addon/utils/storage-available.js
// Feature detection from MDN
// https://developer.mozilla.org/en-US/docs/Web/API/Web_Storage_API/Using_the_Web_Storage_API#Feature-detecting_localStorage
export default function storageAvailable(type) {
var storage;
try {
storage = window[type];
var x = '__storage_test__';
storage.setItem(x, x);
storage.removeItem(x);
return true;
} catch (e) {
return (
e instanceof DOMException &&
// everything except Firefox
(e.code === 22 ||
// Firefox
e.code === 1014 ||
// test name field too, because code might not be present
// everything except Firefox
e.name === 'QuotaExceededError' ||
// Firefox
e.name === 'NS_ERROR_DOM_QUOTA_REACHED') &&
// acknowledge QuotaExceededError only if there's something already stored
storage &&
storage.length !== 0
);
}
}