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fix(build): load the DNT shims lazily so a global Deno install can render - #3681
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A globally installed CLI returned 500 on every request, on any project
including a fresh scaffold:
deno install -gArf npm:veryfront -> 500 "Loading unprepared module"
npm install -g veryfront -> 200
The error named an http bundle that was present on disk, and its hint
blamed a Redis TTL on a local dev run with no Redis, so the message
pointed away from the cause in two directions at once.
Cause: `deno install -g` writes its own config next to the shim,
`{"workspace": [], "nodeModulesDir": "manual"}` — Deno generates the same
file for any global npm install, `npm:cowsay` included, so it is not
something this package controls. DNT imports `@deno/shim-deno` and
`@deno/shim-crypto` statically; the esm transform rewrites both bare
specifiers into absolute file:// bundles, and Deno will not prepare such
a graph node when node_modules is unmanaged.
Both shims exist only for runtimes lacking the corresponding global:
`patchDntDenoShim` already documented that the Deno fallback is "for Node
and Bun", and Web Crypto is a global on Deno, Node 19+ and Bun alike. So
the imports are now lazy, matching what the code already said it wanted.
Fixing one shim is not enough — a single remaining static import keeps the
graph unpreparable, which is why the Deno-only change measured identically
to no change at all.
Verified end to end against a built and packed tarball, same config and
project on both arms:
published 0.1.1232 -> http=500 unprepared=1 marker=0
this build -> http=200 unprepared=0 marker=1
Cross-runtime, same build:
Deno + global-install config 500 -> 200
Deno plain 200 -> 200
Node 25.2.1 200 -> 200
Bun 1.3.6 500 -> 500
Bun fails before and after on an unrelated defect,
"undefined is not an object (evaluating 'adapter.fs')", not the module
graph. That is untouched here and needs its own fix.
Wired into the extension packages too: they emit their own _dnt.shims.js
and would otherwise keep the static imports.
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📝 WalkthroughWalkthroughThe DNT build helpers now normalize generated crypto shims alongside Deno shims. The normalization prefers native runtime globals and dynamically loads fallback shims. Tests cover patching, runtime behavior, idempotence, malformed output, and missing files. ChangesDNT crypto shim support
Estimated code review effort: 3 (Moderate) | ~20 minutes Mergeability Score: 🔵 Low · up to The PR lazily loads compatibility shims so globally installed Deno CLIs can render successfully. It is mergeable with explicit owner awareness that the extension-build path still lacks a test for default fail-closed behavior when the expected shim shape is absent; this is a bounded validation risk rather than a demonstrated production failure. Sequence Diagram(s)sequenceDiagram
participant BuildScript
participant patchDntCryptoShim
participant GeneratedCryptoShim
participant RuntimeGlobals
BuildScript->>patchDntCryptoShim: patch generated crypto shim
patchDntCryptoShim->>GeneratedCryptoShim: replace static fallback with lazy loading
GeneratedCryptoShim->>RuntimeGlobals: check native crypto global
GeneratedCryptoShim-->>GeneratedCryptoShim: dynamically load shim fallback when unavailable
Possibly related PRs
Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Inline comments:
In `@scripts/build/dnt-polyfill.test.ts`:
- Around line 341-354: Update the assertRejects call for patchDntCryptoShim in
the “fails closed when required DNT crypto output changes” test to use the
default options by removing required: true, so it verifies the optional
fail-closed behavior exercised by the extension build.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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📒 Files selected for processing (4)
scripts/build/build-npm-dnt.tsscripts/build/build-npm-extension-packages.tsscripts/build/dnt-polyfill.test.tsscripts/build/dnt-polyfill.ts
build-npm-extension-packages.ts calls patchDntCryptoShim without `required`, and the existing case passed `required: true`, so the branch that actually guards the extension packages was untested.
A globally installed CLI returns 500 on every request, on any project including a fresh
npm create veryfrontscaffold.Found by walking the documented install page as a new developer would.
Why it was hard to see
The error names an http bundle that is present on disk — all 171 of them were — and its hint blames
Bundle may have expired from Redis (24h TTL)on a local dev run with no Redis anywhere. The message points away from the cause in two directions at once.Cause
deno install -gwrites its own config beside the shim:{ "workspace": [], "nodeModulesDir": "manual" }Deno generates that file for any global npm install —
npm:cowsayproduces a byte-identical one — so it isn't something this package controls or can opt out of.DNT imports
@deno/shim-denoand@deno/shim-cryptostatically. The esm transform rewrites both bare specifiers into absolutefile://bundles, and Deno will not prepare such a graph node whennode_modulesis unmanaged.Both shims exist only for runtimes lacking the corresponding global.
patchDntDenoShimalready documented its fallback as being "for Node and Bun", and Web Crypto is a global on Deno, Node 19+ and Bun alike. The imports are now lazy, which is what the code already said it wanted.Fixing one shim is not enough. A single remaining static import keeps the graph unpreparable — the Deno-only change measured identically to no change at all, which is how the crypto half surfaced.
Verification
Built and packed a tarball, then ran both arms with the same config and the same project shape:
0.1.1232Cross-runtime, same build:
Bun fails identically before and after, on an unrelated defect —
undefined is not an object (evaluating 'adapter.fs'), not the module graph. Untouched here; it needs its own fix and I did not want to conflate the two.Also gated:
deno task fmt:check(4806 files),dnt-polyfillanddnt-meta-property-safetysuites,deno lint.Tests
patchDntCryptoShimmirrors the Deno patcher — same idempotency marker, same fail-closed check if DNT's output shape changes. New cases cover lazy-not-static for both shims, native preference, fallback retention when the global is absent, idempotency, and fail-closed. A separate case pins that the Deno patcher does not silently take over the crypto shim.Wired into
build-npm-extension-packages.tsas well — extensions emit their own_dnt.shims.jsand would otherwise keep the static imports.Note on scope
This does not re-document the Deno global install; the docs currently list it and it has never worked. Worth a follow-up once this ships, along with a startup guard so a future regression here fails fast with an instruction instead of a per-request 500.
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