import type { Readable } from 'node:stream';
export interface StdinLike extends AsyncIterable<string | Buffer> {
    isTTY?: boolean | undefined;
}
/**
 * Read request params piped into the CLI, e.g.,
 *
 * ```
 * $ echo '{"device_id": "..."}' | seam locks unlock-door --json
 * $ seam locks unlock-door --json < params.json
 * ```
 *
 * Returns null when stdin is a terminal or is empty,
 * so an interactive session is never blocked waiting for input.
 */
export declare const readStdinJson: (stdin?: StdinLike | Readable) => Promise<Record<string, unknown> | null>;
/**
 * Parse JSON request params, e.g., from stdin or `--json '{"limit": 2}'`.
 *
 * Returns null when there is nothing to parse.
 */
export declare const parseJsonParams: (raw: string, source: string) => Record<string, unknown> | null;