spawn

Background execution for Dart that works everywhere: isolates on native, Web Workers on the web, one API.

Package	Description
spawn	The core package. Pure Dart, zero runtime dependencies.

Planned siblings, not yet implemented:

Package	Description
spawn_flutter	Platform ServiceProviders — the Android foreground service host and the iOS background session. Ships as a Flutter plugin because that is the only way Kotlin service classes and manifest entries reach an app build.
spawn_jobs	Deferred, OS-scheduled work (WorkManager / BGTaskScheduler). JobEntry already parses in spawn so worker files need no migration.

See spawn/README.md to get started, and spawn/doc/wire_format.md for the byte format every message has, whether or not the bytes are produced.

Development

$ cd spawn
$ dart pub get
$ dart analyze                        # zero infos is the bar
$ dart test                           # VM
$ dart run spawn:build test/workers   # build the browser payload first
$ dart test -p chrome                 # browser

The browser suite needs its worker payload compiled before it runs. That is not a quirk of the tests — it is the same step any app takes, and running the suite without it is how you find out the debug fallback works.

License

MIT