/**
 * @name signer/load-keypair
 * @description Loads Solana keypairs from filesystem or environment variables.
 *
 * WARNING: Only use in `local-dev-keypair` mode. NEVER in production.
 *
 * @flow
 *   1. `loadKeypairFromFile` reads a JSON keypair array from disk and constructs a `Keypair`.
 *   2. `loadKeypairFromEnv` reads a base58-encoded secret key from an environment variable.
 *
 * @module signer/load-keypair
 */
import { Keypair } from '@solana/web3.js';
/**
 * @name loadKeypairFromFile
 * @description Loads a Solana keypair from a JSON file on disk.
 *
 * @param walletPath — Filesystem path to the keypair JSON file (array of 64 bytes).
 * @returns A Solana `Keypair` constructed from the secret key.
 * @throws `SignerError` if the file cannot be read or parsed.
 *
 * @usedBy `local-keypair-signer.ts:createLocalKeypairSigner`, `sap-client-manager.ts:SapClientManager.initialize`
 */
export declare function loadKeypairFromFile(walletPath: string): Keypair;
/**
 * @name loadKeypairFromEnv
 * @description Loads a Solana keypair from a base58-encoded environment variable.
 *
 * @param envVar — Name of the environment variable containing the base58-encoded secret key.
 * @returns A Solana `Keypair` constructed from the decoded secret key.
 * @throws `SignerError` if the environment variable is not set.
 *
 * @usedBy Signer initialization in environments where file-based keypairs are not available.
 */
export declare function loadKeypairFromEnv(envVar: string): Promise<Keypair>;
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