/**
 * Copyright Microsoft Corporation. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { EventEmitter } from 'events';
export type ProcessExitData = {
    unexpectedly: boolean;
    code: number | null;
    signal: NodeJS.Signals | null;
};
export declare class ProcessHost extends EventEmitter {
    private process;
    private _didSendStop;
    private _processDidExit;
    private _didExitAndRanOnExit;
    private _entryScript;
    private _lastMessageId;
    private _callbacks;
    private _processName;
    private _producedEnv;
    private _extraEnv;
    private _requestHandlers;
    constructor(entryScript: string, processName: string, env: Record<string, string | undefined>);
    startRunner(runnerParams: any, options?: {
        onStdOut?: (chunk: Buffer | string) => void;
        onStdErr?: (chunk: Buffer | string) => void;
    }): Promise<ProcessExitData | undefined>;
    sendMessage(message: {
        method: string;
        params?: any;
    }): Promise<unknown>;
    protected sendMessageNoReply(message: {
        method: string;
        params?: any;
    }): void;
    protected onExit(): Promise<void>;
    onRequest(method: string, handler: (params?: any) => Promise<any>): void;
    stop(): Promise<void>;
    didSendStop(): boolean;
    producedEnv(): Record<string, string | undefined>;
    private send;
}
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