Platform specific environment variables

[tomasbjerre]

We want to allow different versions of Cypress with different projects, npm packages in Git repositories.

Current behavior:

If we add this in our .npmrc

CYPRESS_INSTALL_BINARY = https://this.is/the/linux/binary.zip

We will have something that will download the wrong binary when developers use Windows.

Desired behavior:

Allow platform specific environment variables, and fall back on current behavior if no specific variables are set.

The .npmrc can have:

CYPRESS_INSTALL_BINARY___linux = https://this.is/the/linux/binary.zip
CYPRESS_INSTALL_BINARY___win32 = https://this.is/the/win32/binary.zip

Where the suffix is taken from platform names in Nodejs.

So that on Windows the effective value of CYPRESS_INSTALL_BINARY would be https://this.is/the/win32/binary.zip.

These environment variables could then be put in the .npmrc in the repository of each application.

Steps to reproduce: (app code and test code)

#5037

Versions

All of them.

[mpahuja]

There is also https://docs.cypress.io/api/cypress-api/platform.html#Syntax along with https://docs.cypress.io/api/plugins/configuration-api.html#Usage can possibly do what you need

[tomasbjerre]

Thanks. I tried cypress/plugins/index.js with:

    if (Cypress.platform === 'win32') {
        config.env.INSTALL_BINARY =
            'https://npm.asdasd.se/win32-64/cypress.zip';
    } else {
        config.env.INSTALL_BINARY =
            'https://npm.asdasd.se/linux/cypress.zip';
    }

But it did not take. Still it downloads from default location, not the ones specified above.

[mpahuja]

should it be config.env.CYPRESS_INSTALL_BINARY instead of config.env.INSTALL_BINARY

[tomasbjerre]

I tried both.

[mpahuja]

actually by the time plugins file is read, cypress has already been installed so yeah this will not work. Sorry i misunderstood what you were trying to do here.

[bahmutov]

You have to set the environment variables before starting Cypress, which you can do with a small script. See #5037 (comment) too.