angular-cn/aio/content/examples/schematics-for-libraries/projects/my-lib/schematics/collection.1.json

{
  "$schema": "../../../node_modules/@angular-devkit/schematics/collection-schema.json",
  "schematics": {
    "ng-add": {
      "description": "Add my library to the project.",
      "factory": "./ng-add/index#ngAdd"
    }
  }
}