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Load browser SQLite WASM as a separate asset by default - #2103
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| Layer / File(s) | Summary |
|---|---|
Emit and package the WASM asset packages/browser-db-sqlite-persistence/vite.config.ts, packages/browser-db-sqlite-persistence/src/vite-env.d.ts, packages/browser-db-sqlite-persistence/package.json, packages/browser-db-sqlite-persistence/README.md, .changeset/browser-sqlite-separate-wasm.md, scripts/check-doc-snippets.mjs |
Vite emits the WASM file as a separate asset and preserves its URL in worker code. The package exports the asset. The README and changeset describe the separate asset and automatic loading. The documentation snippet checker now reads export targets and skips string-valued exports. |
Resolve and pass asset URLs packages/browser-db-sqlite-persistence/src/opfs-database.ts, packages/browser-db-sqlite-persistence/src/opfs-worker-protocol.ts, packages/browser-db-sqlite-persistence/src/opfs-worker.ts, packages/browser-db-sqlite-persistence/tests/* |
The database open flow resolves worker and WASM URLs and covers asset resolution and initialization with timeout and abort handling. The worker passes the WASM URL to SQLiteESMFactory through locateFile. Tests cover the required page location and initialization request. |
Validate packaged consumer builds packages/browser-db-sqlite-persistence/e2e/*, .github/workflows/e2e-tests.yml, docs/contributing/oracle-coverage.md |
End-to-end tests check emitted assets and SQLite queries in development, preview, and install-layout configurations. They also check timeout and abort behavior during asset lookup. The browser workflow runs these tests. |
Priority:
Estimated code review effort: 3 (Moderate) | ~25 minutes
Change: Feature
Sequence Diagram(s)
sequenceDiagram
participant App as Consumer application
participant Database as OPFS database
participant Worker as OPFS worker
participant Factory as SQLiteESMFactory
participant WASM as wa-sqlite WASM asset
App->>Database: Open database
Database->>Worker: Send init request with wasmUrl
Worker->>Factory: Initialize with locateFile
Factory->>WASM: Load WASM from wasmUrl
Merge Risk: 
8925b
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Database opening now observes configured timeout and cancellation deadlines, with no remaining merge-blocking risk identified.
Pre-merge checks: 
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Check name Status Explanation Resolution Description check The description follows the repository template's sections (Changes, Oracle Coverage, Checklist, Release Impact) and explains the change in depth: separate WASM and worker assets, how Vite development… Tick the applicable checklist and Release Impact boxes. The changeset is present, so the first Release Impact box should be ticked. Confirm that the local test checkbox reflects pnpm testruns. In Oracle Coverage, name the coverage-map ow…-
Check name Status Explanation Title check The title clearly and concisely describes the primary change: loading browser SQLite WASM as a separate asset. Linked Issues check Issue #2101asks for a way to load wa-sqlite WASM by URL instead of inlining it as base64. It accepts awasmUrl/locateFileoption, acreateWorkeroption, or a worker that does not inline the WAS…Out of Scope Changes check Every changed area supports the #2101objective. Source changes:opfs-database.ts,opfs-worker.ts,opfs-worker-protocol.ts,vite-env.d.ts, andvite.config.tsimplement separate WASM emission…Full details: Linked Issues check
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Explanation
Issue
#2101asks for a way to load wa-sqlite WASM by URL instead of inlining it as base64. It accepts awasmUrl/locateFileoption, acreateWorkeroption, or a worker that does not inline the WASM. The reviewed head uses the last option. The package build emitsdist/wa-sqlite.wasmas a separate asset.package.jsonexports the WASM file andassets/*.BrowserOPFSWorkerInitRequestadds a requiredwasmUrl: string.opfs-worker.tspasses that URL toSQLiteESMFactorythroughlocateFile. The PR description reports that the worker no longer contains a base64 WASM data URL. Tests cover the separate asset path: the packaged-consumer e2e tests check a separateapplication/wasmresponse. The OPFS tests cover the missing-locationfailure. The Vite development path (resolveViteAssetUrls) and the timeout and abort changes do not remove the required behavior. Earlier PASS conclusions remain supported by the changed code described in the summary. I did not inspect the source diff directly for this assessment. Verdict rests on the whole-PR summary and the previous assessment.
Full details: Out of Scope Changes check
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Explanation
Every changed area supports the
#2101objective. Source changes:opfs-database.ts,opfs-worker.ts,opfs-worker-protocol.ts,vite-env.d.ts, andvite.config.tsimplement separate WASM emission and URL passing. Theopfs-database.tstimeout and abort reordering supports the new asynchronous asset resolution step.package.jsonexports the new asset. The change toscripts/check-doc-snippets.mjshandles string-valued export targets, which the newwa-sqlite.wasmandassets/*exports introduce. Tests (e2e, oracle, and unit tests) verify the new behavior. Thee2e-tests.ymlstep runs those tests. The README and changeset describe the new behavior.docs/contributing/oracle-coverage.mdrecords the new lookup coverage. No change is shown to be unrelated to#2101.
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Full details: Description check
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Explanation
The description follows the repository template's sections (Changes, Oracle Coverage, Checklist, Release Impact) and explains the change in depth: separate WASM and worker assets, how Vite development resolves asset URLs, failure classification, size measurements, and verification. The Oracle Coverage section is detailed and names the oracle files and results, but it does not name a coverage-map owner or summarize the bug-class closure in the template's required form. The checklist has no ticked items. The Release Impact section has no box ticked, though the changeset is present in the change set. The description also omits the coverage-map entry reference that the template asks for.
Resolution
Tick the applicable checklist and Release Impact boxes. The changeset is present, so the first Release Impact box should be ticked. Confirm that the local test checkbox reflects
pnpm testruns. In Oracle Coverage, name the coverage-map owner or entry that this bug fix extends. For a bug fix, state the violated law, the exercised histories, the production paths, the observation checkpoints, the RED/GREEN result, and the remaining limits in the template's form. The description covers most of these items, but it is not organized under that structure.
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Review comments at @packages/browser-db-sqlite-persistence/src/opfs-database.ts:
- Line 178: Update openBrowserWASQLiteOPFSDatabase so timeout and abort handling
covers the Promise.all asset imports for wasmAsset and workerAsset, rather than
starting only after the worker exists. If the deadline or abort ends the open
while imports are pending, ensure their later completion cannot create a worker.
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packages/browser-db-sqlite-persistence/e2e/wasm-install-layouts.e2e.test.tspackages/browser-db-sqlite-persistence/package.jsonpackages/browser-db-sqlite-persistence/src/opfs-database.tspackages/browser-db-sqlite-persistence/tests/opfs-database.test.ts
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… cover it with the open deadline The Vite dev-server asset lookup ran whenever a Vite client script was present, including when Vite serves this package's source. The source fixtures then asked Vite for installed package exports that do not exist, and every OPFS fairness E2E test failed. A build-only define now limits the lookup to the built package, whose assets the dependency optimizer leaves behind. The open deadline and abort signal also started only after the lookup, so a held lookup kept the open pending past timeoutMs and ignored an abort. They now start before asset resolution, and an interrupted open creates no worker when the lookup later completes. A packaged-consumer receiving witness holds the WASM lookup in Chromium; it fails on the previous opener and on a mutant that creates a worker after the late lookup. The request-order Node driver from main now stubs the page location that the opener requires. Co-authored-by: Isaac <no-reply@databricks.com>
The checker mapped every published export to a TypeScript source and threw for the browser SQLite package's new `./wa-sqlite.wasm` and `./assets/*` exports. Those exports are plain string targets with no types condition, so no snippet can import them as a typed entry point. Skip string-valued exports, which also covers `./package.json`. Co-authored-by: Isaac <no-reply@databricks.com>
…port excluded installs The README surfaces OPFS capability failures as PersistenceUnavailableError. Under Vite development the packaged asset lookup broke that contract: - A failed WASM or worker lookup, as in a transitive install that the Vite root cannot resolve by package name, rejected with a raw TypeError. - Vite's asset paths were resolved against the page URL, so an about:srcdoc frame threw "Invalid URL". They now resolve against the Vite server. - With the page on another origin than Vite, the Worker constructor threw SecurityError. Constructor failures are now classified. The lookup also ran when the package was excluded from pre-bundling, so the exclusion could not fix an unresolvable install. It now runs only when the built worker URL no longer sits in the package's dist/assets. The README documents the exclusion for transitive, aliased, or duplicate installs. The built package starts its classic-script worker as a classic worker again, as before this branch, so browsers without module workers can run it. Source served by Vite still starts a module worker. Receiving witnesses in the packaged-consumer and install-layout e2e tests fail on the previous code for each case. Mutants that classify only the WASM lookup, or that skip the lookup everywhere, also fail. The fixture comment about wa-sqlite pre-bundling no longer claims that it locates the WASM. Co-authored-by: Isaac <no-reply@databricks.com>
…e by asset layout A second review of the branch found two more gaps in the separate-asset path: - The worker now fetches wa-sqlite.wasm itself. A missing or blocked file was reported as an internal OPFSWorkerRequestError. It is a capability failure, so the worker now reports PersistenceUnavailableError. - The in-place check matched the `dist/assets/` path name, so a Vite cache directory named `dist` skipped the lookup that moved code needs. The check now compares the asset layout instead: in place, the worker's parent directory is the WASM file's directory; moved code resolves them apart. Smaller fixes from the same review: - Set worker.format to iife explicitly, beside the classic worker type that depends on it. - Drop an unreachable worker-file-name check. - The doc-snippet check skips only string exports that are not JavaScript modules, so a plain-string code export still needs a source mapping. - The packaged-consumer CI step builds only this package; the earlier step already builds its workspace dependencies. The consumer and install-layout witnesses add a missing WASM file and a cache directory named dist. Both failed on the previous code and pass now. Co-authored-by: Isaac <no-reply@databricks.com>
…p open failures handled A third review of the branch found these gaps: - Asset URLs were resolved against location.href. The Worker constructor resolves against the document base, which an about:srcdoc frame inherits, so Vite-served source opened from such a frame threw "Invalid URL". The opener now uses document.baseURI and falls back to location.href. - An abort during option evaluation rejects the open's failure signal before any step awaits it. If the Worker constructor then threw, that rejection was unhandled. The signal now has a no-op handler. - The worker transform returned code without a source map, so every build warned. It now returns map: null; the edit stays on one line. - The base comment in vite.config.ts described the old ?worker import. It now names the two emitted URLs and the depth difference that the moved-code check depends on. - The OPFS fixtures no longer exclude wa-sqlite from pre-bundling. The worker supplies the WASM URL, and two cold full fairness runs pass without it. Focused tests for the frame base and the unhandled rejection failed on the previous code and pass now. Co-authored-by: Isaac <no-reply@databricks.com>
The `./assets/*` export made every hashed build file public, including source maps, and those paths changed with each release. The worker build now uses a fixed file name, dist/assets/opfs-worker.js, and package.json exports only that file next to `./wa-sqlite.wasm`. Consumer bundlers still emit the worker under their own hashed name. The Vite dev lookup asks for `opfs-worker.js` directly, so the code that read the hashed name back out of the worker URL is gone. A packaged-consumer test checks that the two asset exports are the only string exports and that both files exist. Co-authored-by: Isaac <no-reply@databricks.com>
The snippet check required a source file for every string export that ends in .js. The browser SQLite package now exports its OPFS worker as `./opfs-worker.js`, an untyped runtime asset, so Lint failed with "No source". A typed snippet can import only an export that declares a `types` condition. The check now skips exports without one, such as package.json, a WASM file, or a worker script, and still requires a source for every typed export. Co-authored-by: Isaac <no-reply@databricks.com>
Add two model-driven oracles for the separate-asset open path, replace the fixed witnesses that stated their own expected results, and correct the README where the new install-layout model disagreed with it. Open outcome oracle. tests/opfs-open-outcome-oracle.ts holds the law, the history grammar, the model, and the comparison for how an open settles across the Vite asset lookup, worker start, WASM load, and initialization, including the deadline and abort. A jsdom driver reaches worker start, initialization, and the worker's WASM failure response; a Chromium driver reaches the lookup, the real WASM fetch, and worker start against a Vite dev server. Each driver fails when its product reaches fewer outcomes than it declares. Mutants that leave the lookup outside the deadline, start a worker after a late lookup, report a WASM failure as internal, or leak a refused Worker constructor's error each fail the driver that reaches that step. The Chromium driver uses no elapsed time: it pauses the page clock and advances it for the deadline, interrupts only after the server holds the lookup, and reads results one task after each event. Install-layout oracle. A model predicts whether direct, hoisted, pnpm, transitive, npm-alias, and two-copy installs open, across three cache directories, exclusion by import or package name, and dev or production. It showed that two installed copies open with the root copy's assets rather than rejecting, and that an npm alias must be excluded by its alias name. The README now says so. Its dev servers do not watch files, because a late watcher event reloaded pages during an open. Co-authored-by: Isaac <no-reply@databricks.com>
…um driver The Chromium open outcome driver used Playwright's page clock. The repository's mangle check treats any `.clock` read outside packages/db as unsafe, because packages/db mangles a private member of that name, so CI failed. An init script now holds back only the opener's deadline timer, recognized by a delay that no other page timer uses, and the driver fires it explicitly. Every other page timer runs normally. A mutant that leaves the asset lookup outside the deadline still fails both interrupted histories with a pending settlement. Co-authored-by: Isaac <no-reply@databricks.com>
…model A review of the new oracles found that their reach checks judged only the grammar, that worker start lacked its most likely failure, and that the layout model pinned an answer per layout. Open outcome oracle: - Each observation now records the steps production reached: the dev server counts lookup and WASM file requests, the page probe counts Worker constructor calls, and the jsdom worker counts initialization requests. A mutant that rejects before making the lookup now fails only on this witness. - Worker start gains a script that fails to load after construction. Both drivers reach it, and production already settled it correctly. - Each Chromium history uses a new browser context, so no HTTP cache or OPFS state carries between histories. Install-layout oracle, renamed to include "oracle": - The model reads the importer's specifier and the Node resolution of the package name from each installed tree, and it predicts the worker count. The README states that an open inside a worker, or a page that loads the Vite client without a script src, also needs the exclusion. A versioned review record classifies each calibration control and records every applicable oracle requirement. Co-authored-by: Isaac <no-reply@databricks.com>
The jsdom open outcome driver stored a MessageEvent listener in a set of Event listeners, which the package's Vitest typecheck rejects. The error listeners now share the message listener type, and the dispatched error event is cast to it. Co-authored-by: Isaac <no-reply@databricks.com>
…t.js apps The separate WASM asset was tested only with Vite. Add receiving witnesses for a webpack 5 app (production and development builds) and a Next.js app (Turbopack and webpack, each under next build with next start and under next dev). Each installs the built workspace packages as published packages, opens and queries SQLite in Chromium, and checks one classic worker, one 200 application/wasm response, and no Vite lookup request. A module-worker mutant fails all six cases. A lookup that runs without a Vite client fails the four Next.js cases and is equivalent under webpack, which emits the worker and WASM into one directory. Webpack and Turbopack resolve tsconfig paths, and each workspace package's tsconfig points at sibling sources. Published packages ship no tsconfig, so the apps copy each built package rather than linking the workspace. Adds next, react, react-dom, and webpack as dev dependencies. webpack's terser plugin raises the deduplicated terser to 5.51.2, which renames the vite peer suffix throughout the lockfile; nothing in the repository minifies with terser. Co-authored-by: Isaac <no-reply@databricks.com>
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…e Vite lookup from production Version check. Under a Vite dev server, a pre-bundled copy loads the assets of the copy that the app root resolves, which can be another installed version, so one version's opener could drive another version's worker. The package build now gives the opener and the worker one version marker. The opener sends it with initialization, and a worker from another build rejects with PersistenceUnavailableError, naming both versions and the remedy. Only versions with the Vite lookup can pair copies, and all of them carry the check. Production gate. The Vite dev-server lookup now runs behind `devBuild() && process.env.NODE_ENV !== 'production'`, the pattern that packages/db uses, so webpack, Next.js, and Vite production builds drop it. The opener in a production bundle falls from 4,135 to 3,697 bytes minified. Witnesses, each failing on the previous code: - The install-layout oracle gains a two-version layout whose nested copy is a different build; pre-bundled, it now rejects after one worker starts. - The webpack, Next.js, and Vite consumer production builds must contain none of the lookup. Vite production builds in the tests now run with NODE_ENV=production, as a real `vite build` does; under Vitest's NODE_ENV=test they kept dev code. Co-authored-by: Isaac <no-reply@databricks.com>
…e persistence A browser can expose the OPFS API yet refuse its storage root, as in a private window or Playwright's WebKit build. The worker reported that as an internal OPFSWorkerRequestError, although the README surfaces OPFS capability failures as PersistenceUnavailableError. The worker now acquires the storage root before it loads the WASM file and answers PERSISTENCE_UNAVAILABLE with the browser's error name and message. A worker-side PersistenceUnavailableError also sent its full message, and the opener added the class's prefix again, so users saw "Persistence unavailable: Persistence unavailable: ...". The response now carries only the details, as the worker protocol and the lifecycle oracle already state. This also fixes the WASM load and version mismatch messages. The worker diagnostics oracle gains a storage-root failure dimension. Its mock VFS now acquires the storage root as the real one does. Both changes failed on the previous worker and pass now. In Playwright's WebKit, the open now rejects with PersistenceUnavailableError; Firefox still opens. Co-authored-by: Isaac <no-reply@databricks.com>
Safari 27.0 on macOS opened SQLite under Vite development, through the asset lookup, and under a production preview, with one classic worker. Playwright's Firefox 150 did the same; Playwright's WebKit refuses OPFS storage and now reports PersistenceUnavailableError. Co-authored-by: Isaac <no-reply@databricks.com>
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Brings in #2266 (Collection keys stay in the key type; large sync restores merge) and #2103 (browser-sqlite loads its WASM as a separate asset). The coverage map's two conflicting rows changed on one side each; the mangle cache is regenerated. db, query-db, Electric, PowerSync, TrailBase, both SQLite persistence packages, and React pass on the merged tree. Co-authored-by: Isaac <no-reply@databricks.com>
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Summary
@tanstack/browser-db-sqlite-persistencenow ships the OPFS worker andwa-sqlite.wasmas separate assets. Apps use the existing database API without an asset copy step or a WASM URL option.The worker previously embedded the WASM binary as a base64 data URL. The browser now fetches the binary as a separate
application/wasmasset. It can compile the binary while it streams, and a strict CSP no longer needsdata:inconnect-src. This is the separate-asset solution from #2101.How it works
dist/wa-sqlite.wasmanddist/assets/opfs-worker.jsunder fixed names.package.jsonexports them as./wa-sqlite.wasmand./opfs-worker.js. Consumer bundlers emit both under their own hashed names.SQLiteESMFactorythroughlocateFile.dist/directory, the opener asks the dev server for the package's asset exports. A copy served in place skips that lookup.PersistenceUnavailableError. This happens when the app reaches the package only through another library or through an npm alias. With more than one installed copy, the pre-bundled copy loads the assets of the copy that the app root resolves; when that copy is another version, its worker refuses the opener and the open rejects withPersistenceUnavailableError. The README documentsoptimizeDeps.excludefor those installs, listing the name that the importing code uses.devBuild() && process.env.NODE_ENV !== 'production', the patternpackages/dbuses, so production builds drop it.PersistenceUnavailableError, which the README promises for capability failures.PersistenceUnavailableErrorinstead of an internal error, and worker-side messages no longer repeat the "Persistence unavailable:" prefix.Size
opfs-database.js+ worker wrapper), minifiedwa-sqlite.wasmThe browser now downloads about 473 KB brotli instead of about 573 KB, and it compiles the WASM while it streams.
In a production bundle the opener grows by 445 B minified. The Vite development lookup ships only in development builds. The growth covers asset resolution with the open deadline and abort signal, the opener's version for the worker's version check, and the classification of asset and worker-start failures. Alternatives considered:
optimizeDeps.excludefor every Vite app would remove the lookup, but it would make every Vite app add configuration.wasmUrloption would add public API, which browser-db-sqlite-persistence: option to load the wa-sqlite WASM by URL instead of inlined base64 #2101 did not need.The
Compressed sizecheck and thesize:comparescenarios do not include this package, so the typicalappscenario does not change.Verification
tests/opfs-open-outcome-oracle.ts) models how an open settles across the asset lookup, worker start, WASM load, and initialization, with the deadline and abort. Its jsdom driver and its Chromium driver against a real Vite dev server pass every history in their bounded products. Each observation records the steps that production reached, and the Chromium driver uses no elapsed time.e2e/install-layout-oracle.e2e.test.ts) models direct, hoisted, pnpm, transitive, npm-alias, and two-copy installs across three cache directories, exclusion choices, and development or production. All 31 cases match. Its model corrected two README claims.200 application/wasmasset, anabout:srcdocframe, and a page on another origin than the Vite server.e2e/bundler-consumers.e2e.test.ts) open and query SQLite from a webpack 5 app (production and development builds) and a Next.js app (Turbopack and webpack, undernext buildwithnext startand undernext dev). Each starts one classic worker, loads one200 application/wasmasset, and makes no Vite lookup request. These checks run on the final head and replace the earlier one-time Next.js check.9d0ee7234: Safari 27.0 on macOS and Playwright's Firefox 150 opened SQLite, wrote and read a row, and started one classic worker, under Vite development (through the asset lookup) and a Vite production preview. Playwright's WebKit build refuses OPFS storage even on a blank page; there the open now rejects withPersistenceUnavailableError.0bca94eunder a strict CSP in browser-db-sqlite-persistence: option to load the wa-sqlite WASM by URL instead of inlined base64 #2101. That check was not repeated on the final head.The repository tests cover Vite, webpack 5, and Next.js with Turbopack and webpack, in development and production, in Chromium; Firefox and Safari were checked by hand. Nothing covers webpack-dev-server, Rspack, Parcel, esbuild, an open from inside a worker, or a Vite client injected without a script
src.Fixes #2101
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This pull request and its description were written by Isaac.