import type { IWorkerIO } from './defs';
import type { IOutputCallback } from '../callback';
import { Termios } from '../termios';
export declare abstract class WorkerIO implements IWorkerIO {
    readonly outputCallback: IOutputCallback;
    readonly termios: Termios.Termios;
    constructor(outputCallback: IOutputCallback, termios: Termios.Termios);
    canEnable(): Promise<void>;
    disable(): Promise<void>;
    enable(): Promise<void>;
    get enabled(): boolean;
    pollInput(timeoutMs: number): boolean;
    read(maxChars: number | null): number[];
    readAsync(maxChars: number | null, timeoutMs: number): Promise<number[]>;
    utf8ArrayToString(chars: Int8Array): string;
    write(text: string | Int8Array | number[]): void;
    protected _canReturnNow(): boolean;
    protected abstract _getStdin(timeoutMs: number): string;
    protected abstract _getStdinAsync(timeoutMs: number): Promise<string>;
    protected _isLineBuffering(): boolean;
    protected _maybeEchoToOutput(chars: number[]): void;
    protected _postRead(chars: string): void;
    protected _processReadChars(chars: number[]): void;
    protected _processWriteChars(chars: Int8Array | number[]): number[];
    /**
     * Extract and return up to maxChars from _readBuffer, or all characters if maxChars is null,
     * leaving the remainder in the buffer.
     * _readBuffer may or may not be empty when this is called.
     */
    protected _readFromBuffer(maxChars: number | null): number[];
    private _available?;
    protected _enabled: boolean;
    private _inAlternativeBuffer;
    private _utf8Decoder?;
    protected _writeColumn: number;
    protected _readBuffer: number[];
}