List of fields to be appended to entries automatically. It consists of an object where keys correspond to the names of the fields being created and values being of mixed type. If values are objects, Staticman will look for a type and options keys inside and perform different operations based on their type; otherwise, the value will be used directly as the content of the generated field.
Populate the value with the current date.
iso8601 [default] date as a string like: ‘2017-03-03T23:28:14.272Z’
timestamp milliseconds since 1970/01/01
timestamp-seconds seconds since 1970/01/01
Transform the value via slug (with the default options), then converting to lower case.