/**
 * Exits with an error when the given argument version is published, because a
 * published version is read-only.
 */
export declare function assertNotPublished(argumentId: string, version: number): Promise<void>;
/**
 * Exits with an error when the premise has no directory on disk. Callers pass
 * their own message where the wording differs from the usual one.
 */
export declare function assertPremiseExists(argumentId: string, version: number, premiseId: string, notFoundMessage?: string): Promise<void>;
/**
 * The text to show for a caught value: the message of an `Error`, or the
 * value converted to a string for anything else that was thrown.
 */
export declare function errorMessage(err: unknown): string;
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