export interface StaleBuildOptions {
    entryFile?: string | null;
    startedAt?: number;
}
/**
 * Returns a one-line warning the first time a build newer than this process is seen (and again
 * only if an even newer build lands), otherwise null. Never throws: a diagnostic must not be
 * able to break a tool call.
 */
export declare function staleBuildNote(options?: StaleBuildOptions): string | null;
/** Test hook: forget what was already warned about. */
export declare function resetStaleBuildWarning(): void;
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