/** Fields needed to build a human-correlatable diff filename. */
export interface DiffArtifactNameParts {
    evalName: string;
    stimulus: string;
    model?: string;
    trialIndex?: number;
    turn?: number;
}
export declare function diffArtifactFilename(parts: DiffArtifactNameParts, seq: number): string;
/**
 * Write `content` to `filePath` via a temp-file-then-rename, creating parent
 * directories on demand, so a process crash mid-write cannot leave a
 * truncated file behind. Shared by every sidecar artifact writer.
 */
export declare function writeFileAtomic(filePath: string, content: string): Promise<void>;
/**
 * Write {@link diff} into {@link diffsDir} as {@link filename}, creating the
 * directory on demand. Returns the path to store on the trajectory — relative
 * to the directory that contains `results.jsonl` (the parent of `diffsDir`),
 * using forward slashes so it is portable across platforms.
 */
export declare function writeDiffArtifact(diffsDir: string, filename: string, diff: string): Promise<string>;
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