Function extend

packages/core/src/plugin/plugin-extend.ts:65–94

(
  extendMap: Record<T, PluginExtendClass[T]>,
  extendClass: T,
  properties: Record<PropertyKey, any> | (PropertyDescriptorMap & ThisType<InstanceType<PluginExtendClass[T]>>),
)

 * @param properties 扩展属性
 */
export const extend = <T extends keyof PluginExtendClass>(
  extendMap: Record<T, PluginExtendClass[T]>,
  extendClass: T,
  properties: Record<PropertyKey, any> | (PropertyDescriptorMap & ThisType<InstanceType<PluginExtendClass[T]>>),
) => {
  const newProperties: PropertyDescriptorMap & ThisType<InstanceType<PluginExtendClass[T]>> = {}
  const prototype = extendMap[extendClass].prototype
  let hasMobXProperties = false

  for (const key in properties) {
    const property = properties[key]

    // 检查是否为 MobX 扩展属性
    if (isMobxExtendProperty(property)) {
      addMobxExtendProperty(prototype, key, property.config)
      hasMobXProperties = true
      continue
    }

    if (typeof property === 'function') {
      newProperties[key] = {
        value: property,
      }
    } else {
      newProperties[key] = property
    }
  }

  Object.defineProperties(prototype, newProperties)
}