export type Say = (line: string) => void;
export declare const stderrSay: Say;
export declare const outcomeOfStep: (step: {
    ok: boolean;
    ran: boolean;
}) => 'failed' | 'ok' | 'skipped';
export declare const timed: <T>({ everyMs, name, outcomeOf, say }: {
    everyMs?: number;
    name: string;
    outcomeOf?: (result: T) => 'failed' | 'ok' | 'skipped';
    say: Say;
}, run: () => Promise<T>) => Promise<T>;