/** Inject OpenRouter's `provider` routing block into a JSON request body.
 *  OpenRouter routes to ANY provider unless the body carries this block. Returns
 *  the body unchanged if it is not JSON. */
export declare function injectOpenRouterProvider(bodyStr: string, region: string, allowFallbacks: boolean): string;
/** A `fetch` middleware that pins OpenRouter routing, ESCALATING fallbacks across
 *  retries: the FIRST request honours `firstAttemptAllowFallbacks` (the configured
 *  pin — false hard-pins the required provider), every RETRY allows fallbacks so a
 *  transient provider error (429/502) can reroute at OpenRouter's discretion.
 *  `order:[region]` is always kept, so the required provider stays the preference. */
export declare function openRouterEscalatingFetch(region: string, firstAttemptAllowFallbacks: boolean): typeof fetch;
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