Follow-up to (PouchDB / LevelDB / LevelDown): MaxListenersExceededWarning, Error: once called more than once

[danielweck]

Follow-up to:
#406

According to feedback from other developers on the PouchDB issue tracker (see pouchdb/pouchdb#7819 (comment) and pouchdb/pouchdb#7825 ), this package.json workaround is effective:

 "resolutions": { "leveldown": "5.0.2", "levelup": "4.0.2" },

As you can see, this forces specific versions of LevelDown and LevelUp, instead of what we are doing now: setting a fixed version 7.0.* for pouchdb-adapter-leveldb (we also freeze leveldown to 5.*.*):

https://github.com/readium/readium-desktop/blob/59cf6aff032f50f2d631642edb308bfcd81034aa/package.json#L172
https://github.com/readium/readium-desktop/blob/59cf6aff032f50f2d631642edb308bfcd81034aa/package.json#L263-L264
https://github.com/readium/readium-desktop/blob/59cf6aff032f50f2d631642edb308bfcd81034aa/src/package.json#L36-L37

[danielweck]

For what it's worth, I posted an issue in the LevelDown tracker:
Level/leveldown#686

[danielweck]

Ah, a better workaround which allows us to use the latest leveldown (^5.3.0):
480dac7
See: Level/leveldown#686 (comment)

Tested successfully on MacOS with:
rm -rf dist && rm -rf node_modules && npm install && npm run __postinstall && npm run start

[danielweck]

Follow-up: the latest leveldown version 5.4.0 does not fix the issue, so we are keeping the workaround for now. See:
3331b92
Level/leveldown#686 (comment)