Removed in wpapi 2.0.0. The library now uses the native fetch API in all environments, so the default export no longer needs a separate transport:

import WPAPI from 'wpapi';

// Configure and use WPAPI as normal
const site = new WPAPI( { /* ... */ } );

Requiring wpapi/superagent throws an error pointing to this migration path. If you relied on superagent-specific behavior (retries, proxies, instrumentation), pass a custom HTTP transport instead.