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mergeVNodeHook() — vue Function Reference

Architecture documentation for the mergeVNodeHook() function in merge-hook.ts from the vue codebase.

Function typescript CoreRuntime VNodePatch calls 5

Entity Profile

Dependency Diagram

graph TD
  7d583d18_9b13_ab67_6ea8_ecb63c1af2ff["mergeVNodeHook()"]
  47c14f28_c1ca_52d4_cc59_404156ff9d1e["remove()"]
  7d583d18_9b13_ab67_6ea8_ecb63c1af2ff -->|calls| 47c14f28_c1ca_52d4_cc59_404156ff9d1e
  299f2646_f776_9b7d_1179_7b9087b1e66c["isUndef()"]
  7d583d18_9b13_ab67_6ea8_ecb63c1af2ff -->|calls| 299f2646_f776_9b7d_1179_7b9087b1e66c
  afbc409e_c4ce_bb75_099b_f86fb104602c["createFnInvoker()"]
  7d583d18_9b13_ab67_6ea8_ecb63c1af2ff -->|calls| afbc409e_c4ce_bb75_099b_f86fb104602c
  5b855538_2046_796e_16f9_7327a61399cb["isDef()"]
  7d583d18_9b13_ab67_6ea8_ecb63c1af2ff -->|calls| 5b855538_2046_796e_16f9_7327a61399cb
  c0051429_b95b_daa0_fc77_989c8344497d["isTrue()"]
  7d583d18_9b13_ab67_6ea8_ecb63c1af2ff -->|calls| c0051429_b95b_daa0_fc77_989c8344497d
  style 7d583d18_9b13_ab67_6ea8_ecb63c1af2ff fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

src/core/vdom/helpers/merge-hook.ts lines 5–40

export function mergeVNodeHook(
  def: Record<string, any>,
  hookKey: string,
  hook: Function
) {
  if (def instanceof VNode) {
    def = def.data!.hook || (def.data!.hook = {})
  }
  let invoker
  const oldHook = def[hookKey]

  function wrappedHook() {
    hook.apply(this, arguments)
    // important: remove merged hook to ensure it's called only once
    // and prevent memory leak
    remove(invoker.fns, wrappedHook)
  }

  if (isUndef(oldHook)) {
    // no existing hook
    invoker = createFnInvoker([wrappedHook])
  } else {
    /* istanbul ignore if */
    if (isDef(oldHook.fns) && isTrue(oldHook.merged)) {
      // already a merged invoker
      invoker = oldHook
      invoker.fns.push(wrappedHook)
    } else {
      // existing plain hook
      invoker = createFnInvoker([oldHook, wrappedHook])
    }
  }

  invoker.merged = true
  def[hookKey] = invoker
}

Domain

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Calls

Source

Frequently Asked Questions

What does mergeVNodeHook() do?
mergeVNodeHook() is a function in the vue codebase.
What does mergeVNodeHook() call?
mergeVNodeHook() calls 5 function(s): createFnInvoker, isDef, isTrue, isUndef, remove.

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