Multiple templates declared in one .vue file - vue.js

Question

I have a component inside a .vue file that can benefit from reusing a chunk of code. I know I can move that code to a separate .vue file and import it as a new component. However, this component would not be used anywhere else and I'd like to avoid cluttering the directory. Is it possible to declare this component's template inside the parent without using the in-code template:"<div>.....</div>" stuff?
This is the idea:
<template>
<div>
...some html here...
<div v-for="item in items">
{{item.name}}:
<div v-if="item.available">YES!</div>
<div v-else>NO :(</div>
</div>
...some other components and data here...
<div v-for="item in items">
{{item.name}}:
<div v-if="item.available">YES!</div>
<div v-else>NO :(</div>
</div>
</div>
</template>
I would like to be able to do something like this:
<template>
<div>
...some html here...
<div v-for="item in items">
<itemizer inline-template v-model="item">
{{value.name}}:
<div v-if="value.available">YES!</div>
<div v-else>NO :(</div>
</itemizer>
</div>
...some other components and data here...
<div v-for="item in items">
<itemizer v-model="item"/>
</div>
</div>
</template>
However, from what I understand this is not possible.

Answer 1

Unfortunately this pattern does not appear to be supported by the creator of Vue:
I personally feel the syntax is less maintainable than [Single File Components]
Note that we want to keep the SFC syntax as consistent possible, because it involves a big ecosystem of tools that need to support any new features added (e.g. Vetur would need to do something very different for handling SFCs with multiple scripts/templates). The proposed syntax, IMO, does not justify adding the new syntax.
https://github.com/vuejs/vue/pull/7264#issuecomment-352452213
That's too bad, as even beyond flexibility and developer choice, there is a good argument for inlining small functions that are not used by other components in order to reduce complexity. It's a common pattern in React and does not inhibit Single File Components when they're needed. In fact it allows gradual migration as inline components grow.
Here's one of the only resources currently that offers some potential workarounds:
https://codewithhugo.com/writing-multiple-vue-components-in-a-single-file/
I've tried them all and am not satisfied with any of them at this time. At best you can set runtimerCompiler: true and use template strings, but it'll add 10KB to your bundle and you'll likely miss out on full syntax highlighting available in the <template> element. Maybe you can hack Teleport, but I have not made a dedicated attempt.

Answer 2

Actually, this should work. Just register your Vue inline-template like this in the section of your parent .vue file:
<template>
<div v-for="item in items">
<test-template :item="item">
<h1>{{item.text}}</h1>
</test-template>
</div>
</template>
<script>
Vue.component('test-template', {
template:'#hello-world-template',
props: {
item: Object
}
});
export default {...}
</script>
In your parent HTML file, put this:
<script type="text/x-template" id="hello-world-template">
<p>Hello hello hello</p>
</script>

Answer 3

With vue3 there are multiple options:
with vue-jsx you can just declare a component in your script setup section and use that
const Named = defineComponent(() => {
const count = ref(0)
const inc = () => count.value++
return () => (
<button class="named" onClick={inc}>
named {count.value}
</button>
)
})
There is another option described by Michael Thiessen here
Also you can have multiple render function components in one file:
https://staging.vuejs.org/guide/extras/render-function.html

Answer 4

Although it is not supported in Vue core yet, there is a way to use this through vue macros project. See discussion here