export declare const MIN_PASSWORD_LENGTH = 16;
export declare const MIN_CHARACTER_CLASSES = 3;
export declare const MAX_CONSECUTIVE_REPEATED = 3;
export declare const MIN_SEQUENTIAL_LENGTH = 4;
/**
 * Reason categories for password validation failures.
 */
export type PasswordValidationFailure = 'missing' | 'too_short' | 'insufficient_classes' | 'repeated_characters' | 'sequential_pattern';
/**
 * Thrown when a password does not satisfy the strength policy applied to
 * private storage and export/import operations.
 */
export declare class PasswordValidationError extends Error {
    readonly reason: PasswordValidationFailure;
    constructor(message: string, reason: PasswordValidationFailure);
}
/**
 * Shared password strength policy for private storage and export/import operations.
 * Throws {@link PasswordValidationError} on the first violated rule.
 */
export declare const validatePassword: (password: string) => void;
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