@angular-devkit/build-ng-packagr/builders.json

Angular Build Architect for ng-packagr

{
  "$schema": "../architect/src/builders-schema.json",
  "builders": {
    "build": {
      "implementation": "./src/build",
      "schema": "./src/build/schema.json",
      "description": "Build a library with ng-packagr."
    }
  }
}