import { Progress } from "../Progress";
import { Timestamp } from "../Types";
import { JSONStream } from "../parse/JSONStream";
/** Our interface for input files. Environment agnostic */
export interface FileInput {
    name: string;
    size: number;
    lastModified: number;
    slice(start?: number, end?: number): Promise<ArrayBuffer>;
}
/** Wraps a string into our file abstraction. Useful for testing */
export declare const wrapStringAsFile: (content: string) => FileInput;
/** Streams a file into a JSONStream in 2MB chunks, optionally providing progress */
export declare const streamJSONFromFile: (stream: JSONStream, file: FileInput, progress?: Progress) => AsyncGenerator<void>;
/**
 * Tries to find a timestamp at the end of a file, using the provided regex. The regex must have a capture group.
 * It can detect ISO 8601 dates and unix timestamps.
 *
 * This is useful to compute how up-to-date a file is before parsing it, so we can always keep the latest information (e.g. nicknames)
 */
export declare const tryToFindTimestampAtEnd: (regex: RegExp, file: FileInput) => Promise<Timestamp | undefined>;