mini-css-extract-plugin has replaced this module.
It looks packageable (maybe some devDeps are missing, but only for running some tests).

It is already packaged

$ rmadison node-mini-css-extract-plugin
node-mini-css-extract-plugin | 1.3.1-2~bpo10+1 | buster-backports |
source, all
node-mini-css-extract-plugin | 1.3.3-1         | stable           |
source, all
node-mini-css-extract-plugin | 2.4.6+~2.4.0-3  | testing          |
source, all
node-mini-css-extract-plugin | 2.4.6+~2.4.0-3  | unstable         |
source, all

and looks like no reverse dependencies for this package. So may be we
can remove this package.

$ reverse-depends node-extract-text-webpack-plugin
pravi@ilvala2:~$ reverse-depends -b node-extract-text-webpack-plugin
No reverse dependencies found

Dear submitter,

as the package node-extract-text-webpack-plugin has just been removed from the Debian archive
unstable we hereby close the associated bug reports.  We are sorry
that we couldn't deal with your issue properly.

For details on the removal, please see https://bugs.debian.org/1013217

The version of this package that was in Debian prior to this removal
can still be found using http://snapshot.debian.org/.

Please note that the changes have been done on the master archive and
will not propagate to any mirrors until the next dinstall run at the
earliest.

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmaster@ftp-master.debian.org.

Debian distribution maintenance software
pp.
Thorsten Alteholz (the ftpmaster behind the curtain)