UI5 Legacy-Free
The abap2UI5 frontend is also available as a legacy-free variant, bootstrapped from the legacy-free distribution of OpenUI5 — the build without jQuery.sap.*, synchronous APIs and the other deprecated globals. Which version it loads is pinned in the frontend's bootstrap (1.142.0-legacy-free in tools/app2app_v2/patch-v2.mjs of the framework repository today); the branches below carry it.
What is UI5 Legacy-Free?
*-legacy-free is a parallel distribution of OpenUI5/SAPUI5 (starting with the 1.136.x line) that ships the same controls and APIs as the regular 1.x build, but with everything deprecated removed up front. In practice that means no jQuery.sap.*, no sap.ui.getCore(), no synchronous module loading (sap.ui.requireSync, sync XHR), no global view/controller factories, no jQuery bundled into the core, and none of the compatibility shims that 1.x kept around for backwards compatibility.
UI5 2.x enforces exactly this surface, so the legacy-free build is a preview of it on a 1.x release: what runs on it runs on 2.x, and what breaks on it would break on 2.x. The abap2UI5 frontend and its custom controls are held to that surface by the UI5_2X check of the framework's CI, and the v2 branches are how an installation runs on it today.
Installation
The legacy-free frontend ships as the v2 branches of the frontend repository. Pull the branch that matches your system into your ABAP system with abapGit and activate — there is no separate build step:
| Branch | System | UI5 |
|---|---|---|
cloud_v2 | S/4 Public Cloud, BTP ABAP Environment | legacy-free (UI5 2.x preview) |
standard_v2 | S/4 Private Cloud, S/4 On-Premise | legacy-free (UI5 2.x preview) |
The v2 branches install the frontend under the same z2ui5 name as the classic branches. To evaluate the legacy-free frontend side by side with the classic one in the same system, run abap2UI5's frontend_deploy workflow with a branch name of the form standard_v2_<name>: it generates that branch of the frontend repository with the whole deployment identity (BSP, ICF nodes, handler class) under a different name. This is for the BSP of standard_v2; the frontend repository has the details.