Reproduction of a bug(?) in idb + fake-indexeddb + jsdom

1. Install

yarn install

2. Run tests

yarn test

The tests use the idb package to act upon the IndexedDB implementation by fake-indexeddb.

With jsdom environment in jest@27 acting on a transaction after allowing other code to run (per await) throws errors. This differs from executing the same calls in a node environment.

Result

Issue

The two tests added in https://github.com/ph-fritsche/repro-jest-jsdom-indexeddb/commit/0bd9819d0ab4175e39e446304d9c6353cb3e3aec confirm that the problem is the order of execution with setImmediate in jsdom environment.

Workaround

https://github.com/ph-fritsche/repro-jest-jsdom-indexeddb/blob/master/fix.js#L1

yarn test:fix