pinafore/routes/_utils/testStorage.js

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// LocalStorage and IDB may be disabled in private mode, when "blocking cookies" in Safari,
// or other cases
import { thunk } from './thunk'
const testKey = '__test__'
export const testHasLocalStorageOnce = () => {
try {
localStorage.setItem(testKey, testKey)
if (!localStorage.length || localStorage.getItem(testKey) !== testKey) {
return false
}
localStorage.removeItem(testKey)
} catch (e) {
return false
}
return true
}
export const testHasLocalStorage = thunk(testHasLocalStorageOnce)
export const testHasIndexedDB = thunk(async () => {
if (typeof indexedDB === 'undefined') {
return false
}
try {
let idbFailed = await new Promise(resolve => {
let db = indexedDB.open(testKey)
db.onerror = () => resolve(true)
db.onsuccess = () => {
indexedDB.deleteDatabase(testKey)
resolve(false)
}
})
if (idbFailed) {
return false
}
} catch (e) {
return false
}
return true
})