Function dropInstance

src/drivers/indexeddb.js:950–1100

(options, callback)

}

function dropInstance(options, callback) {
    callback = getCallback.apply(this, arguments);

    var currentConfig = this.config();
    options = (typeof options !== 'function' && options) || {};
    if (!options.name) {
        options.name = options.name || currentConfig.name;
        options.storeName = options.storeName || currentConfig.storeName;
    }

    var self = this;
    var promise;
    if (!options.name) {
        promise = Promise.reject('Invalid arguments');
    } else {
        const isCurrentDb =
            options.name === currentConfig.name && self._dbInfo.db;

        const dbPromise = isCurrentDb
            ? Promise.resolve(self._dbInfo.db)
            : _getOriginalConnection(options).then(db => {
                  const dbContext = dbContexts[options.name];
                  const forages = dbContext.forages;
                  dbContext.db = db;
                  for (var i = 0; i < forages.length; i++) {
                      forages[i]._dbInfo.db = db;
                  }
                  return db;
              });

        if (!options.storeName) {
            promise = dbPromise.then(db => {
                _deferReadiness(options);

                const dbContext = dbContexts[options.name];
                const forages = dbContext.forages;

                db.close();
                for (var i = 0; i < forages.length; i++) {
                    const forage = forages[i];
                    forage._dbInfo.db = null;
                }

                const dropDBPromise = new Promise((resolve, reject) => {
                    var req = idb.deleteDatabase(options.name);

                    req.onerror = () => {
                        const db = req.result;
                        if (db) {
                            db.close();
                        }
                        reject(req.error);
                    };

                    req.onblocked = () => {
                        // Closing all open connections in onversionchange handler should prevent this situation, but if
                        // we do get here, it just means the request remains pending - eventually it will succeed or error
                        console.warn(