Column
arc-data-table's declarative column definition — one element per column.
<arc-column>Column was removed in v4.0.0. It is not published, and<arc-column> no longer resolves to anything. This page is here so the link still answers.
Why
Its only consumer was arc-data-table, and arc-data-grid takes its columns as an array rather than as slotted children, so there is no element for it to migrate to. It goes with its parent.
Use instead
- Data GridOne `columns` array entry per element; the field names carry over.
The full entry, with the mechanical fix, is inMIGRATION.md.