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packages/frontend/src/components/global/NestedRouterView.vue

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+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<Suspense :timeout="0">
+	<component :is="currentPageComponent" :key="key" v-bind="Object.fromEntries(currentPageProps)"/>
+
+	<template #fallback>
+		<MkLoading/>
+	</template>
+</Suspense>
+</template>
+
+<script lang="ts" setup>
+import { inject, onBeforeUnmount, provide, ref, shallowRef } from 'vue';
+import type { IRouter, Resolved } from '@/nirax.js';
+import MkLoadingPage from '@/pages/_loading_.vue';
+import { DI } from '@/di.js';
+
+const props = defineProps<{
+	router?: IRouter;
+}>();
+
+const router = props.router ?? inject(DI.router);
+
+if (router == null) {
+	throw new Error('no router provided');
+}
+
+const currentDepth = inject(DI.routerCurrentDepth, 0);
+provide(DI.routerCurrentDepth, currentDepth + 1);
+
+function resolveNested(current: Resolved, d = 0): Resolved | null {
+	if (d === currentDepth) {
+		return current;
+	} else {
+		if (current.child) {
+			return resolveNested(current.child, d + 1);
+		} else {
+			return null;
+		}
+	}
+}
+
+const current = resolveNested(router.current)!;
+const currentPageComponent = shallowRef('component' in current.route ? current.route.component : MkLoadingPage);
+const currentPageProps = ref(current.props);
+const key = ref(router.getCurrentKey() + JSON.stringify(Object.fromEntries(current.props)));
+
+function onChange({ resolved, key: newKey }) {
+	const current = resolveNested(resolved);
+	if (current == null || 'redirect' in current.route) return;
+	currentPageComponent.value = current.route.component;
+	currentPageProps.value = current.props;
+	key.value = newKey + JSON.stringify(Object.fromEntries(current.props));
+}
+
+router.addListener('change', onChange);
+
+onBeforeUnmount(() => {
+	router.removeListener('change', onChange);
+});
+</script>