/**
 * Firecrawl credential resolution (DESIGN.md §6, firecrawl tech-plan §3).
 *
 * Single source of truth for the Firecrawl API key. Whitespace-only values
 * are treated as absent, matching the descriptor's `isConfigured` contract.
 *
 * Firecrawl keys are `fc-`-prefixed and sent as `Authorization: Bearer fc-…`
 * on every request (transport arrives in FC-03). This module resolves the
 * raw env value only; it performs no transport and reads no other Provider's
 * credentials.
 *
 * 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 ["FIRECRAWL_API_KEY"];
/**
 * Resolve the Firecrawl API key without throwing. Returns `undefined`
 * when no non-blank value is present.
 */
export declare function resolveFirecrawlApiKey(env: NodeJS.ProcessEnv): string | undefined;
/**
 * Resolve the Firecrawl API key or throw {@link ConfigurationError}
 * (exit 3) when it is missing. Call this at every capability
 * invocation gate.
 */
export declare function requireFirecrawlApiKey(env: NodeJS.ProcessEnv): string;
/**
 * True when a non-blank Firecrawl API key is configured. Metadata-only:
 * performs no transport construction and reads no other Provider's
 * credentials.
 */
export declare function isFirecrawlConfigured(env: NodeJS.ProcessEnv): boolean;
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