chart measure fn {fn} is not a known aggregation; using '{default}'. Supported: {list}.

Warnings reference › chart:measure:fn:*

Identifier

chart:measure:fn:*

Raised by

Charts

Since

1.31.0

What happened

A measure named an aggregation that does not exist. The chart falls back to the default aggregation and still draws - which is exactly the danger, because a chart drawn from a mistyped fn looks plausible and is wrong. That is why it is named, with the value and the supported set, rather than left to be discovered.

The fix

Use one of the aggregations listed in the message.

The smallest fix

measures: [{ col: 'amount', fn: 'sum' }]

Reference

Covered in full at the API reference.