postrm is in node-constants-browserify 1.0.0+dfsg-5.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22  | #!/bin/sh
set -e
CONSTANTS_FILE="$DPKG_ROOT/usr/lib/nodejs/constants-browserify/constants.json"
case "$1" in
  remove)
    rm -f "$CONSTANTS_FILE"
  ;;
  purge|upgrade|failed-upgrade|abort-upgrade|abort-install)
  ;;
  *)
    echo "postrm called with unknown argument \`$1'" >&2
    exit 1
  ;;
esac
exit 0
 |