[Feature Request]: If npm cafile setting exists, use it when downloading from unique ELECTRON_MIRROR

[aarowman]

Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Problem Description

Currently, when using a custom ELECTRON_MIRROR value, if the mirror repository requires a CA file, then Electron will not use a local CA by default. The user must set the NODE_EXTRA_CA_CERTS variable to get it added, since the Electron post install script for installing the binary uses node in the command, and is not an npm install.

Note that running npm on a CI system, the cafile location may not be known ahead of time (could be set on the CI runner system). The current workaround is to dynamically call npm config get cafile and assign the value into NODE_EXTRA_CA_CERTS

Proposed Solution

I think it would be helpful to automatically use the cafile value from .npmrc (npm config) when downloading a unique binary. Similar behavior was done in the cypress library (Cypress also downloads a binary with a zip using a post install and has a mirror environment variable).

See relevant code: https://github.com/search?q=repo%3Acypress-io%2Fcypress+getCa+%3D&type=code

Cypress docs for reference:

• Mirroring
• using custom CA

Alternatives Considered

The current workaround is to dynamically call npm config get cafile and assign the value into NODE_EXTRA_CA_CERTS, which does work.. but can be tedious in a CI system since it may be dynamic

Additional Information

No response