addSourceType method
Adds a/// custom source type*(#Custom Sources), making it available for use with
{@link MapboxMap#addSource}.
@private
@param {string} name The name of the source type; source definition objects use this name in the {type: ...}
field.
@param {Function} SourceType A {@link Source} constructor.
@param {Function} callback Called when the source type is ready or with an error argument if there is an error.
Implementation
addSourceType(String name, dynamic sourceType, Function callback) =>
jsObject.addSourceType(name, sourceType, callback);