How to convert to Quaternion to AxisAngle

How to convert to Quaternion to AxisAngle?

I found the document here.

is this code also for three.js?

Yes, it seems it works as expected, see Edit fiddle - JSFiddle - Code Playground

However, the function in the fiddle is not complete. It’s necessary to handle the edge cases when the angle is 0 or 180 degrees.

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Here I have used it for visualization
Quaternion - Axis, Angle Visualization

Try it directly: quaternion
and see source.
( From the Collection of examples from )