source_ property
Source is the build output to promote, as a path RELATIVE to your org's own storage space — never a URL and never a bucket. The org segment is prepended server-side from the validated principal, so the worst a hostile source can address is something your own org already owns.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? source_;