import type { Backend } from "lucarne";
import { type ChildProcess } from "node:child_process";
type SpawnBrowser = (command: string, args: readonly string[], options: {
    env: NodeJS.ProcessEnv;
    stdio: ["ignore", "ignore", "pipe"];
}) => ChildProcess;
type NativeBackendDependencies = {
    closeBrowser?: (cdpUrl: string) => Promise<void>;
    spawnBrowser?: SpawnBrowser;
    waitForCdp?: (host: string, port: number) => Promise<void>;
};
type BrowserEnvironmentOptions = {
    platform?: NodeJS.Platform;
    sessionBusExists?: (path: string) => boolean;
    uid?: number;
};
/**
 * Lucarne's native-backend seam with ownership-safe startup rollback.
 *
 * Lucarne only receives a BackendHandle after start() resolves. If Chromium is
 * spawned and CDP then fails to appear, a backend that simply throws has lost the
 * only process handle and the engine cannot clean it up. Keep the child here and
 * tear it down before propagating the startup error.
 */
export declare function createBrowserNativeBackend(dependencies?: NativeBackendDependencies): Backend;
export declare function browserProcessEnvironment(source: NodeJS.ProcessEnv, options?: BrowserEnvironmentOptions): NodeJS.ProcessEnv;
export declare function contentSafeChromeDiagnostic(value: string): string;
export {};