import { SshServiceConstructor } from './sshService';
/**
 * Decorator applied to suclasses of `SshService` that declares how the service gets activated.
 */
export declare function serviceActivation(activation: ServiceActivation): (constructor: Function) => void;
/**
 * Rules for how a service gets activated for an SSH session.
 */
export interface ServiceActivation {
    /**
     * Activate the service when a service request is received for the specified name.
     *
     * Only server-side services can be activated using a service request from the client.
     * (Other activation methods can work in either direction.)
     */
    readonly serviceRequest?: string;
    /**
     * Activate the service when a session request is received for the specified request type.
     */
    readonly sessionRequest?: string;
    /**
     * Activate the service when a request is received to open a channel of the specified
     * channel type.
     */
    readonly channelType?: string;
    /**
     * Activate the service when a channel request is received for the specified channel
     * request type.
     *
     * If both `channelType` and `channelRequest` are set, then the service is activated only
     * when the specified request is received on the specified channel type.
     */
    readonly channelRequest?: string;
}
/**
 * Locates a service type in configuration, using a predicate to check service activation
 * attributes.
 *
 * @param serviceConfigs Service configuration dictionary from `SshSessionConfiguration.services`.
 * @param predicate Function to test whether a service activation attribute matches some condition.
 * @returns Service type (constructor), or null if no service type satisfies the predicate.
 */
export declare function findService(serviceConfigs: Map<SshServiceConstructor, any>, predicate: (activation: ServiceActivation) => boolean): SshServiceConstructor | null;
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