/**
 * Extracts a human-readable error message from an unknown error value.
 * Handles Error instances, string errors, and other types safely.
 */
export declare function getErrorMessage(error: unknown): string;
/**
 * Extracts an error message from an unknown error value, with a fallback
 * for when no message can be extracted.
 */
export declare function getErrorMessageOr(error: unknown, fallback: string): string;
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