interface BrowserProcess {
    once(event: "error", listener: (error: Error) => void): this;
    once(event: "close", listener: (code: number | null, signal: NodeJS.Signals | null) => void): this;
    unref(): void;
}
type SpawnBrowserProcess = (command: string, args: string[], options: {
    detached: true;
    stdio: "ignore";
}) => BrowserProcess;
export interface OpenExternalOptions {
    platform?: NodeJS.Platform;
    spawnProcess?: SpawnBrowserProcess;
}
export declare function openExternal(url: string, options?: OpenExternalOptions): Promise<void>;
export {};