addChild.ts

import { PartialBy } from '../../../type-utils';
import {
  PrefabComponentOption,
  ValueDefault,
  ValueRef,
} from '../../types/options';

type OptionProducer = (key: string) => PrefabComponentOption;

// typescript issue #36981
// Omit is currently desctructive to union/extended types see
// So we have to Omit each variant as a work around
type RedundantKeys = 'type' | 'key' | 'label';
type Attributes =
  | PartialBy<Omit<ValueDefault, RedundantKeys>, 'value'>
  | Omit<ValueRef, RedundantKeys>;

const defaultAttributes = {
  value: {},
};

export const addChild =
  (label: string, attrs: Attributes = {}): OptionProducer =>
  (key) => ({
    ...defaultAttributes,
    ...attrs,
    key,
    type: 'ADD_CHILD',
    label,
  });