messageSetWireFormat property
Set true to use the old proto1 MessageSet wire format for extensions. This is provided for backwards-compatibility with the MessageSet wire format. You should not use this for any other reason: It's less efficient, has fewer features, and is more complicated.
The message must be defined exactly as follows: message Foo { option message_set_wire_format = true; extensions 4 to max; } Note that the message cannot have any defined fields; MessageSets only have extensions.
All extensions of your type must be singular messages; e.g. they cannot be int32s, enums, or repeated messages.
Because this is an option, the above two restrictions are not enforced by the protocol compiler.
Implementation
@$pb.TagNumber(1)
$core.bool get messageSetWireFormat => $_getBF(0);
Implementation
@$pb.TagNumber(1)
set messageSetWireFormat($core.bool v) { $_setBool(0, v); }