docs(getting-started): add transitions page

docs/content/1.getting-started/5.transitions.md

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+---
+navigation.icon: uil:moon-eclipse
+description: Nuxt leverages Vue's Transition component to apply transitions between pages and layouts.
+---
+
+# Transitions
+
+Nuxt leverages Vue's [`<Transition>`](https://vuejs.org/guide/built-ins/transition.html#the-transition-component) component to apply transitions between pages and layouts.
+
+## Page transitions
+
+Nuxt sets `{ name: 'page', mode: 'out-in' }` transition by default for all your [pages](/guide/directory-structure/pages).
+
+To start adding transition between your pages, add the following CSS to your [`app.vue`](/guide/directory-structure/app):
+
+::code-group
+
+```html [app.vue]
+<template>
+  <NuxtPage />
+</template>
+
+<style>
+.page-enter-active,
+.page-leave-active {
+  transition: all 0.4s;
+}
+.page-enter-from,
+.page-leave-to {
+  opacity: 0;
+  filter: blur(1rem);
+}
+</style>
+```
+
+```html [pages/index.vue]
+<template>
+  <div>
+    <h1>Home page</h1>
+    <NuxtLink to="/about">About page</NuxtLink>
+  </div>
+</template>
+```
+
+```html [pages/about.vue]
+<template>
+  <div>
+    <h1>About page</h1>
+    <NuxtLink to="/">Home page</NuxtLink>
+  </div>
+</template>
+```
+
+::
+
+This produces the following result when navigating between pages:
+
+<video controls class="rounded">
+  <source src="https://res.cloudinary.com/nuxt/video/upload/v1665061349/nuxt3/nuxt3-page-transitions_umwvmh.mp4" type="video/mp4">
+</video>
+
+To set a different transition for a page, set the `pageTransition` key in [`definePageMeta`](/api/utils/define-page-meta) of the page:
+
+::code-group
+
+```vue [pages/about.vue]
+<script setup lang="ts">
+definePageMeta({
+  pageTransition: {
+    name: 'rotate'
+  }
+})
+</script>
+```
+
+```html [app.vue]
+<template>
+  <NuxtPage />
+</template>
+
+<style>
+/* ... */
+.rotate-enter-active,
+.rotate-leave-active {
+  transition: all 0.4s;
+}
+.rotate-enter-from,
+.rotate-leave-to {
+  opacity: 0;
+  transform: rotate3d(1, 1, 1, 15deg);
+}
+</style>
+```
+
+::
+
+Moving to the about page will add the 3d rotation effect:
+
+<video controls class="rounded">
+  <source src="https://res.cloudinary.com/nuxt/video/upload/v1665063233/nuxt3/nuxt3-page-transitions-cutom.mp4" type="video/mp4">
+</video>
+
+## Layouts transitions
+
+Nuxt sets `{ name: 'layout', mode: 'out-in' }` transition by default for all your [layouts](/guide/directory-structure/layouts).
+
+To start adding transition between your pages, add the following CSS to your [`app.vue`](/guide/directory-structure/app):
+
+::code-group
+
+```html [app.vue]
+<template>
+  <NuxtLayout>
+    <NuxtPage />
+  </NuxtLayout>
+</template>
+
+<style>
+.layout-enter-active,
+.layout-leave-active {
+  transition: all 0.4s;
+}
+.layout-enter-from,
+.layout-leave-to {
+  filter: grayscale(1);
+}
+</style>
+```
+
+```html [layouts/default.vue]
+<template>
+  <div>
+    <pre>default layout</pre>
+    <slot />
+  </div>
+</template>
+
+<style scoped>
+div {
+  background-color: lightgreen;
+}
+</style>
+```
+
+```html [layouts/orange.vue]
+<template>
+  <div>
+    <pre>orange layout</pre>
+    <slot />
+  </div>
+</template>
+
+<style scoped>
+div {
+  background-color: #eebb90;
+  padding: 20px;
+  height: 100vh;
+}
+</style>
+```
+
+```html [pages/index.vue]
+<template>
+  <div>
+    <h1>Home page</h1>
+    <NuxtLink to="/about">About page</NuxtLink>
+  </div>
+</template>
+```
+
+```html [pages/about.vue]
+<script setup lang="ts">
+definePageMeta({
+  layout: 'orange'
+})
+</script>
+
+<template>
+  <div>
+    <h1>About page</h1>
+    <NuxtLink to="/">Home page</NuxtLink>
+  </div>
+</template>
+```
+
+::
+
+This produces the following result when navigating between pages:
+
+<video controls class="rounded">
+  <source src="https://res.cloudinary.com/nuxt/video/upload/v1665065289/nuxt3/nuxt3-layouts-transitions_c9hwlx.mp4" type="video/mp4">
+</video>
+
+Similar to `pageTransition`, you can apply a custom `layoutTransition` to the page component using `definePageMeta`:
+
+```vue [pages/about.vue]
+<script setup lang="ts">
+definePageMeta({
+  layout: 'orange',
+  layoutTransition: {
+    name: 'slide-in'
+  }
+})
+</script>
+```
+
+## Global settings
+
+You can customize these default transition names globally using `nuxt.config`.
+
+Both `pageTransition` and `layoutTransition` keys accept [`TransitionProps`](https://vuejs.org/api/built-in-components.html#transition) as JSON serializable values where you can pass the `name`, `mode` and other valid transition-props of the custom CSS transition.
+
+```ts [nuxt.config.ts]
+export default defineNuxtConfig({
+  pageTransition: {
+    name: 'fade',
+    mode: 'out-in' // default
+  },
+  layoutTransition: {
+    name: 'slide',
+    mode: 'out-in' // default
+  }  
+})
+```
+
+::alert{type="info"}
+If you change the `name` property, you also have to rename the CSS classes accordingly.
+::
+
+To override the global transition property, use the `definePageMeta` to define page or layout transitions for a single Nuxt page and override any page or layout transitions that are defined globally in `nuxt.config` file.
+
+```vue [pages/some-page.vue]
+<script setup lang="ts">
+definePageMeta({
+  pageTransition: {
+    name: 'bounce',
+    mode: 'out-in' // default
+  }
+})
+</script>
+```
+
+## Disable Transitions
+
+`pageTransition` and `layoutTransition` can be disabled for a specific route:
+
+```vue [pages/some-page.vue]
+<script setup lang="ts">
+definePageMeta({
+  pageTransition: false
+  layoutTransition: false
+})
+</script>
+```
+
+Or globally in the `nuxt.config`:
+
+```ts [nuxt.config.ts]
+defineNuxtConfig({
+  pageTransition: false,
+  layoutTransition: false
+})
+```
+
+## JavaScript Hooks
+
+For advanced use-cases, you can use JavaScript hooks to create highly dynamic and custom transitions for your Nuxt pages.
+
+This way presents perfect use-cases for JavaScript animation libraries such as [GSAP](https://greensock.com/gsap/) or [Tween.js](https://createjs.com/tweenjs).
+
+```vue [pages/some-page.vue]
+<script setup lang="ts">
+definePageMeta({
+  pageTransition: {
+    name: 'custom-flip',
+    mode: 'out-in',
+    onBeforeEnter: (el) => {
+      console.log('Before enter...')
+    },
+    onEnter: (el, done) => {},
+    onAfterEnter: (el) => {}
+  }
+})
+</script>
+```
+
+::alert{type="info"}
+Learn more about additional [JavaScript hooks](https://vuejs.org/guide/built-ins/transition.html#javascript-hooks) available in the `Transition` component.
+::
+
+## Dynamic Transitions
+
+To apply dynamic transitions using conditional logic, you can leverage inline [middleware](/guide/directory-structure/middleware) to assign a different transition name to `to.meta.pageTransition`.
+
+::code-group
+
+```html [pages/[id].vue]
+<script setup lang="ts">
+definePageMeta({
+  pageTransition: {
+    name: 'slide-right',
+    mode: 'out-in'
+  },
+  middleware (to, from) {
+    to.meta.pageTransition.name = +to.params.id > +from.params.id ? 'slide-left' : 'slide-right'
+  }
+})
+</script>
+
+<template>
+  <h1>#{{ $route.params.id }}</h1>
+</template>
+
+<style>
+.slide-left-enter-active,
+.slide-left-leave-active,
+.slide-right-enter-active,
+.slide-right-leave-active {
+  transition: all 0.2s;
+}
+.slide-left-enter-from {
+  opacity: 0;
+  transform: translate(50px, 0);
+}
+.slide-left-leave-to {
+  opacity: 0;
+  transform: translate(-50px, 0);
+}
+.slide-right-enter-from {
+  opacity: 0;
+  transform: translate(-50px, 0);
+}
+.slide-right-leave-to {
+  opacity: 0;
+  transform: translate(50px, 0);
+}
+</style>
+```
+
+```html [layouts/default.vue]
+<script setup lang="ts">
+const route = useRoute()
+const id = computed(() => Number(route.params.id || 1))
+const prev = computed(() => '/' + (id.value - 1))
+const next = computed(() => '/' + (id.value + 1))
+</script>
+
+<template>
+  <div>
+    <slot />
+    <div v-if="$route.params.id">
+      <NuxtLink :to="prev">⬅️</NuxtLink> | 
+      <NuxtLink :to="next">➡️</NuxtLink>
+    </div>
+  </div>
+</template>
+```
+
+::
+
+The page now applies the `slide-left` transition when going to the next id and `slide-right` for the previous:
+
+<video controls class="rounded">
+  <source src="https://res.cloudinary.com/nuxt/video/upload/v1665069410/nuxt3/nuxt-dynamic-page-transitions.mp4" type="video/mp4">
+</video>
+
+## Transition with NuxtPage
+
+When `<NuxtPage />` is used in `app.vue`, transition-props can be passed directly as a component props to activate global transition.
+
+```vue [app.vue]
+<template>
+  <div>
+      <NuxtPage :transition="{
+        name: 'bounce',
+        mode: 'out-in'
+      }" />
+    </NuxtLayout>
+  </div>
+</template>
+```
+
+::alert{type="warning"}
+Remember, this page transition cannot be overridden with `definePageMeta` on individual pages.
+::