import type { ResolvedConfigurationVariable } from "../../../../types/config.js";
/**
 * Returns the value of a configuration variable that holds a private key,
 * normalized like `getHexString` does.
 *
 * @throws a HardhatError if the value isn't a valid private key.
 */
export declare function getPrivateKey(variable: ResolvedConfigurationVariable): Promise<string>;
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