import type { SessionEntry } from "./session-entries.js";
export interface RuntimeIdentity {
    /** omp package version. */
    version: string;
    /** Source checkout commit; absent for installed builds. */
    commit?: string;
    /** Source checkout branch; absent on a detached HEAD. */
    branch?: string;
    /** Historical uncommitted-diff hash from older session entries; new entries omit it. */
    diff?: string;
    /** Free-form name from `OMP_BUILD_LABEL`. */
    label?: string;
}
/** Adopt the main thread's build stamp for subagent workers. */
export declare function adoptRuntimeIdentity(identity: RuntimeIdentity): void;
/** Build identity of this process, resolved when first needed. */
export declare function currentRuntimeIdentity(): RuntimeIdentity;
/**
 * Whether two stamps can name the same build. An `unknown` diff matches any diff of the same commit:
 * entries written before the diff was read carry it, and it carries no information to tell builds apart.
 */
export declare function sameRuntimeIdentity(a: RuntimeIdentity | null | undefined, b: RuntimeIdentity | null | undefined): boolean;
/**
 * Builds that wrote the entries, in file order, collapsing consecutive repeats. `null` stands
 * for entries without a stamp (written before builds were recorded, or replicated without one).
 */
export declare function runtimeIdentityHistory(entries: readonly SessionEntry[]): Array<RuntimeIdentity | null>;
/** One-line label, e.g. `18.10.4`, `18.10.4 will/topic@a1b2c3d4e5 +diff 3f2a9c01 "variant-a"`. */
export declare function formatRuntimeIdentity(identity: RuntimeIdentity | null | undefined): string;