getParent type is incompatible with newest TS versions

[Validark]

In the latest version of TypeScript, this will give you a compile-time error:

function foo(node: ts.Identifier | ts.ExpressionWithTypeArguments) {
	node.getParent();
}

The errors look something like this:

This happens due to a change in the way TypeScript handles method unions. If you think this error is incorrect, perhaps a TypeScript issue should be made?

[dsherret]

I haven't figured out a way to fix this yet and I'm not sure it's possible in TS 3.6 without changing the method to always being nullable.

This is due to the issue you outlined here: microsoft/TypeScript#32506

[dsherret]

I'm so sad, but I'm probably going to do a code generation solution in the final declaration file to solve this :(

[dsherret]

Yeah, this solution is no fun, but I don't see any way around it. This will be fixed in version 4.0 (I hope to get a release out by Tuesday).