import type { ISignal } from '@lumino/signaling';
import type { ISize } from './callback';
import type { IShell } from './defs';
import type { IExternalTabCompleteResult } from './external_command';
import type { Termios } from './termios';
/**
 * Abstract base class for Shell that external libraries use.
 * It communicates with the real shell that runs in a web worker.
 */
export declare abstract class BaseShell implements IShell {
    constructor(options: IShell.IOptions);
    /**
     * Load the web worker.
     */
    protected abstract initWorker(options: IShell.IOptions): Worker;
    /**
     * Call an external command, i.e. one that runs in the browser UI thread.
     */
    callExternalCommand(name: string, args: string[], environment: {
        [key: string]: string;
    }, stdinIsTerminal: boolean, stdoutIsTerminal: boolean, stderrIsTerminal: boolean, termiosFlags: Termios.IFlags): Promise<{
        exitCode: number;
        environmentChanges?: {
            [key: string]: string | undefined;
        };
    }>;
    /**
     * Call tab completion for an external command.
     */
    callExternalTabComplete(name: string, args: string[]): Promise<IExternalTabCompleteResult>;
    dispose(): void;
    get disposed(): ISignal<this, void>;
    downloadWasmModuleCallback(packageName: string, moduleName: string, start: boolean): void;
    exitCode(): Promise<number>;
    get isDisposed(): boolean;
    private enableBufferedStdinCallback;
    input(char: string): Promise<void>;
    /**
     * A promise that is fulfilled when the terminal is ready to be started.
     */
    get ready(): Promise<void>;
    /**
     * Set shell size.  Overloaded to take an `ISize` object or `rows` and `columns`.
     * The former is the recommended approach, the latter was the original implementation and should
     * be considered deprecated for eventual removal.
     */
    setSize(size: ISize): Promise<void>;
    setSize(rows: number, columns: number): Promise<void>;
    get shellId(): string;
    get size(): ISize;
    start(): Promise<void>;
    themeChange(isDark?: boolean): Promise<void>;
    private _initialize;
    private _initRemote;
    private _serviceWorkerHandleStdin;
    private _setMainIO;
    private _setSizeImpl;
    private _disposed;
    private _isDisposed;
    private _ready;
    private _shellId;
    private _size;
    private _worker?;
    private _remote?;
    private _externalCommands;
    private _serviceWorkerMainIO?;
    private _sharedArrayBufferMainIO?;
    private _mainIO?;
    private _downloadTracker?;
    private _outputCallback;
}