export interface KeyDiscoveryResult {
    value: string | undefined;
    source: 'env' | 'dotenv' | undefined;
}
/**
 * Finds a verifier key wherever it legitimately lives: the process env first,
 * then a `.env` file at the repo root (`cwd`). No OS keychain support and no
 * new runtime dependency — this repo has a zero-runtime-dependency bias.
 */
export declare function discoverKey(varName: string, env: NodeJS.ProcessEnv, cwd: string): KeyDiscoveryResult;
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