angular-cn/packages/elements/schematics/collection.json

{
  "$schema": "../node_modules/@angular-devkit/schematics/collection-schema.json",
  "schematics": {
    "ng-add": {
      "description": "Adds the document-register-element polyfill.",
      "factory": "./ng-add",
      "schema": "ng-add/schema.json"
    }
  }
}