import { api } from '@jsii/kernel';
import { SyncStdio } from './sync-stdio';
export declare type Output = {
    hello: string;
} | {
    ok: api.KernelResponse;
} | {
    callback: api.Callback;
} | {
    pending: true;
} | {
    error: string;
    stack?: string;
};
export declare type Input = ({
    api: string;
} & api.KernelRequest) | {
    complete: api.CompleteRequest;
};
export declare type Exit = {
    exit: number;
};
/**
 * An IO provider for jsii API exchanges.
 */
export interface IInputOutput {
    /**
     * Writes a message to the jsii API host.
     * @param message the message to be sent.
     */
    write(message: Output): void;
    /**
     * Wait for a message from the jsii API host, then return it.
     *
     * @returns the received message, or `undefined` if the API host has no more
     *          requests to send.
     */
    read(): Input | Exit | undefined;
}
export declare class InputOutput implements IInputOutput {
    private readonly stdio;
    debug: boolean;
    constructor(stdio: SyncStdio);
    write(obj: Output): void;
    read(): Input | undefined;
}
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