import { Helia } from '@helia/interface';
import { CID } from 'multiformats';
export declare function ensureLeadingSlash(str: string): string;
/**
 * When migrating to typescript and removing redux-bundler, a lot of old code
 * had checks like `path ? path : null` which would fire as "false" when the
 * path was an empty string. This function helps the migration path but should
 * be removed once all the old code is updated.
 */
export declare function isFalsy<T>(str: T | null | string | undefined): str is null;
export declare function isTruthy<T>(str: T | null | string | undefined): str is string;
export declare function addDagNodeToHelia<T>(helia: Helia, codecName: string, node: T, hasherCode?: number): Promise<CID>;