Module build failed: LoaderRunnerError: Module: '<path>/json-schema-apidoc-loader/lib/loader.js' is not a loader (must have normal or pitch function)

[schakko]

When accessing doca's generated index endpoint, it fails with the error
Module build failed: LoaderRunnerError: Module: '<path>/json-schema-apidoc-loader/lib/loader.js' is not a loader (must have normal or pitch function) (already mentioned in #15).

As far as I can tell, the loader definition inside the config.${ENV}.babel.js for json-schema-apidoc-loader seems to be no longer working because Webpack changed it's expected format. Please correct me, if I am wrong - I am no Webpack expert.