export type ProxyRequestInit = RequestInit & {
    duplex?: "half";
};
/**
 * Mark forwarded Web streams as half duplex for Node's fetch implementation.
 *
 * Deno and Bun accept the standard fetch extension, while Node requires it
 * whenever a ReadableStream is used as a request body. The body and every
 * other init value retain their existing identity and ownership.
 */
export declare function withProxyStreamingBodyDuplex(init: RequestInit): ProxyRequestInit;
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