Axis options can not be cleared with `undefined`

[bre1470]

If I set tickPositions to null, it magically works, but TS doesn't like it, null is not allowed.
Setting single tickPositions to undefined is working with Highcharts 9.3.1.

See: highcharts/highcharts-react#110

Demo: https://jsfiddle.net/43w5ch2L/

Workaround: https://jsfiddle.net/bre1470/tr6shfy4/
Setting tickPositions options to [] is working with rendering of Highcharts 9.3.1, though the previous options are still accessible via Axis.options.

[bre1470]

The same problem exists with max and min options.

[TorsteinHonsi]

but TS doesn't like it, null is not allowed

Should we allow null in the type definitions rather than change the behaviour?

[bre1470]

I agree in the sense, that we should continue to support null for backward compatibility, but officially we should only advertise undefined in documentation and declarations.

Otherwise it would get inconsistent with the behaviour in all other parts. It is also easier to handle undefined than null. For example you do not end up with functions that have optional parameter with a type of Array<number>|null|undefined, where the last two have the exact same result.

[bre1470]

Probably a related issue: #10525

[stale]

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