/**
 * Reads a file if it exists, or just return `undefined`.
 *
 * @category Node : File
 * @category Package : @augment-vir/node
 * @returns The file contents as a string if the file exists, otherwise `undefined`.
 * @package [`@augment-vir/node`](https://www.npmjs.com/package/@augment-vir/node)
 */
export declare function readFileIfExists(path: string): Promise<string | undefined>;