Hi 👋 I need to create a custom mapper plugin for a very specific anonymization use-case. I don’t find any documentation or tutorial to get started. Any tips on how to get started?

Yeah it doesnt look like theres much in the docs for this yet. I'd mostly follow the SDK docs for getting started with a tap/target https://sdk.meltano.com/en/latest/dev_guide.html#building-a-new-tap-or-target but using the mapper cookiecutter template instead. Then I'd look at some existing mappers for hints, check out https://github.com/pnadolny13/mapper-generic, https://github.com/MeltanoLabs/meltano-map-transform, and https://github.com/MeltanoLabs/map-gpt-embeddings. The mapper-generic might actually work for you out of the box if youre only doing minor stuff, its relatively new though so definitely do some testing.