/**
 * postgres-mcp — Auth Helpers
 *
 * Shared authentication utilities used by both middleware.ts
 * (Express-style) and transport-agnostic.ts.
 */
/**
 * Extract a Bearer token from an Authorization header.
 *
 * - Returns `null` for missing, malformed, or non-Bearer headers
 * - Trims the token and rejects empty tokens
 * - Case-insensitive scheme matching (`Bearer`, `bearer`, etc.)
 */
export declare function extractBearerToken(authHeader: string | undefined): string | null;
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