/**
 * SMI-914: User Data Anonymization
 * SMI-917: Per-installation salt for improved anonymization security
 *
 * Provides one-way hashing functions to anonymize user identifiers
 * and project context without storing any PII.
 */
/**
 * Get the path to the installation-specific salt file
 *
 * @returns Path to ~/.skillsmith/anonymizer-salt
 */
export declare function getSaltPath(): string;
/**
 * Load existing salt or create a new one for this installation
 *
 * The salt is:
 * - Generated once per installation (32 random bytes)
 * - Stored at ~/.skillsmith/anonymizer-salt
 * - Cached in memory after first load
 * - Falls back to static salt if file operations fail
 *
 * @returns Buffer containing the salt
 */
export declare function loadOrCreateSalt(): Buffer;
/**
 * Clear the cached salt (primarily for testing)
 */
export declare function clearSaltCache(): void;
/**
 * Anonymize a user identifier using SHA-256 hash
 *
 * The hash is:
 * - One-way: Cannot recover the original identifier
 * - Consistent: Same input always produces same output
 * - Truncated: 16 characters for storage efficiency
 *
 * @param identifier - The user identifier to anonymize (e.g., machine ID, username)
 * @returns Anonymized 16-character hex string
 */
export declare function anonymizeUserId(identifier: string): string;
/**
 * Hash project context to avoid storing PII
 *
 * Creates a deterministic hash of the project context object,
 * allowing grouping of usage events by project type without
 * storing actual project paths or names.
 *
 * @param context - Object containing project context (framework, language, etc.)
 * @returns 8-character hex hash of the context
 */
export declare function hashProjectContext(context: Record<string, unknown>): string;
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