/**
 * Formats an error for logging by extracting the message if available, falling back to string conversion for non-Error objects. Trailing punctuation is stripped
 * to allow callers to add consistent punctuation in their log format strings.
 * @param error - The error to format.
 * @returns A string representation suitable for logging, without trailing punctuation.
 */
export declare function formatError(error: unknown): string;
/**
 * Checks whether an error indicates that the browser page or session has been closed or is otherwise unrecoverable. These errors should cause immediate abort of
 * any retry loops rather than continuing to retry an operation that will never succeed. Common unrecoverable errors include closed targets, closed sessions, and
 * detached frames (which occur when the page has been closed mid-operation).
 * @param error - The error to check.
 * @returns True if the error indicates a closed or unrecoverable state.
 */
export declare function isSessionClosedError(error: unknown): boolean;