Current Behavior:

I can install a version of npm in an environment where the engines property in the packument does not include the version of node it is being run under.

Expected Behavior:

npm refuses to install a version of npm for which it has a conflict between the current node version and the engines entry in the version of npm you are trying to install.

Environment:

• npm: 7.5.2

Problem statement

Today we allow users to install npm even though they might be on a version of node that we don't want to or can't support (ex. node@<10).

Features

• Test adding a preinstall script to npm@7 which warns/errors our of unsupported environment

Exit criteria

• script should not allow you to end up in a broken state/environment
• warning should provide context/details on how to fix or upgrade