copy-webpack-plugin is not designed to copy files generated during the build process. Instead, it is meant to copy files that already exist in the source tree, as part of the build process.

NOTE: Swagger Core 2.X produces OpenApi 3.0 definition files. If you're looking for swagger 1.5.X and OpenApi 2.0, please refer to 1.5.X JAX-RS Setup and [Annotations ...