Is it possible to check the following? I didn't get from the code:

:type="condition ? 'tertiary' : 'error'"

:type="buttonType"

const buttonType = computed(() => condition ? 'tertiary' : 'error')

@Antreesy this :type="\'secondary\'" should already be catched by other rules, you should never have useless v-bind like this. Should already catched by vue/no-useless-v-bind

Also what I did not implement to keep it simple: Aliasing the component.
Sometimes (for what reason ever) people alias the component like:

<template
<Button ...>
</template>
<script setup>
import Button from '@nextcloud/vue/components/NcButton'
</script>

Not sure if this is useful

Aliasing the component

need to check ImportDeclaration as well then =), but then there goes a ton of fun with cases, like import { NcButton as Button } from '@nextcloud/vue'. Not sure it's worth it.

I'd be happy to cover 'ConditionalExpression' at least, then it's not much left to check manually

for what reason ever

It's from the time when there was no Nc* prefix yet, and then migrated by updating the import without changing JS/template

Not sure if this is useful

I'd say if you do not follow styleguide - that's your problem 😀
Component should be imported, used, and have a module with the same single name

@Antreesy I implemented your suggestion, so as you can see from the changed tests now also conditional variants are covered.
@ShGKme native-type is now always migrated.

New approach fails at Talk:

TypeError: Cannot read properties of null (reading 'name')
Occurred while linting /home/user/nextcloud-docker-dev/workspace/server/apps-extra/spreed/src/components/AdminSettings/RecordingServer.vue:53
Rule: "vue/no-child-content"
    at file:///home/user/nextcloud-docker-dev/workspace/server/apps-extra/spreed/node_modules/@nextcloud/eslint-config/dist/plugins/nextcloud-vue/rules/no-deprecated-props.js:19:80
    at Array.find (<anonymous>)
    at VElement[name="ncbutton"] VAttribute:has(VIdentifier[name="type"]) (file:///home/user/nextcloud-docker-dev/workspace/server/apps-extra/spreed/node_modules/@nextcloud/eslint-config/dist/plugins/nextcloud-vue/rules/no-deprecated-props.js:18:62)

Failing button:

		<NcButton v-show="!loading"
			type="tertiary"
			:title="t('spreed', 'Delete this server')"
			:aria-label="t('spreed', 'Delete this server')"
			@click="removeServer">
			<template #icon>
				<IconDelete :size="20" />
			</template>
		</NcButton>

Failing button

Thats v-show which is a directive key without argument.
Fixed that.