Migrating from WoltLab Suite 5.5 - TypeScript and JavaScript

Minimum requirements

The ECMAScript target version has been increased to ES2022 from es2017.

Subscribe Button (WCF.User.ObjectWatch.Subscribe)

We have replaced the old jQuery-based WCF.User.ObjectWatch.Subscribe with a more modern replacement WoltLabSuite/Core/Ui/User/ObjectWatch.

The new implementation comes with a ready-to-use template (__userObjectWatchButton) for use within contentInteractionButtons:

{include file='__userObjectWatchButton' isSubscribed=$isSubscribed objectType='foo.bar' objectID=$id}

See WoltLab/WCF#4962 for details.

Support for Legacy Inheritance

The migration from JavaScript to TypeScript was a breaking change because the previous prototype based inheritance was incompatible with ES6 classes.

Core.enableLegacyInheritance() was added in an effort to emulate the previous behavior to aid in the migration process.

This workaround was unstable at best and was designed as a temporary solution only.

WoltLab/WCF#5041 removed the legacy inheritance, requiring all depending implementations to migrate to ES6 classes.