Installing as non-root is confusing when already installed as root

[jespertheend]

When installing Deno as root (on Ubuntu in my case) you are prompted to add the following to $HOME/.bashrc:

export DENO_INSTALL="/root/.deno"
export PATH="$DENO_INSTALL/bin:$PATH"

However, if you then create a new user and su into that user, these variables are passed along to the new session.
So if you then try to install Deno as a specific user, it will complain:

mkdir: cannot create directory `/root`: Permission denied

It took me quite some time to realise that this was caused by the previously set $DENO_INSTALL variable. I tried to find documentation on installing deno as non-root both in these issues and on https://deno.land/manual but couldn't find anything.
Only after installing on a fresh Linux setup as non-root, without installing as root first, did I realise what was happening.

I think the best place to document this is to make the install script would warn you that $DENO_INSTALL is already set and that you can change it if you wish to install in another location. But otherwise the readme or https://deno.land/manual could also work.

[StrawberryChocolateFudge]

I second this.
Do not install Deno as root