commonPrefixes property
All of the keys rolled up into a common prefix count as a single return when calculating the number of returns.
A response can contain CommonPrefixes only if you specify a
delimiter.
CommonPrefixes contains all (if there are any) keys between
Prefix and the next occurrence of the string specified by a
delimiter.
CommonPrefixes lists keys that act like subdirectories in the
directory specified by Prefix.
For example, if the prefix is notes/ and the delimiter is a
slash (/) as in notes/summer/july, the common
prefix is notes/summer/. All of the keys that roll up into a
common prefix count as a single return when calculating the number of
returns.
Implementation
final List<CommonPrefix>? commonPrefixes;