/** @internal Test-only stack frame sanitization seam. */
export declare function sanitizeUserFacingStackFrameForTesting(line: string): string;
/**
 * Format error as a polished box with solution
 */
export declare function formatErrorBox(error: Error): string;
/**
 * Format error with plain text (existing behavior)
 */
export declare function formatUserError(error: Error): string;
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