/// <reference types="node" />
import execa from 'execa';
import { promises as fs } from 'fs';
/**
 * Quality (i.e. release channel) of discovered binary.
 */
export declare const enum Quality {
    Canary = "canary",
    Stable = "stable",
    Beta = "beta",
    Dev = "dev",
    Custom = "custom"
}
/**
 * All known qualities.
 */
export declare const allQualities: ReadonlySet<Quality>;
/**
 * Gets whether given string is a known Quality.
 */
export declare const isQuality: (input: string) => input is Quality;
/**
 * Discovered browser binary.
 */
export interface IExecutable {
    path: string;
    quality: Quality;
}
export interface IBrowserFinder {
    /**
     * Finds the first browser on the platform where the predicate matches.
     * May return early.
     */
    findWhere(predicate: (exe: IExecutable) => boolean): Promise<IExecutable | undefined>;
    /**
     * Finds all browser executables available on the current platform.
     */
    findAll(): Promise<IExecutable[]>;
}
export declare type BrowserFinderCtor = new (env?: NodeJS.ProcessEnv, _fs?: typeof fs, _execa?: typeof execa) => IBrowserFinder;
/**
 * Chrome finder class for the current platform.
 */
export declare const ChromeBrowserFinder: BrowserFinderCtor;
/**
 * Edge finder class for the current platform.
 */
export declare const EdgeBrowserFinder: BrowserFinderCtor;
/**
 * Firefox finder class for the current platform.
 */
export declare const FirefoxBrowserFinder: BrowserFinderCtor;