/**
 * Spider.cloud credential resolution.
 *
 * Single source of truth for the Spider.cloud API key
 * (`SPIDER_API_KEY`, Bearer-authenticated against
 * `https://api.spider.cloud`). Whitespace-only values are treated as
 * absent, matching the descriptor's `isConfigured` contract. Unlike the
 * Firecrawl variant, this resolver returns the *trimmed* value so the
 * Bearer header never carries surrounding whitespace.
 *
 * Boundary rules (ARCHITECTURE.md §2):
 *   - May import the normalized-error contract only.
 *   - Must NOT import transport, command presentation, or another
 *     Provider's Adapter.
 *
 * Missing credentials are surfaced as {@link ConfigurationError}
 * (exit 3), distinct from {@link AuthError} (exit 1) which means the
 * Provider REJECTED a presented credential.
 */
/** Credential environment names read by this module (#232 derivation pin). */
export declare const ENV_NAMES: readonly ["SPIDER_API_KEY"];
/**
 * Resolve the Spider.cloud API key without throwing. Returns the
 * trimmed key, or `undefined` when no non-blank value is present.
 */
export declare function getSpiderApiKey(env: NodeJS.ProcessEnv): string | undefined;
/**
 * Resolve the Spider.cloud API key or throw {@link ConfigurationError}
 * (exit 3) when it is missing. Call this at every capability
 * invocation gate.
 */
export declare function requireSpiderApiKey(env: NodeJS.ProcessEnv): string;
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