/** Detect if file is csv or json
 *
 * ## Usage
 *
 * ```typescript
 * const csvContent = `
 * name,age,city
 * Alice,30,New York
 * Bob,25,San Francisco
 * `;
 *
 * const jsonContent = `
 * [
 *   { "name": "Alice", "age": 30, "city": "New York" },
 *   { "name": "Bob", "age": 25, "city": "San Francisco" }
 * ]
 * `;
 *
 * console.log('Is CSV (csvContent):', isCsv(csvContent)); // Output: true
 * console.log('Is CSV (jsonContent):', isCsv(jsonContent)); // Output: false
 * console.log('Is JSON (csvContent):', isJson(csvContent)); // Output: false
 * console.log('Is JSON (jsonContent):', isJson(jsonContent)); // Output: true
 * ```
 */
export declare function isCsv(content: string): boolean;
export declare function isJson(content: string): boolean;