@type t() :: %Envoy.Config.Core.V3.DataSource{
__unknown_fields__: [
{field_number :: integer(), Protobuf.Wire.Types.wire_type(),
value :: term()}
],
specifier:
{:filename, String.t()}
| {:inline_bytes, binary()}
| {:inline_string, String.t()}
| {:environment_variable, String.t()}
| nil
}