code: function() {
          const prefix = E2E_PREFIX + 'inboundgroupsessions/';
          const result = [];
          for (let i = 0; i < this.store.length; i++) {
              const key = this.store.key(i);
              if (!key.startsWith(prefix)) {
                  continue;
              }
              // we can't use split, as the components we are trying to split out
              // might themselves contain '/' characters. We rely on the
              // senderKey being a (32-byte) curve25519 key, base64-encoded
              // (hence 43 characters long).
  
              result.push({
                  senderKey: key.substr(prefix.length, 43),
                  sessionId: key.substr(prefix.length + 44),
              });
          }
          return result;
      }
docs: Retrieve a list of all known inbound group sessions
  
  @return {{senderKey: string, sessionId: string}}