feat: @powersync/dev added to support SQL.js #647
Draft
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
🦋 Changeset detectedLatest commit: 46bd668 The changes in this PR will be included in the next version bump. This PR includes changesets to release 8 packages
Not sure what this means? Click here to learn what changesets are. Click here if you're a maintainer who wants to add another changeset to this PR |
stevensJourney
commented
Jun 30, 2025
stevensJourney
commented
Jun 30, 2025
| commonjs({}), | ||
| alias({ | ||
| entries: [ | ||
| { find: 'fs', replacement: path.resolve(__dirname, 'vendored/empty.js') }, |
There was a problem hiding this comment.
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
| } | ||
| } | ||
|
|
||
| (globalThis as any).onSqliteUpdate = ( |
There was a problem hiding this comment.
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() { |
There was a problem hiding this comment.
This was not exposed by SQL.js, but we need it in order to validate the response from checkpoint validations.
Chriztiaan
changed the title
Chriztiaan
changed the title
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
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.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.
