/**
 * Shared Authentication Utilities
 *
 * Common functions for OAuth token handling across quota fetchers.
 */
/**
 * Sanitize email to match CLIProxyAPI auth file naming convention.
 * Replaces @ and . with underscores for filesystem compatibility.
 */
export declare function sanitizeEmail(email: string): string;
/**
 * Check if token is expired based on the expired timestamp.
 * Returns false if timestamp is missing or invalid (fail-open for quota display).
 */
export declare function getTokenExpiryTimestamp(expiredValue?: string | number | null): number | null;
export declare function isTokenExpired(expiredValue?: string | number | null): boolean;
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