browser of browser.sharedStore is undefined when running tests against electron app

Environment (please complete the following information):

• WebdriverIO version: [6.4.0]
• Mode: [WDIO Testrunner]
• If WDIO Testrunner, running sync/async: [async]
• Node.js version: [12.18.4]
• NPM version: [6.14.8]
• Browser name and version: [Chrome 86]
• Platform name and version: [macOS Catalina 10.15.7]
• Additional wdio packages used (if applicable): [@wdio/spec reporter, wdio-chromedriver-service, @wdio/sync, @wdio/mocha-framework, @wdio/local-runner, @wdio/junit-reporter, @wdio/dot-reporter, @wdio/shared-store-service]

Config of WebdriverIO services: [‘chromedriver’, ‘shared-store’]

Describe the bug I have 3 spec files that run consecutively as a single test suite. In before hook of 1st spec I store some data coming from api response such as browser.sharedStore.set('accessToken', accessToken) and in spec file 3 I am getting that data as await browser.sharedStore.get('accessToken'). The problem is that when I run my tests againt electron app (I use spectron ^9.0.0) the browser becomes undefined since in case of electron app the client is not the browser and this causes error.

To Reproduce

1. Create 2 separate spec files
2. Make sure in 1st spec file you store some data in sharedStore
3. Make sure in 2nd spec file you get that data from sharedStore and use it
4. Make sure the tests are running against electron app via spectron library.
5. Confirm that code works and the browser is not undefined

Expected behavior Tests run successfully with stored data.

Log https://gist.github.com/Hayk-S/c911c7bcfa21b59db0d5fab424ce921a

[mgrybyk]

You can fork wdio shared store service and make it work in any other framework. As I said, it suppose to work only with webdriverio.

Perhaps a reproducible example might help to understand what is actually going on

[Hayk-S]

Will reopen when shareable code will be under hand