/**
 * CLI Authentication Helper
 *
 * Provides `--auth` flow:
 *   1. Opens the Metrx signup/key page in the user's browser
 *   2. Prompts for the API key via stdin
 *   3. Validates the key with a ping
 *   4. Saves to ~/.metrxrc as JSON { "api_key": "sk_live_..." }
 *
 * The saved key is read at startup so users don't need to set env vars.
 */
export declare function getRcPath(): string;
export interface RcConfig {
    api_key?: string;
}
export declare function readRcFile(): RcConfig | null;
/**
 * Load API key from environment or ~/.metrxrc.
 * Priority: METRX_API_KEY env var > ~/.metrxrc > null
 */
export declare function loadApiKey(): string | null;
export declare function writeRcFile(apiKey: string): void;
export declare function isValidKeyFormat(key: string): boolean;
export declare function runAuthFlow(): Promise<void>;
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