postinst is in php-wikidiff2 1.5.1-5.
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 23 24 25 | #!/bin/sh
set -e
# Automatically added by dh_php/UNDECLARED
for conf in wikidiff2; do
    dpkg-maintscript-helper rm_conffile /etc/php/mods-available/${conf}.ini -- "$@"
done
if [ -e /usr/lib/php/php-maintscript-helper ] ; then
    . /usr/lib/php/php-maintscript-helper
    for version in 7.2 ; do
        for conf in wikidiff2 ; do
            php_invoke enmod $version ALL $conf || exit 1
	done
    done
else
    for conf in wikidiff2 ; do
        phpenmod $conf
    done
fi
# End automatically added section
# Automatically added by dh_installdeb/11.1.4ubuntu1
dpkg-maintscript-helper rm_conffile /etc/mediawiki-extensions/extensions-enabled/wikidiff2.php 1.4.1-1 -- "$@"
dpkg-maintscript-helper rm_conffile /etc/mediawiki-extensions/extensions-available/wikidiff2.php 1.4.1-1 -- "$@"
# End automatically added section
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