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

import { extend, NOOP, toDisplayString, toNumber } from '@vue/shared'
import { PublicPropertiesMap } from '../componentPublicInstance'
import { getCompatChildren } from './instanceChildren'
import {
  DeprecationTypes,
  assertCompatEnabled,
  isCompatEnabled
} from './compatConfig'
import { off, on, once } from './instanceEventEmitter'
import { getCompatListeners } from './instanceListeners'
import { shallowReadonly } from '@vue/reactivity'
import { legacySlotProxyHandlers } from './component'
import { compatH } from './renderFn'
import { createCommentVNode, createTextVNode } from '../vnode'
import { renderList } from '../helpers/renderList'
import {
  legacyBindObjectListeners,
  legacyBindObjectProps,
  legacyCheckKeyCodes,
  legacyRenderSlot,
  legacyRenderStatic,
  legacyresolveScopedSlots
} from './renderHelpers'

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
    },

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

    $children: getCompatChildren,
    $listeners: getCompatListeners,

    // v2 render helpers
    $createElement: () => compatH,
    _self: i => i.proxy,
    _c: () => compatH,
    _n: () => toNumber,
    _s: () => toDisplayString,
    _l: () => renderList,
    _t: i => legacyRenderSlot.bind(null, i),
    _b: () => legacyBindObjectProps,
    _e: () => createCommentVNode,
    _v: () => createTextVNode,
    _m: i => legacyRenderStatic.bind(null, i),
    _g: () => legacyBindObjectListeners,
    _u: () => legacyresolveScopedSlots,
    _k: i => legacyCheckKeyCodes.bind(null, i)
  } as PublicPropertiesMap)
}