<pre class="shiki github-dark shaku"><code>window.myLocalStorage = { getItem(key) { const stringifiedItem = window.localStorage.getItem(key) if (stringifiedItem === null) return null const item = JSON.parse(stringifiedItem) if (item.expiredAt === null || item.expiredAt &gt; Date.now()) return item.value window.localStorage.removeItem(key) return null }, setItem(key, value, maxAge) { const obj = { value, expiredAt: maxAge === undefined ? null : Date.now() + maxAge } window.localStorage.setItem(key, JSON.stringify(obj)) }, removeItem(key) { window.localStorage.removeItem(key) }, clear() { window.localStorage.clear() }}</code></pre>

Simple and correct

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localStorage is a simple and handy client-side storage, but you should avoid using it because it is synchronous. Also Safari's ITP actually deletes cl…