If single, specifies that the target YAML documents contain only one document in the target file(s). If more than one document stream exists in the target YAML file(s), set documentMode: 'multi'.

All YAML files will be parsed by default, but you can also specifically include files

All YAML files will be parsed by default, but you can also specifically exclude files

If true, specifies that the data in the target YAML file(s) contain trusted data and should be loaded normally. If false, data is assumed to be untrusted and will be loaded using safety methods.

A function which can optionally mutate parsed YAML. The function should return the mutated object, or undefined which will make no changes to the parsed YAML.