catstodon/app/javascript/mastodon/storage/db.js

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export default () => new Promise((resolve, reject) => {
// ServiceWorker is required to synchronize the login state.
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// Microsoft Edge 17 does not support getAll according to:
// Catalog of standard and vendor APIs across browsers - Microsoft Edge Development
// https://developer.microsoft.com/en-us/microsoft-edge/platform/catalog/?q=specName%3Aindexeddb
if (!('caches' in self && 'getAll' in IDBObjectStore.prototype)) {
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reject();
return;
}
const request = indexedDB.open('mastodon');
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request.onerror = reject;
request.onsuccess = ({ target }) => resolve(target.result);
request.onupgradeneeded = ({ target }) => {
const accounts = target.result.createObjectStore('accounts', { autoIncrement: true });
const statuses = target.result.createObjectStore('statuses', { autoIncrement: true });
accounts.createIndex('id', 'id', { unique: true });
accounts.createIndex('moved', 'moved');
statuses.createIndex('id', 'id', { unique: true });
statuses.createIndex('account', 'account');
statuses.createIndex('reblog', 'reblog');
};
});