57 lines
1.5 KiB
JavaScript
57 lines
1.5 KiB
JavaScript
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const handleThemeChange = (dark) => {
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const root = window.document.documentElement
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root.setAttribute('data-bs-theme', dark ? 'dark' : 'light')
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}
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const STORAGE_KEY = 'darkMode'
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const PREFER_DARK_QUERY = '(prefers-color-scheme: dark)'
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export const getTheme = () => {
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const mql = window.matchMedia(PREFER_DARK_QUERY)
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const supportsColorSchemeQuery = mql.media === PREFER_DARK_QUERY
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let localStorageTheme = null
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try {
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localStorageTheme = window.localStorage.getItem(STORAGE_KEY)
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} catch (err) {}
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const localStorageExists = localStorageTheme !== null
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if (localStorageExists) {
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localStorageTheme = JSON.parse(localStorageTheme)
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}
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if (localStorageExists) {
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return { user: true, dark: localStorageTheme }
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} else if (supportsColorSchemeQuery) {
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return { user: false, dark: mql.matches }
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}
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}
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export const setTheme = (dark) => {
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window.localStorage.setItem(STORAGE_KEY, JSON.stringify(dark))
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handleThemeChange(dark)
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}
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export const listenForThemeChange = (onChange) => {
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const mql = window.matchMedia(PREFER_DARK_QUERY)
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mql.onchange = mql => {
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const { user, dark } = getTheme()
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if (!user) {
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handleThemeChange(dark)
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onChange({ user, dark })
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}
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}
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window.onstorage = e => {
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if (e.key === STORAGE_KEY) {
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const dark = JSON.parse(e.newValue)
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setTheme(dark)
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onChange({ user: true, dark })
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}
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}
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}
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if (typeof window !== 'undefined') {
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(function () {
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const { dark } = getTheme()
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handleThemeChange(dark)
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})()
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}
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