import { Result } from './result';
export declare function exist(filename: string): Promise<boolean>;
export declare function hasFile(filename: string): Promise<boolean>;
export declare function hasDirectory(filename: string): Promise<boolean>;
export declare function scanRecursively(args: {
    entryPath: string;
    onFile?: (filename: string, basename: string) => Result<void>;
    onDir?: (dirname: string, basename: string) => Result<void>;
    onComplete?: () => Result<void>;
    dereferenceSymbolicLinks?: boolean;
    skipDir?: (dirname: string, basename: string) => boolean;
}): Promise<void>;
export declare function scanRecursivelySync(args: {
    entryPath: string;
    onFile?: (filename: string, basename: string) => void;
    onDir?: (dirname: string, basename: string) => void;
    onComplete?: () => void;
    dereferenceSymbolicLinks?: boolean;
    skipDir?: (dirname: string, basename: string) => boolean;
}): void;
export declare function readJsonFile(file: string): Promise<any>;
export declare function readJsonFileSync(file: string): any;
export declare function writeJsonFile(file: string, value: any, options?: {
    format?: boolean;
}): Promise<void>;
export declare function writeJsonFileSync(file: string, value: any, options?: {
    format?: boolean;
}): void;
export type IterateFileByLineOptions = {
    encoding?: BufferEncoding;
    batchSize?: number;
    close?: () => void;
};
/**
 * linefeed "\n" is omitted from the yielded value
 * but "\r" if exists is preserved as is
 * */
export declare function iterateFileByLine(file: string, options?: IterateFileByLineOptions): Generator<string>;
export declare function verboseWriteFileSync(file: string, content: string | Buffer): void;
/**
 * @description skip metadata files, e.g. .DS_Store
 */
export declare function getDirFilenamesSync(dir: string): string[];
/**
 * @description skip metadata files, e.g. .DS_Store
 */
export declare function getDirFilenames(dir: string): Promise<string[]>;
/**
 * @description check for metadata files, e.g. .DS_Store, *.swp, *.swo, .~lock.*#, *.ext~
 */
export declare function isMetadataFilename(filename: string): boolean;