/**
 * Z.AI credential resolution (DESIGN.md §6, P0-02 — Fixup A — B4, B7).
 *
 * Single source of truth for the Z.AI API key. The primary
 * `Z_AI_API_KEY` is accepted alongside the characterized `ZAI_API_KEY`
 * alias; `Z_AI_API_KEY` takes precedence when both are set. Whitespace-
 * only values are treated as absent, matching the descriptor's
 * `isConfigured` contract.
 *
 * 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. This mirrors `lib/config.ts`
 * (`loadConfig`/`getApiKey`) so every Z.AI entry point agrees on the
 * missing-credential exit code.
 */
/** Credential environment names read by this module (#232 derivation pin). */
export declare const ENV_NAMES: readonly ["Z_AI_API_KEY", "ZAI_API_KEY"];
/**
 * Resolve the Z.AI API key without throwing. `Z_AI_API_KEY` takes
 * precedence over the `ZAI_API_KEY` alias. Returns `undefined` when no
 * non-blank value is present.
 */
export declare function resolveZaiApiKey(env: NodeJS.ProcessEnv): string | undefined;
/**
 * Resolve the Z.AI API key or throw {@link ConfigurationError} (exit 3)
 * when it is missing. Call this at every capability invocation gate.
 */
export declare function requireZaiApiKey(env: NodeJS.ProcessEnv): string;
/**
 * True when a non-blank Z.AI API key (primary or alias) is configured.
 * Metadata-only: performs no transport construction and reads no other
 * Provider's credentials.
 */
export declare function isZaiConfigured(env: NodeJS.ProcessEnv): boolean;
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