/// <reference types="node" />
import EventEmitter from "events";
import type { DeviceModel } from "@ledgerhq/devices";
import { TransportError, StatusCodes, getAltStatusMessage, TransportStatusError } from "@ledgerhq/errors";
export { TransportError, TransportStatusError, StatusCodes, getAltStatusMessage, };
/**
 */
export declare type Subscription = {
    unsubscribe: () => void;
};
/**
 */
export declare type Device = any;
export declare type DescriptorEventType = "add" | "remove";
/**
 * type: add or remove event
 * descriptor: a parameter that can be passed to open(descriptor)
 * deviceModel: device info on the model (is it a nano s, nano x, ...)
 * device: transport specific device info
 */
export interface DescriptorEvent<Descriptor> {
    type: DescriptorEventType;
    descriptor: Descriptor;
    deviceModel?: DeviceModel | null | undefined;
    device?: Device;
}
/**
 */
export declare type Observer<Ev> = Readonly<{
    next: (event: Ev) => unknown;
    error: (e: any) => unknown;
    complete: () => unknown;
}>;
/**
 * Transport defines the generic interface to share between node/u2f impl
 * A **Descriptor** is a parametric type that is up to be determined for the implementation.
 * it can be for instance an ID, an file path, a URL,...
 */
export default class Transport {
    exchangeTimeout: number;
    unresponsiveTimeout: number;
    deviceModel: DeviceModel | null | undefined;
    /**
     * Statically check if a transport is supported on the user's platform/browser.
     */
    static readonly isSupported: () => Promise<boolean>;
    /**
     * List once all available descriptors. For a better granularity, checkout `listen()`.
     * @return a promise of descriptors
     * @example
     * TransportFoo.list().then(descriptors => ...)
     */
    static readonly list: () => Promise<Array<any>>;
    /**
     * Listen all device events for a given Transport. The method takes an Obverver of DescriptorEvent and returns a Subscription (according to Observable paradigm https://github.com/tc39/proposal-observable )
     * a DescriptorEvent is a `{ descriptor, type }` object. type can be `"add"` or `"remove"` and descriptor is a value you can pass to `open(descriptor)`.
     * each listen() call will first emit all potential device already connected and then will emit events can come over times,
     * for instance if you plug a USB device after listen() or a bluetooth device become discoverable.
     * @param observer is an object with a next, error and complete function (compatible with observer pattern)
     * @return a Subscription object on which you can `.unsubscribe()` to stop listening descriptors.
     * @example
    const sub = TransportFoo.listen({
    next: e => {
      if (e.type==="add") {
        sub.unsubscribe();
        const transport = await TransportFoo.open(e.descriptor);
        ...
      }
    },
    error: error => {},
    complete: () => {}
    })
     */
    static readonly listen: (observer: Observer<DescriptorEvent<any>>) => Subscription;
    /**
     * attempt to create a Transport instance with potentially a descriptor.
     * @param descriptor: the descriptor to open the transport with.
     * @param timeout: an optional timeout
     * @return a Promise of Transport instance
     * @example
    TransportFoo.open(descriptor).then(transport => ...)
     */
    static readonly open: (descriptor?: any, timeout?: number) => Promise<Transport>;
    /**
     * low level api to communicate with the device
     * This method is for implementations to implement but should not be directly called.
     * Instead, the recommanded way is to use send() method
     * @param apdu the data to send
     * @return a Promise of response data
     */
    exchange(_apdu: Buffer): Promise<Buffer>;
    /**
     * set the "scramble key" for the next exchanges with the device.
     * Each App can have a different scramble key and they internally will set it at instanciation.
     * @param key the scramble key
     */
    setScrambleKey(_key: string): void;
    /**
     * close the exchange with the device.
     * @return a Promise that ends when the transport is closed.
     */
    close(): Promise<void>;
    _events: EventEmitter;
    /**
     * Listen to an event on an instance of transport.
     * Transport implementation can have specific events. Here is the common events:
     * * `"disconnect"` : triggered if Transport is disconnected
     */
    on(eventName: string, cb: (...args: Array<any>) => any): void;
    /**
     * Stop listening to an event on an instance of transport.
     */
    off(eventName: string, cb: (...args: Array<any>) => any): void;
    emit(event: string, ...args: any): void;
    /**
     * Enable or not logs of the binary exchange
     */
    setDebugMode(): void;
    /**
     * Set a timeout (in milliseconds) for the exchange call. Only some transport might implement it. (e.g. U2F)
     */
    setExchangeTimeout(exchangeTimeout: number): void;
    /**
     * Define the delay before emitting "unresponsive" on an exchange that does not respond
     */
    setExchangeUnresponsiveTimeout(unresponsiveTimeout: number): void;
    /**
     * wrapper on top of exchange to simplify work of the implementation.
     * @param cla
     * @param ins
     * @param p1
     * @param p2
     * @param data
     * @param statusList is a list of accepted status code (shorts). [0x9000] by default
     * @return a Promise of response buffer
     */
    send: (cla: number, ins: number, p1: number, p2: number, data?: Buffer, statusList?: Array<number>) => Promise<Buffer>;
    /**
     * create() allows to open the first descriptor available or
     * throw if there is none or if timeout is reached.
     * This is a light helper, alternative to using listen() and open() (that you may need for any more advanced usecase)
     * @example
    TransportFoo.create().then(transport => ...)
     */
    static create(openTimeout?: number, listenTimeout?: number): Promise<Transport>;
    exchangeBusyPromise: Promise<void> | null | undefined;
    exchangeAtomicImpl: (f: () => Promise<Buffer | void>) => Promise<Buffer | void>;
    decorateAppAPIMethods(self: Record<string, any>, methods: Array<string>, scrambleKey: string): void;
    _appAPIlock: string | null;
    decorateAppAPIMethod<R, A extends any[]>(methodName: string, f: (...args: A) => Promise<R>, ctx: any, scrambleKey: string): (...args: A) => Promise<R>;
    static ErrorMessage_ListenTimeout: string;
    static ErrorMessage_NoDeviceFound: string;
}
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