The domain name is js. See https://www.sphinx-doc.org/en/master/usage/domains/javascript.html.
The .. js:function:: directive, showing a JavaScript function or method.
href (string()) – An URI to the location of the resource.
callback – Gets called with the object.
errback – Gets called in case the request fails. And a lot of other text so we need multiple lines.
SomeError() – For whatever reason in that case.
Something.
The .. js:method:: directive (an alias for .. js:function::,
showing a function that is implemented as a method on a class object.
The .. js:class:: directive, showing a JavaScript object.
name (string()) – A name
num (number()) – An optional number
The .. js:data:: directive, showing a global variable or constant.
The .. js:attribute:: directive, showing an attribute name of object.