Is it legal to define custom ERROR rules?

[Kyuuhachi]

I find that it sometimes greatly helps error recovery to define rules like below, to signal that something is invalid syntax but we can continue parsing without bringing in the whole error recovery mechanism.

		string: $ => seq(
			'"',
			repeat(choice(
				$.string_content,
				$.string_escape,
				alias(/\\/, $.ERROR),
			)),
			'"',
		),
		string_content: $ => token.immediate(prec(1, /[^\\"\n]+/)),
		string_escape:  $ => token.immediate(/\\[\\"n]/),

But does this produce a functional ERROR node as seen by ts_node_has/is_error, or do "real" ERROR nodes have some magic tag?

Also somewhat relatedly, is there any way to prohibit a token from participating in error recovery? Because the aforementioned string_content token matches almost everything, which is Not Great for recovery. I could use an external scanner, but that's a rather awkward workaround.