/// <reference types="node" />
import { Quality, IExecutable, IBrowserFinder } from '.';
import _execa from 'execa';
import { promises as fsPromises } from 'fs';
import { IPriority } from './util';
/**
 * Base class providing utilities for the Darwin browser finders.
 */
export declare abstract class DarwinFinderBase implements IBrowserFinder {
    protected readonly env: NodeJS.ProcessEnv;
    private readonly fs;
    private readonly execa;
    protected lsRegisterCommand: string;
    /**
     * Well-known paths to browsers on Chrome. This is used to make finding fast
     * in the common case, avoiding sometimes-slow launch services.
     * @see https://github.com/microsoft/vscode-js-debug/issues/570
     */
    protected wellKnownPaths: ReadonlyArray<IExecutable>;
    private foundAll;
    constructor(env?: NodeJS.ProcessEnv, fs?: typeof fsPromises, execa?: typeof _execa);
    /**
     * @inheritdoc
     */
    findWhere(predicate: (exe: IExecutable) => boolean): Promise<IExecutable | undefined>;
    /**
     * @inheritdoc
     */
    findAll(): Promise<IExecutable[]>;
    /**
     * findAll implementation. Cached.
     */
    protected abstract findAllInner(): Promise<IExecutable[]>;
    /**
     * Returns the environment-configured custom path, if any.
     */
    protected abstract getPreferredPath(): string | undefined;
    /**
     * Finds apps matching the given pattern in the launch service register.
     */
    protected findLaunchRegisteredApps(pattern: string, defaultPaths: ReadonlyArray<string>, suffixes: ReadonlyArray<string>): Promise<Set<string>>;
    /**
     * Creates priorities for the {@link sort} function that places browsers
     * in proper order based on their installed location./
     */
    protected createPriorities(priorities: {
        name: string;
        weight: number;
        quality: Quality;
    }[]): IPriority[];
}