import { InputSource } from './types';
/**
 * Check if data is being piped via stdin
 */
export declare function hasStdin(): boolean;
/**
 * Read from stdin
 */
export declare function readStdin(): Promise<string>;
/**
 * Read from file
 */
export declare function readFile(filePath: string): string;
/**
 * Determine input source and read data
 */
export declare function getInputSource(args: Array<string | number>): Promise<InputSource>;
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