/**
 * @name signer/signer-resolver
 * @description Resolves the appropriate signer implementation based on SAP MCP configuration mode.
 *
 * @flow
 *   1. `resolveSigner` reads the config mode and determines the signer mode via `getSignerModeFromConfig`.
 *   2. For `local-keypair` mode, creates a local keypair signer from `walletPath`.
 *   3. For `external` mode, creates an external signer from `externalSignerUrl`.
 *   4. For `none` mode (readonly), returns a result with no signer.
 *   5. For `delegated` mode, throws — delegated signers are session-bound and resolved at runtime.
 *
 * @module signer/signer-resolver
 */
import type { SapMcpConfig } from '../../core/src/types.js';
import type { SignerResult } from './signer-types.js';
/**
 * @name resolveSigner
 * @description Resolves and creates a signer instance based on the SAP MCP configuration.
 *
 * @param config — SAP MCP configuration with mode, wallet path, and external signer URL.
 * @returns A `SignerResult` containing the signer, mode, and optional public key.
 * @throws `SignerError` if required config is missing for the resolved mode, or if the mode is `delegated`.
 *
 * @usedBy `create-server.ts:createSapMcpServer`.
 */
export declare function resolveSigner(config: SapMcpConfig): Promise<SignerResult>;
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