fix(js): restore static wasm URL for bundler asset detection - #559
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WalkthroughThe Vite configuration replaces ChangesWASM URL bundling
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The build change restores bundler detection but currently applies browser-specific rewriting to non-browser targets and removes the documented manual wasm URL override, which can break standalone, Node, or custom deployments. Merge should wait until target scoping and override preservation are corrected. Possibly related PRs
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In `@packages/js/vite.config.js`:
- Line 154: Restrict wasmUrlPlugin registration in the plugins configuration to
TARGET === "browser", so its transform and replacement hooks cannot affect
standalone or Node builds; keep copyWasmPlugin() available as currently
configured.
- Around line 127-131: Update the mangledRe replacement in the bundle-processing
loop so restored code still evaluates globalThis.__IMG2NUM_WASM_NAME__ and uses
new URL("img2num.wasm", import.meta.url) as the fallback when no override is
set; do not replace the expression with an unconditional LITERAL.
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**/*.{js,ts,jsx,tsx}
📄 CodeRabbit inference engine (.editorconfig)
**/*.{js,ts,jsx,tsx}: Use 2-space indentation for JavaScript and TypeScript files
Maintain 200 character maximum line length for JavaScript/TypeScript files
Files:
packages/js/vite.config.js
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Planned commit message: fix: restore static wasm URL for bundler asset detection
The browser ES build published in 0.4.0 shipped a mangled wasm URL
expression, `new URL(globalThis.__IMG2NUM_WASM_NAME__ ??= "img2num.wasm",
import.meta.url)`, introduced to defeat Vite lib-mode data-URL inlining.
The same non-static form also defeats asset detection in consumers'
bundlers (Vite, webpack 5, Rollup, Parcel), which require the exact
literal `new URL("<file>", import.meta.url)` to emit and rewrite the
wasm. Bundled consumers therefore resolved the URL against their own
chunk path at runtime and hit a 404, aborting wasm instantiation.
Replace preventWasmInlining with a two-phase wasmUrlPlugin:
- transform: mangle the literal into a non-static `||` sentinel so
lib-mode asset analysis cannot inline it. The sentinel must stay
within build.target (es2020) syntax; `??=` is ES2021 and gets
transpiled before generateBundle, silently breaking the round-trip.
- generateBundle: restore a bundler-detectable form via a tolerant
regex. The restored form is a parenthesized ternary whose false
branch is the exact literal (bundlers match the expression node, so
detection is unaffected) and whose true branch preserves
`globalThis.__IMG2NUM_WASM_NAME__` as a runtime override.
- guard: fail the browser build loudly if the literal is missing from
the output, preventing this regression class from publishing again.
The plugin is gated to the browser target: node glue resolves via
__dirname and standalone glue via document.currentScript, so the URL
pattern only exists in the ES6 web glue. Standalone IIFE/UMD
(SINGLE_FILE=1, embedded wasm) and node builds were never affected.
Verified: literal and override both present in dist/browser/img2num.js;
react-js example emits a hashed img2num-*.wasm with zero app-side
changes; esm/iife/umd examples and node outputs unchanged.
Fixes bundled-consumer wasm 404 in 0.4.0.
chore: add CHANGELOG.md to the package files whitelist
npm only force-includes package.json/README/LICENSE, so release-please's
changelog was absent from published tarballs. |
Address CodeRabbit review on the wasm URL restore:
- Restore a parenthesized ternary instead of the bare literal:
`(globalThis.__IMG2NUM_WASM_NAME__ ? new URL(<override>, ...) :
new URL("img2num.wasm", import.meta.url))`. The previous restore
erased the override from the emitted chunk, making the documented
manual escape hatch dead code. Consumer bundlers match the literal
expression node, so detection is unaffected by the ternary branch.
- Early-return wasmUrlPlugin for non-browser targets. Both hooks were
already no-ops there (node glue resolves via __dirname, standalone
glue via document.currentScript; neither contains the URL pattern),
but the gate makes that structural rather than a coincidence of glue
contents. Replaces the per-hook T.copyWasm checks and the guard's
inner TARGET condition.
- Replace em-dashes with ASCII in comments/error text (encoding got
corrupted to CP437 mojibake in the container).
Verified: literal and override both present in dist/browser/img2num.js;
react-js example still emits hashed wasm; standalone/node outputs
byte-identical.
1 participant
Summary
Fixes a regression in
0.4.0where the published browser ES build (dist/browser/img2num.js) ships a wasm URL that downstream bundlers cannot statically analyze. Any consumer bundlingimg2numwith Vite, webpack 5, Rollup, or Parcel gets a runtime 404 (GET .../assets/img2num.wasm) followed byRuntimeError: Aborted(both async and sync fetching of the wasm failed).Root cause
Vite's lib mode inlines
new URL("img2num.wasm", import.meta.url)as a data URL (ignoringassetsInlineLimit), so the build previously mangled the expression into a non-static form to defeat that analysis:That mangled form shipped in the published output. The same property that defeats our lib-mode inlining also blinds consumers' bundlers — the exact literal
new URL("<file>", import.meta.url)is the pattern they rely on to detect, emit, hash, and rewrite the wasm asset in app builds. With it gone, the URL resolves at runtime against the consumer's chunk path, where no wasm exists.The standalone IIFE/UMD builds are unaffected (
SINGLE_FILE=1, wasm embedded), which is why the CDN<script>path kept working while bundled consumers broke. Node builds resolve via the glue's__dirnamepath and are also unaffected.Fix
preventWasmInliningis replaced by a two-phasewasmUrlPlugin:transform— mangle the literal intonew URL(globalThis.__IMG2NUM_WASM_NAME__ || "img2num.wasm", import.meta.url)so lib-mode asset analysis can't inline it.generateBundle— after analysis is complete, restore the exact literal in the emitted chunk so consumers' bundlers can see it.Notes on the implementation:
||instead of??=. Logical assignment is ES2021; withbuild.target: "es2020"it gets transpiled beforegenerateBundleruns, the restore match fails silently, and the broken expression ships again. This constraint is documented inline.0.4.0.globalThis.__IMG2NUM_WASM_NAME__still works as a manual URL override for exotic setups.Result for consumers
Bundling
img2numis now zero-config: the bundler detects the literal, emits the wasm into the app's assets with a hash, and rewrites the URL. No?urlimports, no globals, no entry-file ordering requirements. Plain<script type="module">consumers copyingimg2num.js+img2num.wasmside by side continue to get correct relative resolution.Verification
grep -c 'new URL("img2num.wasm", import.meta.url)' packages/js/dist/browser/img2num.js→1(literal present in published output; was0on0.4.0).example-apps/react-jswith no app-side changes: build now emitsassets/img2num-MjQHcrHS.wasm(550 kB) and the vectorization flow works in the served docs build.esmexample unchanged (siblingimg2num.wasm, relative resolution);iife/umdexamples unchanged (embedded wasm, nothing to fetch); node builds unchanged.Follow-up (post-merge)