import type { GTFSFileInfo } from '../../file-info.d.ts';
import type { GTFSFileRow } from '../../types.d.ts';
/**
 * Parameter for readChunk()
 */
export type ReadChunkParam<RowType extends GTFSFileRow = GTFSFileRow> = {
    /** GTFS file information, to be defined once. */
    file: GTFSFileInfo;
    /** Columns (table header), array if have been read, undefined if not yet. The method alters this property. */
    columns: string[] | undefined;
    /** Input, to redefine this property before calling GTFSFileIO.readChunk. */
    chunk: string;
    /** Output, this will get set by the method. */
    records: RowType[];
    /**
     * Input, leave as is or set to undefine for the last iteration.
     * It contains string (or empty string) when there is left over string from the previous iteration to prepend to the current chunk.
     * It contains undefuned for the last iteration.
     */
    leftOver: string | undefined;
};
/**
 * Get initial state of read chunk parameters.
 * @param file File information
 * @returns Object of chunk reading parameters in the initial state
 */
export declare function getInitialReadChunkParams<RowType extends GTFSFileRow = GTFSFileRow>(file: GTFSFileInfo): ReadChunkParam<RowType>;
/**
 * Read chunk to records, this alter params object in the argument.
 * @param params Chunk reading parameters
 */
export declare function readChunk<RowType extends GTFSFileRow = GTFSFileRow>(params: ReadChunkParam<RowType>): void;
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