/**
 * PII Allowlist Configuration
 *
 * Defines trusted phone numbers that should NOT be redacted from web content.
 * Primarily for verified health authority and government emergency numbers.
 *
 * CRITICAL: Only add numbers that are:
 * 1. Publicly published institutional/government numbers
 * 2. Verified health/safety authorities
 * 3. Not personal contact information
 */
export interface TrustedPhoneNumber {
    /** Display name for logging */
    name: string;
    /** Normalized phone number variants (all formats this number might appear in) */
    numbers: string[];
    /** Optional: domains where this number is trusted (empty = trusted everywhere) */
    trustedDomains?: string[];
    /** Category for audit logging */
    category: 'emergency' | 'health_authority' | 'government' | 'helpline';
}
export interface PIIAllowlistConfig {
    /** When true, trusted numbers only preserved if source domain matches trustedDomains */
    strictDomainMode: boolean;
    /** List of verified trusted phone numbers */
    trustedPhoneNumbers: TrustedPhoneNumber[];
}
/**
 * Normalize a phone number to digits-only format for comparison
 */
export declare function normalizePhoneNumber(phone: string): string;
/**
 * Extract domain from URL (returns hostname without www.)
 */
export declare function extractDomain(url: string): string;
/**
 * Built-in allowlist of verified health authority and emergency numbers
 */
export declare const DEFAULT_ALLOWLIST: PIIAllowlistConfig;
/**
 * Check if a phone number should be allowlisted (not redacted)
 *
 * @param phoneNumber The phone number to check (in any format)
 * @param sourceUrl Optional source URL for domain-scoped allowlisting
 * @param config Optional custom config (defaults to DEFAULT_ALLOWLIST)
 * @returns The trusted number entry if allowlisted, null otherwise
 */
export declare function isAllowlistedPhoneNumber(phoneNumber: string, sourceUrl?: string, config?: PIIAllowlistConfig): TrustedPhoneNumber | null;
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