[BUG] npm config set noproxy - obj[key].join is not a function

[twigy11]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

since npm@7.17.x when executing npm config set noproxy "stringparameter" throw obj[key].join is not a function exception.

This happens because the noproxy array default value is overwritten by the string, which one doesn't have the join function

this is the noproxy flatten function result

param noproxy [ '' ]
obj[Key] [ '' ]
param noproxy [ '' ]
obj[Key] [ '' ]
param noproxy Banana
obj[Key] Banana

I've downgraded the versión until 7.15.x. This is the last version working

Expected Behavior

the noproxy config variable set the new value

Steps To Reproduce

1. node14.17.1 and npm 7.19
2. default
3. Run npm config set noproxy "localhost"
4. obj[key].join is not a function exception.

Environment

• OS: Ubuntu 20.04
• Node: 14.17.1
• npm: 7.19.0

[wraithgar]

This was fixed in v7.20.0