/**
 * Parser implementations convert stdout and stderr from the underlying child
 * process to a more useable format. This can be a no-op passthrough if no
 * parsing is necessary.
 */
export interface Parser<T> {
    /**
     * Invoked once per task.
     *
     * @param stdout the concatenated stream from `stdin`, stripped of the `PASS`
     * or `FAIL` tokens from `BatchProcessOptions`.
     *
     * @param stderr if defined, includes all text emitted to stderr.
     *
     * @param passed `true` iff the `PASS` pattern was found in stdout.
     *
     * @throws an error if the Parser implementation wants to reject the task. It
     * is valid to raise Errors if stderr is undefined.
     *
     * @see BatchProcessOptions
     */
    (stdout: string, stderr: string | undefined, passed: boolean): T | Promise<T>;
}
export declare const SimpleParser: Parser<string>;