/**
 * Finds the instances of an executable in the system path.
 */
export declare class Finder {
    #private;
    /**
     * The list of executable file extensions.
     */
    readonly extensions: Set<string>;
    /**
     * The list of system paths.
     */
    readonly paths: Set<string>;
    /**
     * Creates a new finder.
     * @param options An object providing values to initialize this instance.
     */
    constructor(options?: FinderOptions);
    /**
     * Value indicating whether the current platform is Windows.
     */
    static get isWindows(): boolean;
    /**
     * Finds the instances of an executable in the system path.
     * @param command The command to be resolved.
     * @returns The paths of the executables found.
     */
    find(command: string): AsyncGenerator<string, void, void>;
    /**
     * Gets a value indicating whether the specified file is executable.
     * @param file The path of the file to be checked.
     * @returns `true` if the specified file is executable, otherwise `false`.
     */
    isExecutable(file: string): Promise<boolean>;
}
/**
 * Defines the options of a {@link Finder} instance.
 */
export type FinderOptions = Partial<{
    /**
     * The list of executable file extensions.
     */
    extensions: string[];
    /**
     * The list of system paths.
     */
    paths: string[];
}>;
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