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feat: Adds SSR support
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Diff for: ‎docs/.vuepress/config.js

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@@ -53,6 +53,7 @@ module.exports = {
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collapsable: false,
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children: [
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'/howto/',
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'/howto/ssr.md',
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'/howto/nuxt.md',
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'/howto/vuepress.md',
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'/howto/tailwind.md'

Diff for: ‎docs/guide/storage.md

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By default the `@vue-a11y/dark-mode` component use **localStorage** to store the user's choice of color mode.
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| Prop | Type | Default | Options
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| ------------ | --------- | ------------- | -------------------
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| `storage` | String | `localStorage` | `localStorage` or `sessionStorage`
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| Prop | Type | Default
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| ------------ | ------------------- | ----------------
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| `storage` | String \| Object | `localStorage`
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```vue
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<DarkMode storage="sessionStorage">
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```
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::: tip
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Currently, the component does not support the use of cookies (essential for use with SSR).
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See more about using `cookies` on storage to [support SSR](/howto/ssr.html)
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:::

Diff for: ‎docs/howto/ssr.md

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# SSR
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`@vue-a11y/dark-mode` supports SSR applications.
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::: tip
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If you are using `vue-cli` to build your project, we recommend using [@akryum/vue-cli-plugin-ssr](https://github.com/Akryum/vue-cli-plugin-ssr).
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****
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:::
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## Usage
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`@vue-a11y/dark-mode` adds a variable called `colorModeClass` to the SSR context for you to add to your server side template.
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We will use the **@akryum/vue-cli-plugin-ssr** as example.
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In your `public/index.ssr.html`
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```html{2}
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<!DOCTYPE html>
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<html lang="en" class="{{{ colorModeClass }}}">
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width,initial-scale=1.0">
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<link rel="icon" href="<%= BASE_URL %>favicon.ico">
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<title>{{ title }}</title>
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{{{ renderResourceHints() }}}
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{{{ renderStyles() }}}
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</head>
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<body>
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<!--vue-ssr-outlet-->
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{{{ renderState() }}}
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{{{ renderState({ contextKey: 'apolloState', windowKey: '__APOLLO_STATE__' }) }}}
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{{{ renderScripts() }}}
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</body>
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</html>
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```
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Setup the plugin in `src/main.js`
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```js
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import Vue from 'vue'
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import VueDarkMode from '@vue-a11y/dark-mode'
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Vue.use(VueDarkMode)
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// ...
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```
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## Storage
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For it to work on the server you need to use cookies as storage, just customize the `@vue-a11y/dark-mode` storage api.
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In this example, we use the `universal-cookie` to work in both environments.
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```vue{2,10,14,18,19,20,21,22}
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<template>
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<DarkMode :storage="storage">
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<template v-slot="{ mode }">
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Color mode: {{ mode }}
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</template>
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</DarkMode>
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</template>
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<script>
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import Cookies from 'universal-cookie'
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export default {
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data: () => ({
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storage: null
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}),
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created () {
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const cookies = new Cookies(this.$isServer ? this.$ssrContext.req.headers.cookie : null)
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this.storage = {
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getItem: key => cookies.get(key),
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setItem: (key, value) => cookies.set(key, value, { path: '/' })
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}
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}
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}
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</script>
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```

Diff for: ‎package.json

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"name": "@vue-a11y/dark-mode",
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"version": "0.2.0",
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"description": "A component that helps you implement \"dark-mode\" in your Vue app",
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"main": "dist/vue-dark-mode.umd.js",
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"main": "dist/vue-dark-mode.ssr.js",
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"browser": "dist/vue-dark-mode.esm.js",
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"module": "dist/vue-dark-mode.esm.js",
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"unpkg": "dist/vue-dark-mode.min.js",
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"browser": {
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"./sfc": "src/DarkMode.vue"
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},
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"scripts": {
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"dev": "rollup --config rollup.config.dev.js --watch",
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"build": "npm run build:umd & npm run build:es & npm run build:unpkg",
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"build:umd": "rollup --config rollup.config.prod.js --format umd --file dist/vue-dark-mode.umd.js",
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"build": "npm run build:ssr & npm run build:es & npm run build:unpkg",
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"build:ssr": "rollup --config rollup.config.prod.js --format cjs --file dist/vue-dark-mode.ssr.js",
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"build:es": "rollup --config rollup.config.prod.js --format es --file dist/vue-dark-mode.esm.js",
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"build:unpkg": "rollup --config rollup.config.prod.js --format iife --file dist/vue-dark-mode.min.js",
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"docs": "vuepress dev docs --no-cache",
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"docs:dev": "vuepress dev docs --no-cache",
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"docs:build": "vuepress build docs --no-cache && echo darkmode.vue-a11y.com >> docs/.vuepress/dist/CNAME",
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"docs:publish": "gh-pages -d docs/.vuepress/dist",
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"demo:dev": "cd demo && npm run serve",

Diff for: ‎rollup.config.prod.js

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import { terser } from 'rollup-plugin-terser'
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import vue from 'rollup-plugin-vue'
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export default {
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input: 'src/index.js',
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plugins: [
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commonjs(),
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replace({
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'process.env.NODE_ENV': JSON.stringify('production')
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}),
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vue({
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css: true,
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compileTemplate: true,
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template: {
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isProduction: true
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}
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}),
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buble(),
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terser()
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],
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output: {
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name: 'VueDarkMode',
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exports: 'named'
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export default commandLineArgs => {
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return {
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input: 'src/index.js',
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plugins: [
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commonjs(),
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replace({
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'process.env.NODE_ENV': JSON.stringify('production')
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}),
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vue({
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css: true,
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compileTemplate: true,
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template: {
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isProduction: true,
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optimizeSSR: commandLineArgs.format === 'cjs'
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}
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}),
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buble(),
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commandLineArgs.format === 'iife' && terser()
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],
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output: {
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name: 'VueDarkMode',
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exports: 'named'
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}
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}
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}

Diff for: ‎src/DarkMode.vue

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},
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storage: {
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type: [String, Object],
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validator: storage => {
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if (typeof storage === 'string') return ['localStorage', 'sessionStorage'].includes(storage)
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return Object.keys(storage).every(key => ['getItem', 'setItem'].includes(key))
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},
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default: 'localStorage'
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},
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metaThemeColor: {
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},
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getStorage () {
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if (typeof this.storage !== 'string') return this.storage
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if (this.$isServer) return false
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return storage(this.storage)
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},
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getStorageColorMode () {
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if (!this.getStorage) return this.defaultMode
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return this.getStorage.getItem('colorMode')
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},
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methods: {
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setMode (chosenMode) {
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this.chosenMode = chosenMode
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this.getStorage.setItem('colorMode', this.chosenMode)
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if (this.getStorage) this.getStorage.setItem('colorMode', this.chosenMode)
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this.handleColorModeClass('add')
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if (Object.keys(this.metaThemeColor).length) this.setMetaThemeColor(this.metaThemeColor[this.currentMode] || this.metaThemeColor[this.getPrefersColorScheme])
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this.$emit('change-mode', this.chosenMode)
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},
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handleColorModeClass (action) {
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if (this.$isServer) return
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return document.documentElement.classList[action](`${this.className.replace(/%cm/g, this.currentMode)}`)
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const className = `${this.className.replace(/%cm/g, this.currentMode)}`
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if (!this.$isServer) return document.documentElement.classList[action](className)
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this.$ssrContext.colorModeClass = this.currentMode === 'system' ? '' : className // Adds the className in the ssr context for the user to insert as they wish in the HTML tag
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},
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handlePreferColorScheme (e) {

Diff for: ‎src/utils.js

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export const storage = storage => {
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if (typeof storage !== 'string') return storage
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return {
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getItem: key => window[storage].getItem(key),
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setItem: (key, value) => window[storage].setItem(key, value)

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