Steps to reproduce

• If you go to https://phabricator.wikimedia.org/diffusion/ESFO/browse/master/SemanticForms.php;46d3369c31543ef159c0dc5dbd4460aa001ea6f4$53 and https://phabricator.wikimedia.org/diffusion/ESFO/browse/master/SemanticForms.php;46d3369c31543ef159c0dc5dbd4460aa001ea6f4$60 and https://phabricator.wikimedia.org/diffusion/ESFO/browse/master/SemanticForms.php;46d3369c31543ef159c0dc5dbd4460aa001ea6f4$69

• But if you go to https://phabricator.wikimedia.org/diffusion/ESFO/browse/master/extension.json;46d3369c31543ef159c0dc5dbd4460aa001ea6f4$3

Actual results

• You carn't use a defined version in extension registration you have to set it manually.

Expected results

• You should be able to use a defined version

for example on how it should look.

"versiondefine:" "Example::Example, "SF_VERSION"

the hook where it is defined and then what it should look for in define.

I am not sure if this way is support in json there may be another way.

Notice instead of using "version" we are using a "versiondefine" instead.

@Legoktm what do you think.

Some extensions such as wikibase do this.

I think proper define support needs to be added.