[BUG] process.env.npm_config_user_agent missing in v7

[alexander-mai]

Current Behavior:

npm i --save-dev husky doesn't run the install and postinstall scripts after installing the package so the git hooks are never setup.
The reason is the missing environt variable npm_config_user_agent

Expected Behavior:

The env var npm_config_user_agent is set.
The variable is set on npm version 7.6.3.

Steps To Reproduce:

npm i --save-dev husky
See the error message

husky > Setting up git hooks
Cannot destructure property `name` of 'undefined' or 'null'.
husky > Failed to install

Environment:

• OS: MacOS 11.2.3
• Node: 10.24.0
• npm: v7.7.2

[jspivack]

Also seeing this in 7.7.4 when trying to run a script with run-script-os