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/* @flow */
import VNode from '../vnode'
import { createFnInvoker } from './update-listeners'
import { remove, isDef, isUndef, isTrue } from 'shared/util'
export function mergeVNodeHook (def: Object, 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
}