Generated message classes cannot be subclassed because of missing 'export' about protobuf-ts HOT 1 OPEN

Hey Petri, apologies for the late response. Subclasses are less useful than expected in generated code. You would be able to subclass a message, but for it to take effect, it needs to be used in all places where the original is used in generated code.

So simply exporting the classes will likely not enable this feature. It would be really fantastic if TypeScript had something like csharp's extensions methods, but we're very unlikely to ever get an exact equivalent because of TypeScript's nature.

Depending on the behavior you want to add, patching the original can be a viable alternative. TypeScript has declaration merging, which lets you extend the types as well. This approach has downsides too, but maybe it would be a good idea to simply give an example in this repository.

from protobuf-ts.