Chartjs-Drill Down Chart find Index returns -1

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the type of myData is the type of chartData, which is number[]. findIndex will iterate on numbers which has no .chartData property.

const x = myData.findIndex(i => i >= 0);

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"chartData" is not a property of i.
"i" within the findIndex callback is an entry of "myData".
So "i.chartData" is wrong.

I don’t know the actual context but try to replace "i.chartData" with "i" only.