next build — and make sure nothing removed .next/nbc-adapter-outputs.json between the build and the compile.

Failed to load external module pino-...: Cannot find package

Some packages (pino, pino-pretty) use dynamic require() calls internally that Turbopack can’t statically resolve. They get externalized with a mangled name that doesn’t exist in your node_modules.

Fix. Force them through the bundler with transpilePackages:

const nextConfig: NextConfig = {
  adapterPath: "next-bun-compile",
  transpilePackages: ["pino", "pino-pretty"],
};

See transpilePackages guide.

Could not load the "sharp" module using the linux-x64 runtime

Sharp loaded but couldn’t dlopen its native binding. This is sharp’s own error after exhausting its load paths — it’s a runtime environment issue, not a next-bun-compile issue.

Fix. Use a runner image with the libs sharp’s prebuilt expects:

• gcr.io/distroless/cc-debian12:nonroot — has libstdc++ (the cc variant). The plain base variant lacks libstdc++ and sharp won’t load.
• For text rendering (watermarks): also need fontconfig + a font face. Full recipe in Distroless + sharp.

Fontconfig error: Cannot load default config file

libvips (sharp’s image engine) needs fontconfig + actual font files to render text. Distroless images don’t include either.

Fix. Copy them from the builder. See the recipe section in Distroless + sharp.

Binary boots, then 500 on first request

Often a missing env var your app needs at runtime — check what’s required and ensure the deploy sets them. Common cases:

• DATABASE_URL or similar (no value → driver crashes on first use)
• Stripe / OAuth secrets your code expects

Diagnostic. Set NEXT_BUN_COMPILE_DEBUG=1 and re-run; the log will show every resolver-hook decision so you can rule out a resolution failure.

“Cannot find package ‘X-abc123…’” with a 16-char hex suffix

A turbopack-mangled alias the resolver couldn’t redirect. The build-time validator should have warned about this — check the build log for:

next-bun-compile: ⚠ N of M turbopack alias reference(s) won't resolve at runtime:
  ✗ X-abc123def456... → X

Fix. The canonical package isn’t in the assembled output tree. Either:

• Add it as a dependency
• Or add it to transpilePackages so it’s bundled into the chunks instead of externalized

Binary can’t write next to itself (read-only filesystem)

The binary extracts runtime files beside itself by default. On read-only root filesystems (Kubernetes readOnlyRootFilesystem, read-only containers), point extraction at writable tmpfs:

NBC_RUNTIME_DIR=/tmp/app ./server

Want to see what’s happening at runtime?

NEXT_BUN_COMPILE_DEBUG=1 ./server

Logs every resolver-hook decision with parent-file context. See Debug mode for output examples and how to read them.

Still stuck?

Open an issue with:

1. The error output
2. NEXT_BUN_COMPILE_DEBUG=1 log of the failing request (if it happens at runtime)
3. Your next.config.ts
4. A list of native deps in your package.json

Open an issue →