/**
 * Sparse Fieldsets — filter output fields based on a dot-separated pattern list.
 *
 * Patterns use dot-separated paths with a `*` wildcard that matches
 * any single segment at the end.  Examples:
 *
 *   `["id", "price", "legs.*"]`
 *
 * `"id"` matches the top-level `id` field.
 * `"legs.*"` matches any immediate child of `legs` (e.g. `legs.duration`).
 *
 * If `requestedFields` is `undefined` or empty, all fields are included.
 */
/**
 * Returns `true` when the given output field path is matched by at least
 * one pattern in `requestedFields`.
 *
 * A field is included when:
 *   - `requestedFields` is undefined/empty (no filter — include everything)
 *   - An exact pattern matches the field name (e.g. `"id"` matches `"id"`)
 *   - A parent pattern matches (e.g. `"legs"` matches `"legs"` and `"legs.duration"`)
 *   - A wildcard pattern matches (e.g. `"legs.*"` matches `"legs.duration"`)
 *   - The field is an ancestor of a requested deeper path
 *     (e.g. `"legs.duration"` means `"legs"` must be included)
 */
export declare function matchesRequestedFields(fieldPath: string, requestedFields: string[] | undefined): boolean;
/**
 * Filter a set of top-level output field names against `requestedFields`.
 * Returns the filtered set.  If `requestedFields` is undefined/empty,
 * returns the original set unchanged.
 */
export declare function filterOutputFields(outputFields: Set<string>, requestedFields: string[] | undefined): Set<string>;
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