Allow passing configuration via environment variables

[icholy]

Is your feature request related to a problem or a nice-to-have?? Please describe.

I have a launch config in neovim which runs npm test. I'd like a mechanism to pass --inspect-brk to mocha. Setting NODE_OPTIONS=--inspect-brk isn't an option because it affects all tools that are executed by the test script.

Describe the solution you'd like

A MOCHA_OPTIONS environment variable variable similar to NODE_OPTIONS.

Describe alternatives you've considered

Yargs has support for env variables: https://yargs.js.org/docs/#api-reference-envprefix
However, using this feature would result in a separate env variable for each option:

Ex:

• MOCHA_BAIL
• MOCHA_ALLOW_UNCAUGHT
• MOCHA_FAIL_ZERO
• etc ...

[icholy]

PR #4835

[JoshuaKGoldberg]

Duplicate of #4330.