Column '{colId}' uses decoration 'icon' without a 'name', 'bands' or 'iconSet'. Give an icon name, a value->name map, a bands list, or a built-in iconSet ({sets}).

Warnings reference › dec-icon:*

Identifier

dec-icon:*

Raised by

The grid (rendering)

Since

1.16.0

What happened

An icon decoration takes its glyph from one of three places - a static or value-mapped name, a bands list, or a built-in iconSet - and none of them was given, so there is no way to choose a glyph and nothing is drawn. Only the absence of all three is reported; any one of them is enough.

The fix

Give one of the three.

The smallest fix

cell: { decoration: { type: 'icon', iconSet: 'traffic', bands: [{ min: 0, icon: 'circle-red' }] } }

Reference

Covered in full at the API reference.