All files / runtime-core/src componentSlots.ts

97.4% Statements 75/77
95.74% Branches 45/47
100% Functions 10/10
97.18% Lines 69/71

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 20984x 84x             84x                 84x 84x 84x 84x 84x 84x                                                             266x   84x 291x       84x         110x 258x             258x     110x 110x     84x         140x 140x 223x 115x 115x 110x 5x 4x             4x         4x 4x         84x       29x         3x         29x 29x     84x       1565x 180x 180x     54x   54x   126x             1385x 1385x 11x     1565x     84x         129x 129x 129x 129x 23x 23x   9x     5x 4x             4x         4x 2x       14x 14x   23x 106x   18x 18x       129x 128x 43x 6x          
import { ComponentInternalInstance, currentInstance } from './component'
import {
  VNode,
  VNodeNormalizedChildren,
  normalizeVNode,
  VNodeChild,
  InternalObjectKey
} from './vnode'
import {
  isArray,
  isFunction,
  EMPTY_OBJ,
  ShapeFlags,
  extend,
  def,
  SlotFlags
} from '@vue/shared'
import { warn } from './warning'
import { isKeepAlive } from './components/KeepAlive'
import { ContextualRenderFn, withCtx } from './componentRenderContext'
import { isHmrUpdating } from './hmr'
import { DeprecationTypes, isCompatEnabled } from './compat/compatConfig'
import { toRaw } from '@vue/reactivity'
 
export type Slot = (...args: any[]) => VNode[]
 
export type InternalSlots = {
  [name: string]: Slot | undefined
}
 
export type Slots = Readonly<InternalSlots>
 
export type RawSlots = {
  [name: string]: unknown
  // manual render fn hint to skip forced children updates
  $stable?: boolean
  /**
   * for tracking slot owner instance. This is attached during
   * normalizeChildren when the component vnode is created.
   * @internal
   */
  _ctx?: ComponentInternalInstance | null
  /**
   * indicates compiler generated slots
   * we use a reserved property instead of a vnode patchFlag because the slots
   * object may be directly passed down to a child component in a manual
   * render function, and the optimization hint need to be on the slot object
   * itself to be preserved.
   * @internal
   */
  _?: SlotFlags
}
 
const isInternalKey = (key: string) => key[0] === '_' || key === '$stable'
 
const normalizeSlotValue = (value: unknown): VNode[] =>
  isArray(value)
    ? value.map(normalizeVNode)
    : [normalizeVNode(value as VNodeChild)]
 
const normalizeSlot = (
  key: string,
  rawSlot: Function,
  ctx: ComponentInternalInstance | null | undefined
): Slot => {
  const normalized = withCtx((...args: any[]) => {
    Iif (__DEV__ && currentInstance) {
      warn(
        `Slot "${key}" invoked outside of the render function: ` +
          `this will not track dependencies used in the slot. ` +
          `Invoke the slot function inside the render function instead.`
      )
    }
    return normalizeSlotValue(rawSlot(...args))
  }, ctx) as Slot
  // NOT a compiled slot
  ;(normalized as ContextualRenderFn)._c = false
  return normalized
}
 
const normalizeObjectSlots = (
  rawSlots: RawSlots,
  slots: InternalSlots,
  instance: ComponentInternalInstance
) => {
  const ctx = rawSlots._ctx
  for (const key in rawSlots) {
    if (isInternalKey(key)) continue
    const value = rawSlots[key]
    if (isFunction(value)) {
      slots[key] = normalizeSlot(key, value, ctx)
    } else if (value != null) {
      if (
        __DEV__ &&
        !(
          __COMPAT__ &&
          isCompatEnabled(DeprecationTypes.RENDER_FUNCTION, instance)
        )
      ) {
        warn(
          `Non-function value encountered for slot "${key}". ` +
            `Prefer function slots for better performance.`
        )
      }
      const normalized = normalizeSlotValue(value)
      slots[key] = () => normalized
    }
  }
}
 
const normalizeVNodeSlots = (
  instance: ComponentInternalInstance,
  children: VNodeNormalizedChildren
) => {
  if (
    __DEV__ &&
    !isKeepAlive(instance.vnode) &&
    !(__COMPAT__ && isCompatEnabled(DeprecationTypes.RENDER_FUNCTION, instance))
  ) {
    warn(
      `Non-function value encountered for default slot. ` +
        `Prefer function slots for better performance.`
    )
  }
  const normalized = normalizeSlotValue(children)
  instance.slots.default = () => normalized
}
 
export const initSlots = (
  instance: ComponentInternalInstance,
  children: VNodeNormalizedChildren
) => {
  if (instance.vnode.shapeFlag & ShapeFlags.SLOTS_CHILDREN) {
    const type = (children as RawSlots)._
    if (type) {
      // users can get the shallow readonly version of the slots object through `this.$slots`,
      // we should avoid the proxy object polluting the slots of the internal instance
      instance.slots = toRaw(children as InternalSlots)
      // make compiler marker non-enumerable
      def(children as InternalSlots, '_', type)
    } else {
      normalizeObjectSlots(
        children as RawSlots,
        (instance.slots = {}),
        instance
      )
    }
  } else {
    instance.slots = {}
    if (children) {
      normalizeVNodeSlots(instance, children)
    }
  }
  def(instance.slots, InternalObjectKey, 1)
}
 
export const updateSlots = (
  instance: ComponentInternalInstance,
  children: VNodeNormalizedChildren,
  optimized: boolean
) => {
  const { vnode, slots } = instance
  let needDeletionCheck = true
  let deletionComparisonTarget = EMPTY_OBJ
  if (vnode.shapeFlag & ShapeFlags.SLOTS_CHILDREN) {
    const type = (children as RawSlots)._
    if (type) {
      // compiled slots.
      if (__DEV__ && isHmrUpdating) {
        // Parent was HMR updated so slot content may have changed.
        // force update slots and mark instance for hmr as well
        extend(slots, children as Slots)
      } else Iif (optimized && type === SlotFlags.STABLE) {
        // compiled AND stable.
        // no need to update, and skip stale slots removal.
        needDeletionCheck = false
      } else {
        // compiled but dynamic (v-if/v-for on slots) - update slots, but skip
        // normalization.
        extend(slots, children as Slots)
        // #2893
        // when rendering the optimized slots by manually written render function,
        // we need to delete the `slots._` flag if necessary to make subsequent updates reliable,
        // i.e. let the `renderSlot` create the bailed Fragment
        if (!optimized && type === SlotFlags.STABLE) {
          delete slots._
        }
      }
    } else {
      needDeletionCheck = !(children as RawSlots).$stable
      normalizeObjectSlots(children as RawSlots, slots, instance)
    }
    deletionComparisonTarget = children as RawSlots
  } else if (children) {
    // non slot object children (direct value) passed to a component
    normalizeVNodeSlots(instance, children)
    deletionComparisonTarget = { default: 1 }
  }
 
  // delete stale slots
  if (needDeletionCheck) {
    for (const key in slots) {
      if (!isInternalKey(key) && !(key in deletionComparisonTarget)) {
        delete slots[key]
      }
    }
  }
}