Issue updating to v10 with composer

[dexgs]

I ran into the same issue described here by a reddit user: https://old.reddit.com/r/mediawiki/comments/1170jrz/maps_100_will_not_install_what_to_do/

With the following composer.local.json:

{
    "require": {
        "mediawiki/maps": "^10.0",
        "mediawiki/semantic-media-wiki": "^4.0"
    },

    "extra": {
        "merge-plugin": {
                        "include": [
                                "extensions/*/composer.json",
                                "skins/*/composer.json"
                        ]
        }
    }
}

I got the following error after running composer update --no-dev:

  Problem 1
    - mediawiki/core is present at version 1.0.0+no-version-set and cannot be modified by Composer
    - mediawiki/maps[10.0.0] cannot be installed as that would require removing mediawiki/core[1.0.0+no-version-set]. They both replace mediawiki/semantic-maps and thus cannot coexist.
    - Root composer.json requires mediawiki/maps ^10.0 -> satisfiable by mediawiki/maps[10.0.0].

I was able to resolve the issue by temporarily removing composer.local.json, running composer update --no-dev and then restoring composer.local.json and updating a second time, but I don't understand what caused the problem in the first place.

The mediawiki/core package doesn't seem to make any mention of mediawiki/semantic-maps, so I'm not sure where the conflict comes from.

I would appreciate any help understanding the what causes the problem so I don't have it in the future.

[felipeforte]

Currently facing the same issue with a MediaWiki 1.41 installation.

  Problem 1
    - mediawiki/core is present at version dev-main and cannot be modified by Composer
    - mediawiki/maps[10.1.0, 10.1.1, 10.1.2] cannot be installed as that would require removing mediawiki/core[dev-main]. They both replace mediawiki/semantic-maps and thus cannot coexist.
    - Root composer.json requires mediawiki/maps ~10.1 -> satisfiable by mediawiki/maps[10.1.0, 10.1.1, 10.1.2].

[JeroenDeDauw]

Don't do this: "extensions/*/composer.json",, it is causing stuff to be loaded multiple times

[dexgs]

Don't do this: "extensions/*/composer.json",, it is causing stuff to be loaded multiple times

If I don't include this line in my composer.local.json, then running composer update causes many dependencies of built-in mediawiki extensions (such as OAthAuth) to be removed.

I don't understand how to reconcile this. If I don't include this line, the maps extension installs properly, but many other extensions are now broken due to missing their dependencies. If I include this line, the maps extension refuses to install. Please advise.

[samwilson]

The mediawiki/core package should no longer be used anywhere — and it's not used by Maps from what I can see, so where's that coming from?