/**
 * Input validators used by the UI to surface preview feedback before
 * the user hits the server. The Entropy Softworks application servers
 * enforce these same rules authoritatively (see `entropy-auth`'s
 * `password::policy` / `Validation`); these implementations are kept
 * deliberately strict to avoid false positives on the client.
 *
 * Email: a permissive `local@host.tld` shape — anything stricter risks
 * rejecting valid addresses, and the server validates anyway.
 *
 * Password: matches the default `entropy-auth` policy (≥8 chars, mixed
 * case, digit, symbol). Apps that opt their server into a different
 * policy can ignore the `valid` result and let the server be the source
 * of truth.
 *
 * Username: 3–30 chars, ASCII alnum + underscore.
 */
export interface PasswordValidation {
    valid: boolean;
    errors: string[];
}
export interface UsernameValidation {
    valid: boolean;
    error?: string;
}
export declare function validateEmail(email: string): boolean;
export declare function validatePassword(password: string): PasswordValidation;
export declare function validateUsername(username: string): UsernameValidation;
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