MediaWiki 1.30.0 (d0c8f49)
PHP 7.2.1-1+ubuntu17.10.1+deb.sury.org+1 (fpm-fcgi)
`composer require mediawiki/graph-viz '*'` creates `extensions/GraphViz` folder yet doesn't enable the //GraphViz// extension for //MediaWiki//. It doesn't appear in Special:Version and the graphs remain source code.
`wfLoadExtension ('GraphViz');` helps but this is not the way //Composer// is supposed to work.
Also, if I try to alter //GraphViz// setting after enabling the extension (e.g. `$wgGraphVizSettings->execPath = '/usr/bin/';`), PHP issues a warning:
> Creating default object from empty value in //(path to MediaWiki)///LocalSettings.php on line //(line number)//.
Obviously, the `$wgGraphVizSettings` object is not instantiated at this point; I presume I should do it in some hook, but it is not documented at [[ https://www.mediawiki.org/wiki/Extension:GraphViz |the extension's page at mediawiki.org]].