Cypress: replace env in config: ${TOKEN}

Have you been running your Cypress tests in your automated test runner? Have you suddenly come across this seemingly strange error?

$ export CYPRESS_BASE_URL="http://localhost:3000"
$ yarn cypress run
yarn run v1.22.19
error An unexpected error occurred: "Failed to replace env in config: ${TOKEN}".
info If you think this is a bug, please open a bug report with the information provided in ".../yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

I searched by codebase for any usage of a plain TOKEN variable but I found nothing. I have token tokens in my automated test runner but those are for pulling packages, pushing packages and authorizing deployment actions. Nothing related to Cypress or otherwise.

The trick I found for this is: make a stubbed TOKEN value.

    step:
        name: cypress
        image: cypress:latest
        commands:
            - export CYPRESS_BASE_URL="http://localhost:3000"
+           - export TOKEN=""
            - yarn cypress run

I am not sure if this TOKEN issue is exclusive to my automated test runner, there were many hits online for a similar problem. Meanwhile, this seems to work well enough so I am not investigating further into the internals of Cypress or my runner.

Then only after that were ✔ All specs passed!.