vue3-yuanma/packages/runtime-core/src/compat/instance.ts

import { extend, NOOP } from '@vue/shared'
import { PublicPropertiesMap } from '../componentPublicInstance'
import { getCompatChildren } from './instanceChildren'
import {
  DeprecationTypes,
  assertCompatEnabled,
  checkCompatEnabled,
  isCompatEnabled
} from './compatConfig'
import { off, on, once } from './instanceEventEmitter'
import { getCompatListeners } from './instanceListeners'
import { shallowReadonly } from '@vue/reactivity'
import { legacySlotProxyHandlers } from './component'

export function installCompatInstanceProperties(map: PublicPropertiesMap) {
  const set = (target: any, key: any, val: any) => {
    target[key] = val
  }

  const del = (target: any, key: any) => {
    delete target[key]
  }

  extend(map, {
    $set: i => {
      assertCompatEnabled(DeprecationTypes.INSTANCE_SET, i)
      return set
    },

    $delete: i => {
      assertCompatEnabled(DeprecationTypes.INSTANCE_DELETE, i)
      return del
    },

    $mount: i => {
      assertCompatEnabled(
        DeprecationTypes.GLOBAL_MOUNT,
        null /* this warning is global */
      )
      // root mount override from ./global.ts in installCompatMount
      return i.ctx._compat_mount || NOOP
    },

    $destroy: i => {
      assertCompatEnabled(DeprecationTypes.INSTANCE_DESTROY, i)
      // root destroy override from ./global.ts in installCompatMount
      return i.ctx._compat_destroy || NOOP
    },

    // overrides existing accessor
    $slots: i => {
      if (
        isCompatEnabled(DeprecationTypes.RENDER_FUNCTION, i) &&
        i.render &&
        i.render._compatWrapped
      ) {
        return new Proxy(i.slots, legacySlotProxyHandlers)
      }
      return __DEV__ ? shallowReadonly(i.slots) : i.slots
    },

    $scopedSlots: i => {
      assertCompatEnabled(DeprecationTypes.INSTANCE_SCOPED_SLOTS, i)
      return __DEV__ ? shallowReadonly(i.slots) : i.slots
    },

    // overrides existing accessor
    $attrs: i => {
      if (__DEV__ && i.type.inheritAttrs === false) {
        checkCompatEnabled(DeprecationTypes.INSTANCE_ATTRS_CLASS_STYLE, i)
      }
      return __DEV__ ? shallowReadonly(i.attrs) : i.attrs
    },

    $on: i => on.bind(null, i),
    $once: i => once.bind(null, i),
    $off: i => off.bind(null, i),

    $children: getCompatChildren,
    $listeners: getCompatListeners
  } as PublicPropertiesMap)
}