Incompatible with Composer 2

[lcharette]

Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - wikimedia/composer-merge-plugin dev-master requires composer-plugin-api ^1.1 -> found composer-plugin-api[2.0.0] but it does not match the constraint.
    - wikimedia/composer-merge-plugin[v1.4.0, ..., v1.4.1] require composer-plugin-api ^1.0 -> found composer-plugin-api[2.0.0] but it does not match the constraint.
    - wikimedia/composer-merge-plugin 1.5.x-dev is an alias of wikimedia/composer-merge-plugin dev-master and thus requires it to be installed too.
    - Root composer.json requires wikimedia/composer-merge-plugin ^1.4.0 -> satisfiable by wikimedia/composer-merge-plugin[v1.4.0, v1.4.1, 1.5.x-dev (alias of dev-master)].

You are using Composer 2, which some of your plugins seem to be incompatible with. Make sure you update your plugins or report a plugin-issue to ask them to support Composer 2.

This is dependent of an issue with wikimedia/composer-merge-plugin, and can only be solved once wikimedia/composer-merge-plugin#189 (comment) is merged and released.

Other reference : wikimedia/composer-merge-plugin#184

[lcharette]

We should be able to fix this now by upgrading wikimedia/composer-merge-plugin to this new release :
https://github.com/wikimedia/composer-merge-plugin/releases/tag/v2.0.1

[Silic0nS0ldier]

And raising our minimum PHP version from 7.1 to 7.2 (as per plugin requirements). Otherwise looks to a fairly straightforward update thankfully.

[lcharette]

We're still supporting 7.1? Might as well release 4.5 while at it. Do you have any other change / BC that requires a major bump ?

[Silic0nS0ldier]

Yeah, NodeJS for ESM support. Not ready for prime time yet, but raising will let it release more easily.
Min is ^12.17.0 || >=13.2.0.

[lcharette]

Yeah, NodeJS for ESM support. Not ready for prime time yet, but raising will let it release more easily.
Min is ^12.17.0 || >=13.2.0.

Care to push the required change to develop and/or open PR? I'll see if I can release this fix over the weekend.

[Silic0nS0ldier]

Sure. I'll see about getting it up this afternoon (my time, so in around 9 hours).

[Silic0nS0ldier]

I've opened #1138

[lcharette]

This issue is fixed in ab33733 on develop for 4.5.0 release.