Vuejs nested slots: how to pass slot to grandchild - vue.js

Question

I use different vuetify components, for example v-menu. It has a template like this:
<v-menu>
<a slot="activator">menu</a>
<v-list>
<v-list-tile>Menu Entry 1</v-list-tile>
<v-list-tile>Menu Entry 2</v-list-tile>
</v-list>
</v-menu>
Suppose I want to add another wrapper around it. That is my special menu component that has some predefined menu options. And I want it to has an activator slot as well. And the last should be somehow assigned to the original v-menu activator slot. Is it possible?
Example:
// index.vue:
<template>
<my-special-menu>
<button>My special menu trigger</button>
</my-special-menu>
</template>
// MySpecialMenu.vue
<template>
<v-menu>
<slot slot="activator"/> <-- I don't know how to write this line
<v-list>...</v-list>
</v-menu>
</template>
<slot slot="activator"> is an incorrect equation. The goal is to pull the content from the parent (that is <button>..</button> in the example), and use it as slot="activator" in v-menu.
I can write it like this:
<v-menu>
<a slot="activator"><slot/></a>
...
</v-menu>
But this case the result template will be:
<div class="v-menu__activator">
<a>
<button>My special menu trigger</button>
</a>
</div>
That's not exactly what I want. Is it possible to get rid off <a> wrapper here?
Update:
We can use a construction like <template slot="activator"><slot name="activator"/></template> to throw some slot to a grand child. But what if we have multiple slots and we want to proxy them all? That's like inheritAttrs and v-bind="$attrs" for slots. Is it currently possible?
For example, there's <v-autocomplete> component in vuetify that has append, prepend, label, no-data, progress, item, selection etc slots. I write some wrapper component around this, it currently looks like:
<template>
<v-autocomplete ..>
<template slot="append"><slot name="append"/></template>
<template slot="prepend"><slot name="prepend"/></template>
<template slot="label"><slot name="label"/></template>
...
<template slot="item" slot-scope="props"><slot name="item" v-bind="props"/></template>
</v-autocomplete>
</template>
Is it possible to avoid all slots enumeration here?

Answer 1

If you put the slot attribute on a html element, that html element is passed to the child component to fill the slot with that name. If you don't want to pass along a html element, you can use slot on a template tag within your component. A template tag groups elements, but does not render to a html element, which is perfect here. You can use template tags also for other things, such as to group elements in a v-if for example, or to repeat multiple elements with a v-for.
// App.vue
<template>
<div id="app">
<test>
<template slot="activator">
Click <b>me</b>!
</template>
</test>
</div>
</template>
// Test.vue
<template>
<div class="wrapper">
<grand-child>
<template slot="activator">
<slot name="activator"></slot>
</template>
</grand-child>
This is some text
</div>
</template>
// GrandChild.vue
<template>
<div>
<a href="#" #click="toggle = !toggle">
<slot name="activator">Default</slot>
</a>
<div v-if="toggle">This appears and disappears</div>
</div>
</template>
Edit: If you want to do this for arbitrary slots, this is also possible. this.$slots contains the slots and their content, so with something like the following, you can pass the slot content to a slot with the same name:
<grand-child>
<template v-for="(_, slot) in $slots">
<template :slot="slot">
<slot :name="slot"></slot>
</template>
</template>
</grand-child>
For completeness sake, scoped slots can be accessed through $scopedSlots and be propagated like so:
<grand-child>
<template v-for="(_, slot) in $scopedSlots" v-slot:[slot]="props">
<slot :name="slot" v-bind="props" />
</template>
</grand-child>
source and comment

Answer 2

I had EsLint errors because of the depreciated :slot and $scopedSlots attributes.
So I combined both of #Sumurai8 answers like this and it works great:
<template v-for="(_, slot) in $slots" v-slot:[slot]>
<slot :name="slot"></slot>
</template>

Answer 3

If you have both named and unnamed slots with props:
Vue 3
<template v-for="(_, name) in $slots" #[name]="slotData">
<slot :name="name" v-bind="slotData || {}" />
</template>
Typescript version
<template v-for="(_, name) in ($slots as {})" #[name]="slotData">
<slot :name="name" v-bind="slotData || {}" />
</template>