/**
 * A request the page sent on speculation: `Sec-Purpose` is the standard's name,
 * sent by `<link rel="prefetch">` and speculation rules; `Purpose` is the name
 * before it; `Next-Router-Prefetch` is the Next.js App Router's, which a router
 * reproducing it sends for every link it can see.
 */
export declare function isSpeculative(headers: Readonly<Record<string, string>>): boolean;
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