/**
 * An part item of file.
 */
interface IFilePartItem {
    /**
     * Sequence no of a part.
     */
    sid: number;
    /**
     * Start position of a part in sourcefile.
     */
    start: number;
    /**
     * End position of a part in sourcefile.
     */
    end: number;
}

interface IBigFileHelperOptions {
    /**
     * The suffix name of a file part.
     * @default '.ghc-part'
     */
    readonly partCodePrefix?: string;
}
/**
 * Inspired by https://github.com/tomvlk/node-split-file.
 */
declare class BigFileHelper {
    readonly partCodePrefix: string;
    private readonly _encoding;
    constructor(options?: IBigFileHelperOptions);
    /**
     * Calculate the name of parts of sourcefile respectively.
     *
     * @param filepath
     * @param parts
     * @returns
     */
    calcPartFilepaths(filepath: string, parts: IFilePartItem[]): string[];
    /**
     * Split file with part descriptions.
     */
    split(filepath: string, parts: IFilePartItem[], outputFilepath?: string): Promise<string[]>;
    /**
     * Merge files
     *
     * @param inputFilepaths
     * @param outputFilepath
     */
    merge(inputFilepaths: string[], outputFilepath: string): Promise<void>;
}
declare const bigFileHelper: BigFileHelper;

/**
 * Generate file part items by part size.
 *
 * @param fileSize
 * @param _partSize
 * @returns
 */
declare function calcFilePartItemsBySize(fileSize: number, _partSize: number): IFilePartItem[];
/**
 * Generate file part items by total of parts.
 *
 * @param filepath
 * @param _partTotal
 * @returns
 */
declare function calcFilePartItemsByCount(fileSize: number, _partTotal: number): IFilePartItem[];
/**
 * Calculate names of parts of sourcefile respectively.
 *
 * @param parts
 * @param partCodePrefix
 * @returns
 */
declare function calcFilePartNames(parts: ReadonlyArray<Pick<IFilePartItem, 'sid'>>, partCodePrefix: string): string[];

export { BigFileHelper, type IBigFileHelperOptions, type IFilePartItem, bigFileHelper, calcFilePartItemsByCount, calcFilePartItemsBySize, calcFilePartNames };