feat(pdf): own Typst wasm compiler (@blocknote/xl-typst-compiler), replacing typst.ts - #3020
feat(pdf): own Typst wasm compiler (@blocknote/xl-typst-compiler), replacing typst.ts#3020YousefED wants to merge 12 commits into
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…placing typst.ts Compiles the official typst crates to wasm behind a minimal TypeScript API and moves the whole PDF pipeline onto it: native, validated PDF/UA-1 (tryDeclarePdfUA with typed violations), compile failures as values (compileErrors/compileWarnings), no CDN or network access anywhere, no page-level compiler singleton, and no @myriaddreamin/* or @cantoo/pdf-lib runtime dependencies. The wasm builds from rust/ via a self-provisioning build step (scripts/ensure-wasm.mjs) that covers CI and Vercel.
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📝 WalkthroughWalkthroughThe pull request adds a workspace Typst WebAssembly compiler, integrates native PDF/UA compilation into PDF export, updates Typst metadata behavior, migrates examples and tests, and changes CI to build and distribute compiler artifacts separately. ChangesTypst WASM compiler
Estimated code review effort: 5 (Critical) | ~120 minutes Merge Risk: 🟡 Moderate · up to The PR changes PDF compilation and build/test behavior, but the browser PDF tests currently lack the font inputs needed to reach their intended assertions, and several smaller integration issues can produce incorrect language metadata, misleading PDF/UA status, or weaker CI/package-install safeguards. These should be fixed or explicitly accepted before merge. Poem
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Description checkExplanation The description provides detailed coverage of the feature, rationale, changes, impact, testing, status, and known limitations. It does not use every template heading or include a separate screenshots section, but it is sufficiently complete and directly related to the pull request. Full details: Docstring CoverageExplanation Docstring coverage is 41.46% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 41 functions across 25 files. (25 skipped: 25 unsupported.) ✨ Finishing Touches 💡 2📝 Generate docstrings 💡
🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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GitHub's ubuntu-24.04 images no longer ship Rust, so ensure-wasm now bootstraps rustup on CI like it does on Vercel (dev machines still get instructions instead of an install). PDFExporter.toPDF replaces toBytes/toBlob - one method, one result union, with the success branch carrying the PDF as both bytes and a Blob - mirroring toTypst and the other exporters' to<Format> naming.
…DF options Fonts (bytes, value-or-promise) and the compiler wasm move to the PDFExporter constructor - names and bytes side by side, matching how the other exporters put all configuration in the constructor - while toPDF takes a single per-export bag of document facts (plus tryDeclarePdfUA, assets, creationTimestamp), like every other exporter's export method. Also: exported spreadable default-font loaders (replacing the short-lived extraFonts), lazy result Blob, a font-name/file sync invariant test, the lang requirement failing fast, PdfExporterOptions as the full options shape with Partial at the constructor, and a leaner e2e docker context (rust/target excluded).
…tside the e2e container wasm-pack now runs with the crate directory as cwd so rustup discovers rust-toolchain.toml (a bootstrapped rustup with no default toolchain found nothing to run - masked locally by an existing default). The e2e shards can't build the wasm at all (the Playwright container has no C toolchain for proc-macros), so a bare-runner job builds it once and shares pkg/dist/types as an artifact.
Simple-first flow matching the DOCX template: PDF/UA confined to its own section, CDN/offline said once, internals cut, fonts split into short sections, custom mappings owned by the Typst page (the base layer never points up; the PDF page keeps its own option surfaces explicit). Typst page gains its own Customizing/assets/math-diagram/options sections; math's export section renamed Typst / PDF. DEFAULT_FONT_FAMILY / DEFAULT_MONO_FONT_FAMILY are exported so fallback lists need no hardcoded names.
… and prose-style rules from the PDF page review
…builds Adds the four typst-pdf-page chromium baselines (visually verified, pixel-exact via pdf.js rasterization) and gives the visual test cold-start headroom on shared runners. The e2e image install no longer re-verifies minimumReleaseAge (2000+ live registry checks - the frozen lockfile was already policy-verified by the install that produced it and by CI) and caches the pnpm store/metadata across rebuilds, taking the step from 70+ flaky minutes to ~4 (sub-minute warm). The pkg-pr-new soft release excludes xl-typst-compiler: its ~25MB wasm exceeds the service's non-whitelisted upload limit.
@blocknote/ariakit
@blocknote/code-block
@blocknote/core
@blocknote/diagram-block
@blocknote/mantine
@blocknote/math-block
@blocknote/react
@blocknote/server-util
@blocknote/shadcn
@blocknote/xl-ai
@blocknote/xl-docx-exporter
@blocknote/xl-email-exporter
@blocknote/xl-multi-column
@blocknote/xl-odt-exporter
@blocknote/xl-pdf-exporter
@blocknote/xl-typst-exporter
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In @.github/workflows/build.yml:
- Around line 59-64: Replace the unquoted ls/grep command substitution in the
pkg-pr-new publish step with a quoted package-directory array, excluding
xl-typst-compiler while preserving each package path as a single argument; pass
that array safely to pkg-pr-new publish.
In `@docs/app/demo/_components/DemoEditor.tsx`:
- Around line 348-351: Update the exporter.toPDF call in DemoEditor so it does
not unconditionally set lang to "en"; use the document’s selected language when
available, or disable PDF/UA declaration with tryDeclarePdfUA: false when the
language is unknown.
In `@examples/05-interoperability/11-converting-blocks-to-pdf-ua/src/App.tsx`:
- Around line 92-101: Update the export status handling in the flow around
result.pdfUA.declared so nonconforming exports receive a distinct nonconforming
status instead of the existing ready status. Preserve the current ready status
only for declared PDF/UA-1 results, while continuing to create the PDF URL for
both outcomes.
In `@packages/xl-pdf-exporter/src/pdfua/compileTypst.browser.test.ts`:
- Around line 16-18: Add valid font bytes to the OPTIONS object used by
compileTypstToPdf in the browser compilation tests, alongside the wasm URL.
Ensure the supplied font data supports the text compiled by these tests so they
proceed to the browser and PDF assertions instead of returning compile-failed.
In `@shared/util/typstTestUtil.ts`:
- Around line 69-79: Update the compiler selection condition around
TypstCompiler.create so any defined options.fontBlobs value, including an empty
array, uses the custom-font branch; only an undefined fontBlobs should reuse the
defaultCompiler with defaultFontBlobs().
In `@tests/Dockerfile`:
- Around line 51-60: Update the pnpm install command in the Dockerfile to remove
the --config.minimumReleaseAge=0 override, preserving the workspace-configured
minimumReleaseAge policy during the frozen-lockfile installation.
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⛔ Files ignored due to path filters (15)
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📒 Files selected for processing (58)
.claude/skills/docs-skill/SKILL.md.dockerignore.github/workflows/build.yml.github/workflows/fresh-install-tests.yml.github/workflows/publish.yamldocs/app/demo/_components/DemoEditor.tsxdocs/components/typstCompilerWasmUrl.tsdocs/components/typstRendererStub.tsdocs/content/docs/features/blocks/math.mdxdocs/content/docs/features/export/pdf.mdxdocs/content/docs/features/export/typst.mdxdocs/next.config.tsdocs/package.jsonexamples/05-interoperability/11-converting-blocks-to-pdf-ua/.bnexample.jsonexamples/05-interoperability/11-converting-blocks-to-pdf-ua/package.jsonexamples/05-interoperability/11-converting-blocks-to-pdf-ua/src/App.tsxpackages/diagram-block/package.jsonpackages/math-block/package.jsonpackages/xl-pdf-exporter/package.jsonpackages/xl-pdf-exporter/src/index.tspackages/xl-pdf-exporter/src/pdfExporter.test.tspackages/xl-pdf-exporter/src/pdfExporter.tspackages/xl-pdf-exporter/src/pdfua/compileBrowser.browser.test.tspackages/xl-pdf-exporter/src/pdfua/compileBrowser.tspackages/xl-pdf-exporter/src/pdfua/compileTypst.browser.test.tspackages/xl-pdf-exporter/src/pdfua/compileTypst.tspackages/xl-pdf-exporter/src/pdfua/defaultFonts.tspackages/xl-pdf-exporter/src/pdfua/pdfua.test.tspackages/xl-pdf-exporter/src/pdfua/postProcess.test.tspackages/xl-pdf-exporter/src/pdfua/postProcess.tspackages/xl-pdf-exporter/vite.config.tspackages/xl-typst-compiler/.gitignorepackages/xl-typst-compiler/README.mdpackages/xl-typst-compiler/package.jsonpackages/xl-typst-compiler/rust/Cargo.tomlpackages/xl-typst-compiler/rust/rust-toolchain.tomlpackages/xl-typst-compiler/rust/src/lib.rspackages/xl-typst-compiler/scripts/ensure-wasm.mjspackages/xl-typst-compiler/src/index.tspackages/xl-typst-compiler/src/typstCompiler.test.tspackages/xl-typst-compiler/src/typstCompiler.tspackages/xl-typst-compiler/tsconfig.jsonpackages/xl-typst-compiler/vite.config.tspackages/xl-typst-exporter/package.jsonpackages/xl-typst-exporter/src/typstExporter.test.tspackages/xl-typst-exporter/src/typstExporter.tsplayground/package.jsonplayground/src/examples.gen.tsxpnpm-workspace.yamlshared/package.jsonshared/util/binaryFileSnapshotUtil.tsshared/util/typstTestUtil.tstests/Dockerfiletests/docker-run.shtests/package.jsontests/scripts/install-pdf-tooling.shtests/src/end-to-end/exporters/exporterImages.test.tsxtests/vite.config.browser.ts
💤 Files with no reviewable changes (8)
- docs/components/typstRendererStub.ts
- packages/xl-pdf-exporter/src/pdfua/postProcess.test.ts
- packages/xl-pdf-exporter/src/pdfua/postProcess.ts
- packages/xl-pdf-exporter/src/pdfua/compileBrowser.browser.test.ts
- .github/workflows/fresh-install-tests.yml
- shared/util/binaryFileSnapshotUtil.ts
- tests/scripts/install-pdf-tooling.sh
- packages/xl-pdf-exporter/src/pdfua/compileBrowser.ts
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… compiler, workflow quoting) - the pdf-ua example shows a distinct status when the export is tagged but unclaimed, instead of displaying the UA-1 checkmark for a nonconforming document - compileTypstForTesting treats an explicit fontBlobs: [] as a font-less compiler rather than falling through to the bundled defaults - the pkg-pr-new publish line builds a quoted package array (SC2010/SC2046)
Replaces
@myriaddreamin/typst.tswith our own wasm binding over the official typst crates (0.15.1, crates.io — no fork):@blocknote/xl-typst-compiler, ~350 lines of Rust + TypeScript. Motivation: typst.ts is a single-maintainer project compiled against a fork of typst, and its release freeze blocked native PDF-standards support in the browser (the wasm-side feature merged upstream four days after the last published rc).What the new package is
World(main source + asset map,.typassets importable), fonts supplied as bytes per instance — no page-level singleton (instance creation incl. parsing the 8 default fonts: ~6ms; typst's caches are module-global, so fresh instances compile warm at ~7-9ms; full document cold compile: ~2min wasm build, 242ms first compile, 7ms warm).pdfStandard: "ua-1"makes typst/krilla validate conformance during the compile and refuse to emit a nonconforming PDF — a successful compile is the conformance statement.API changes (xl-pdf-exporter)
toPDF(blocks, options?)replacestoBytes/toBlob— named like its siblings (toTypst,toODTDocument, …) and taking the family-consistent single per-export bag: document facts (title,lang,paper,header, …) plustryDeclarePdfUA, extraassets, andcreationTimestamp. The result union is{ bytes, blob, pdfUA, compileWarnings }or{ error: "compile-failed", compileErrors, compileWarnings }— theblobis a memoized lazy getter (constructing a Blob copies the bytes, so results that only usebytesnever pay for it).PdfExporterOptions = TypstExporterOptions & { wasm?, fonts, emojiFont }(full shape; the constructor takes aPartialand fills defaults, mirroring the base). Family names and font bytes now sit side by side;fonts/emojiFontaccept promises so lazy loading fits the sync constructor. The bundled defaults are exported (loadDefaultBodyFonts/loadDefaultEmojiFont) so extending is a spread, e.g. CJK:fonts: loadDefaultBodyFonts().then((f) => [...f, notoSansSC])withfontFamily: ["Inter 18pt", "Noto Sans SC"].tryDeclarePdfUA(defaulttrue— safe because the claim is compile-validated and can never be false): conforming documents get thepdfuaidclaim, nonconforming ones re-export tagged-but-unclaimed with Typst's violations inpdfUA. Declaring requireslangand throws without it (a caller-args error, failing fast): Typst always writes/Lang, defaulting to English — verified, it cannot be omitted upstream — and a wrong language declaration is an accessibility defect no validator can catch.TypstExporterno longer fabricates title/lang/author defaults.compileErrors/compileWarnings) is the severity; the wasm returns one uniform never-thrown payload with an explicit output-xor-errors invariant check.compileWarnings, so renaming a default family or swapping a bundled font file fails CI regardless of which side drifted.Build & infra
pkg/(wasm + glue) is a gitignored build output. The package's build task self-provisions viascripts/ensure-wasm.mjs: content-hash skip when fresh (~0s), builds via the lockfile-pinnedwasm-packdevDep otherwise; toolchain pinned inrust/rust-toolchain.toml. On CI and Vercel it bootstraps rustup automatically (GitHub's ubuntu-24.04 images ship no Rust); on Vercel the cargo caches live undernode_modules/.cache(persisted), so only the first build on a fresh cache pays the ~2-15min compile. Local cold compile: 1m52s; warm/unchanged: ~2s..dockerignoreexcludesrust/target(1.3GB) from the e2e image context.shared/util/typstTestUtil.ts) run the same wasm in Node —@myriaddreamin/typst-ts-node-compileris gone, and test fonts are now the repo's own (no more system-font dependence).Test changes
install-pdf-tooling.sh(veraPDF + pinned poppler container) is deleted: conformance is validated by the compile itself (the declared output was verified against veraPDF--flavour ua1: 0 failed checks, and was pixel-identical to the previous engine's visual baselines), and the visual regression moved into the browser e2e suite, which rasterizes the produced PDF with pdf.js and screenshots each page (typst-pdf-page-N, chromium, deterministic via a fixedcreationTimestamp)..typimports, byte-reproducibility, font dedup/introspection, invalid-options throw), exporter suite (14: declare flow, lang gating, warnings forwarding, font-sync invariant, lazy blob, spread-extended defaults), slimmed pdfua structural test (pdf-lib as devDep for compressed-object assertions).Status
typst-pdf-page-Ne2e baselines committedNumbers vs typst.ts: 24.7MB wasm (vs 28.8MB, pre-binaryen — a modern
wasm-optpass is a known future size win), ~350 LOC owned (vs ~28k in the replaced stack), zero runtime deps beyond the two workspace packages.🤖 Generated with Claude Code
Summary by CodeRabbit
New Features
Improvements
Documentation