No name was provided for external module

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This is caused because you have an external dependency and you need to declare the name used so that the rollup knows what to look for when building the UMD bundle of my-core.

To fix the warning declare your my-data in ng-package.json

{
  "$schema": "../../node_modules/ng-packagr/ng-package.schema.json",
  "dest": "../../dist/my-core",
  "lib": {
    "entryFile": "src/public-api.ts",
    "umdModuleIds": {
      "my-data": "my-data"
    }
  }
}

I believe this is because since all dependencies are treated as external and your my-data isn’t installed through something like npm you need to declare the UMD module id that’s expected. See https://github.com/ng-packagr/ng-packagr/blob/master/docs/dependencies.md#resolving-umd-module-identifiers

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