/**
 * @param fn function which returns a promise of a value
 * @param defaultValue fallback to use when the promise rejects or function throws
 */
export declare function tryOr<T, D = undefined>(fn: () => Promise<T>, defaultValue?: D | Promise<D>): Promise<T | D>;
/**
 * @param fn function which returns a value
 * @param defaultValue fallback to use when the function throws
 */
export declare function tryOr<T, D = undefined>(fn: () => T, defaultValue?: D): T | D;