/** Minimal structural fetch shape. */
type FetchLike = (input: any, init?: any) => Promise<{
    status: number;
}>;
/** Holder of a `fetch` property — globalThis by default, or a scoped object. */
interface FetchTarget {
    fetch: FetchLike;
}
export interface InstrumentFetchOptions {
    /** Object whose `fetch` is wrapped. Defaults to globalThis. */
    target?: FetchTarget | null;
    /** Home API base URL for request-key origin resolution. */
    baseURL?: string;
}
/**
 * Wrap a target's fetch so requests inside a journeyStep are attributed and timed.
 * Call once per target (idempotent — second call is a no-op). Returns a restore
 * function that puts the original fetch back. Observation-only.
 * Soft-skips when the resolved target is missing or has no callable `fetch`.
 */
export declare function instrumentFetch(options?: InstrumentFetchOptions | null): () => void;
export {};
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