/**
 * A message, an error, or something which can generate one of those.
 */
export type MessageOrError = string | Error | (() => (string | Error));
/**
 * Helper for guards which expect text or an error, or
 * can generate one when needed.
 */
export declare const errorFromMessageOrError: (messageOrError: MessageOrError, defaultConstructor?: (new (message: string) => Error)) => Error;
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