There is not a PointLight.castShadow property, but there is a SpotLight.castShadow property.
It seems like all lights that can cast shadows should have this same option to enable/disable shadow casting.
Why isn’t this the case?
Maybe it’s not in the docs, but that type of light has this property.
For example: three.js examples , line 56 in the source code.
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@marquizzo fixed the issue 
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My bad also, I forgot castShadow comes from Object3D, shared with non-lights too (although I don’t think all objects can castShadow, so probably wouldn’t put it there myself).