feat: @powersync/dev added to support SQL.js #647
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🦋 Changeset detectedLatest commit: 0e0ef52 The changes in this PR will be included in the next version bump. This PR includes changesets to release 8 packages
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stevensJourney
commented
Jun 30, 2025
stevensJourney
commented
Jun 30, 2025
| commonjs({}), | ||
| alias({ | ||
| entries: [ | ||
| { find: 'fs', replacement: path.resolve(__dirname, 'vendored/empty.js') }, |
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The default Emscripten output contains code like require("fs"). This seems to be unreachable, but Metro complains when it detects it. This replaces the requires to return empty modules.
stevensJourney
commented
Jun 30, 2025
| } | ||
| } | ||
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| (globalThis as any).onSqliteUpdate = ( |
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The standard update hook function did not trigger for me. I've implemented this as a workaround.
stevensJourney
commented
Jun 30, 2025
| + /** TODO | ||
| + @return {number} the last insert id | ||
| + */ | ||
| + Database.prototype["lastInsertId"] = function lastInsertId() { |
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This was not exposed by SQL.js, but we need it in order to validate the response from checkpoint validations.
Chriztiaan
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Chriztiaan
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Overview
Certain environments have trouble loading PowerSync due to it requiring a SQLite implementation which supports loading our Rust core extension. One of these environments is Expo Go which is a prebuilt app container for Expo apps.
The new
devpackage uses a pure JS implementation of SQLite via SQL.js which has been forked. SQLite and our Rust core extension are compiled to JavaScript via Emscripen there. This pure JS payload can be used in environments such as Expo Go.Outstanding work
SQL.js operates in memory. We can persist the entire DB to disk on commit though. This has not yet been implemented for RN.Added Expo persister in the dev adapter's README.mdThis currently builds SQL.js in the monorepo. This requires toolchains which we should not expect all users of the monorepo to have present. We could fallback to prebuilt assets in such cases.This build was moved out to the SQL.js fork.react-nativeas it's currently the biggest use case for this dev package.Demo
ExpoGo2.mp4
Benchmarks
Tested 1000 separate list insertions, PowerSync not connected. Haven't been able to understand why the Expo file persister version is faster than the in-memory persister.
