Goal

I use fake-indexeddb for testing, which works great with Dexie except for problems with liveQuery's apparent* dependence on a global (*I may have misunderstood something!).

I believe it'll be fixed by being able to give liveQuery a reference to a specific indexedDb instance (like new Dexie can with DexieOptions).

How my FakeIndexedDb tests work

I create a new FakeIndexedDb instance per test, and pass it to Dexie.

import { IDBFactory, IDBKeyRange } from "fake-indexeddb";
const _indexedDB = new IDBFactory();
const db = new Dexie('name', {indexedDB: _indexedDB, IDBKeyRange})

I then use live query as normal on db.

What goes wrong

As I add more tests, FakeIndexedDb/Dexie run slower and slower. E.g. several seconds to run 'toArray' on an empty table - but that same test runs in 400ms when run in isolation.

To prove it's some kind of leak somewhere:

• I'm forced to use import "fake-indexeddb/auto" at the top of the test file, or liveQuery won't work. This is FakeIndexedDb's global. Only liveQuery needs it, as Dexie itself it passed an individual FakeIndexedDb instance. I suspect that global is being marshalled across tests by the test runner, causing the slow down.
• If I split the tests across separate test files, the Dexie/IDB performance is fine.

Request

I want to pass liveQuery something equivalent to DexieOptions, to give it the FakeIndexedDb instance.

I'd happily make a fork/PR myself, but some pointers of where to start from in ./src/live-query would help enormously (I've not succeeded at even finding any reference to the global indexedDb so far).