/**
 * Encodes an object into a URL-encoded query string.
 *
 * Similar to native `URLSearchParams` but with key differences:
 * - **Same behavior for strings and numbers**: Both are handled identically to native implementation
 * - **Different for arrays and objects**: Automatically converts complex values to JSON strings
 *   - Arrays: `[1,2,3]` becomes `"[1,2,3]"` (vs native: `"1,2,3"`)
 *   - Objects: `{a:1}` becomes `'{"a":1}'` (vs native: `"[object Object]"`)
 * - **Encoding differences**: Uses lowercase hex (`%3d`) and `%20` for spaces (vs native: `%3D` and `+`)
 * - **Null values**: Converts `null` to the string `"null"` (same as native behavior)
 *
 * @param o - Object to encode into query string
 * @returns URL-encoded query string
 *
 * @example
 * ```typescript
 * urlEncode({ name: 'john', age: 25 }) // "name=john&age=25"
 * urlEncode({ items: [1,2,3] }) // "items=%5b1%2c2%2c3%5d"
 * urlEncode({ user: { id: 1, username: 'tester' } }) // "user=%7b%22id%22%3a1%2c%22username%22%3a%22tester%22%7d"
 * ```
 */
export declare function urlEncode(o: object): string;
export declare function decodeUTF16BE(buffer: Buffer): string;
export declare function encodeUTF16BE(text: string): Buffer;
/**
 * convert between BE (big endian) and LE (little endian)
 */
export declare function swapBytes(buffer: Buffer): void;