shared worker does not fulfill its promise

[ahoyahoy]

a shared worker does not fulfill its promise

minimal example
https://github.com/ahoyahoy/rxdb-shared-worker-error/blob/main/src/main.ts

getRxStorageWorker works ok
getRxStorageSharedWorker is still in pending

"rxdb": "15.7.0",
"rxdb-premium": "15.7.0",

[pubkey]

Could reproduce your error.
You can debug the shared worker process by opening this url in chrome: chrome://inspect/#workers

I get the in-shared-worker error:

Uncaught ReferenceError: Worker is not defined
    at node_modules/web-worker/cjs/browser.js (rxdb-premium_plugins_storage-worker.js?v=7b25e094:24:22)
    at __require (chunk-LNEMQRCO.js?v=7b25e094:9:50)
    at rxdb-premium_plugins_storage-worker.js?v=7b25e094:461:33

Seems that the problem comes from the web-worker package
This is used inside of the getRxStorageWorker function, I will check.

[pubkey]

Seems to be a bundling problem because it somehow bundles the getRxStorageWorker methode inside of the worker where it should normally be tree shaked.

[pubkey]

I tried to fix this from the RxDB side but this was not really possible. I made a PR at the web-workers package so we might be able to fix it there: developit/web-worker#45

In the meantime you could build your worker file with webpack so it does not import the code it doesnt need. I added the webpack config that is used on the premium packages to the docs: 7a7fd5d#diff-b2b38c09cb3bf9d03ed981e79cdb62f75cf3c9e345e6bd7ab3356574b7fa9e12

[ahoyahoy]

https://chromestatus.com/feature/6080438103703552

Dedicated workers can create nested workers, but shared workers and service workers cannot.

Creating a nested dedicated worker from a shared worker is not yet supported.

Nested shared workers are also in the spec, but there is no plan to support them at this time.

[ahoyahoy]

I misunderstood it and was looking for a solution for run a dedicated worker from a shared worker.
But I see now, if the web-worker does not return a Worker, it will not be necessary.
That's why I deleted my previous comments.
I wrote that you can use https://github.com/dmihal/Subworkers
But actually it only worked for me in dev mode (vite) and not after build.

[pubkey]

I checked out https://github.com/dmihal/Subworkers and this looks dangerous when used in multiple browser tabs that open and close randomly.
Notice that cross-worker communication is a performance bottleneck so using worker inside of your shared worker likely is slower then just using the shared worker and the subworkers package adds an additional layer of communication.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed soon. If you still have a problem, make a PR with a test case or to prove that you have tried to fix the problem. Notice that only bugs in the rxdb premium plugins are ensured to be fixed by the maintainer. Everything else is expected to be fixed by the community, likely you must fix it by yourself.

[stale]

Issues are autoclosed after some time. If you still have a problem, make a PR with a test case or to prove that you have tried to fix the problem.