Passing env vars to command used in 'start:'

[davetapley]

Building on #85 ....

From the docs both approaches (env: host=api... and CYPRESS_host: api...) imply those are setting env vars for Cypress itself, not to the command given in start:? My testing certainly seems to indicate this is the case.

In my case I want to pass a REACT_APP_ variable in to npm start.

---

I tried simply prefixing the start: command, e.g.:

        with:
          start: 'REACT_APP_LEGACY_API="${{matrix.legacy}}" npm start'

but that fails with:

Error: Unable to locate executable file: REACT_APP_LEGACY_API="true". Please verify either the file path exists or the file can be found within a directory specified by the PATH environment variable. Also check the file mode to verify the file is executable.

I also tried various quotings, but get the same error.

[davetapley]

Figured it out via here:

Trick is to use top level env: (i.e. not inside the with:, and not to use the CYPRESS_ prefix:

        env:
          REACT_APP_LEGACY_API: ${{matrix.legacy}}

Thanks @shinaBR2! 🙏🏻