/**
 * Where .faf data came from: the file readFaf read it from (its real path) and
 * the text it read. writeFaf checks a write of that data against it — when the
 * file changed on disk after the read, the write is refused instead of being
 * made over the newer edit. Kept apart from interop/faf.ts so the pure parts
 * of detection (updateExistingFaf) can carry it without importing a module
 * that runs git.
 */
/** The file a data object was read from, and the text read. */
export interface FafSource {
    real: string;
    text: string;
}
/** The source recorded for `data`, if any. */
export declare function fafSourceOf(data: unknown): FafSource | undefined;
/** Record that `data` holds what `source.text` (read from `source.real`) says. */
export declare function setFafSource(data: object, source: FafSource): void;
/** Let `to` — data made from `from` (a copy with empty slots filled, say) —
 *  carry the file `from` was read from. Returns `to`. */
export declare function carryFafSource<T extends object>(from: unknown, to: T): T;
/** Mark `data` as a fill of the file it was read from — what `faf auto`
 *  (updateExistingFaf) makes: detected values in the file's empty slots.
 *  writeFaf leaves a node with an anchor that an alias reads as written in
 *  such data, since filling it would change every alias. Returns `data`. */
export declare function markAsFill<T extends object>(data: T): T;
/** True when `data` was marked with {@link markAsFill}. */
export declare function isFill(data: unknown): boolean;