/**
 * Authentication Configuration Constants
 * Issue #331: Shared constants for auth.ts and middleware.ts
 *
 * CONSTRAINT: This module must be Edge Runtime compatible.
 * No Node.js-specific imports (crypto, fs, etc.) are allowed.
 */
/** Cookie name for authentication token */
export declare const AUTH_COOKIE_NAME: "cm_auth_token";
/**
 * Validate that a CM_AUTH_TOKEN_HASH value is a well-formed SHA-256 hex string.
 * Used by both auth.ts and middleware.ts to ensure consistent auth-enabled detection.
 * Returns a type predicate so callers can narrow the type after checking.
 *
 * @param hash - The hash string to validate
 * @returns true if the hash is a valid 64-character hex string
 */
export declare function isValidTokenHash(hash: string | undefined): hash is string;
/**
 * Paths excluded from authentication check.
 * S002: Must use === for matching (no startsWith - bypass attack prevention)
 */
export declare const AUTH_EXCLUDED_PATHS: readonly ["/login", "/api/auth/login", "/api/auth/logout", "/api/auth/status"];
/** Default token expiration duration (24 hours) */
export declare const DEFAULT_EXPIRE_DURATION_MS: number;
/**
 * Parse a duration string into milliseconds.
 * Supported formats: Nh (hours), Nd (days), Nm (minutes)
 * Minimum: 1h, Maximum: 30d
 *
 * @param s - Duration string (e.g., "24h", "7d", "90m")
 * @returns Duration in milliseconds
 * @throws Error if format is invalid or out of range
 */
export declare function parseDuration(s: string): number;
/**
 * Compute token expiration timestamp from environment variables.
 * Used by both auth.ts (Node.js) and middleware.ts (Edge Runtime).
 *
 * @returns Expiration timestamp (ms since epoch), or null if auth is not enabled
 */
export declare function computeExpireAt(): number | null;
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