export declare function normalizeEmail(value: string): string;
export declare function isValidEmail(value: string): boolean;
export declare function parseEmail(value: unknown): string | null;
/**
 * Masks email local-part while preserving enough context for support/debug.
 * Example: `username@example.com` -> `us****me@example.com`.
 */
export declare function maskEmail(email: string): string;
/**
 * Splits a full name into first/last parts.
 */
export declare function splitName(name?: string): {
    firstName: string;
    lastName: string;
    fullName: string;
};
/**
 * Resolves display name: use explicit name if provided, otherwise generate from email.
 * Returns null when neither value can produce a valid name.
 */
export declare function resolveNameWithFallback(rawName: unknown, rawEmail: unknown): string | null;
/**
 * Generates a human-readable name from the local-part of email.
 * - strips plus-addressing suffix (`+tag`)
 * - treats `.`, `_`, `-` as word separators
 * - collapses spaces and applies Title Case
 * Falls back to the original email string when local-part is empty/invalid.
 */
export declare function generateNameFromEmail(email: string): string;
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