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The grid (rendering) ยท console.warn

Column '{colId}' cell.render must be a name, a function or a class.

Printed by The grid (rendering), prefixed [lattice], since 1.0.1.

Warnings referencerender-type:*

Identifier
render-type:*
Raised by
The grid (rendering)
Since
1.0.1

What happened

cell.render was some other kind of value - an object, a number - so no renderer was resolved and the column renders its formatted text.

The fix

Pass a registered name, a (params) => node|string function, or a component class with render/destroy.

Reference

Covered in full at the API reference.