import type { SessionRef } from "./discovery.js";
import type { LiveSessionBranch, MemoryBranches } from "./lineage.js";
import type { MemoryIndexOptions } from "./index.js";
interface SourceIdentity {
    device: bigint;
    inode: bigint;
    size: bigint;
    modifiedAt: bigint;
    changedAt: bigint;
}
export interface SourceObservation {
    file: string;
    identity: SourceIdentity;
    liveBranchSignature: string | null;
}
type LiveBranchResolver = MemoryIndexOptions["liveBranchForFile"];
export declare const observeSource: (file: string, branches: MemoryBranches, liveBranch: LiveSessionBranch | undefined) => SourceObservation | null;
/**
 * Observation identity for a portable host source snapshot: derived from the
 * adapter revision plus the engine's source hash, so a changed or reloaded
 * snapshot invalidates request caches without any filesystem access.
 */
export declare const observeHostSource: (displayKey: string, revision: string, sourceHash: string) => SourceObservation;
export declare const observeSources: (refs: readonly SessionRef[], branches: MemoryBranches, liveResolver: LiveBranchResolver) => SourceObservation[] | null;
export declare const sameSourceObservation: (left: SourceObservation, right: SourceObservation) => boolean;
export declare const sameSourceObservations: (left: readonly SourceObservation[], right: readonly SourceObservation[]) => boolean;
export {};
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