/**
 * Browser-channel selection with safe fallback (issues #13 + #19).
 *
 * Patchright launches `channel: "chrome"` by default, which talks to the
 * system Chrome install. Two failure modes hit users:
 *   - macOS 26 (Tahoe) ships a Chrome binary that crashes on launch in
 *     headless mode (issue #13).
 *   - Windows 11 reports `Chrome exited immediately with exit code 21`
 *     when the persistent profile is locked or the channel binary is
 *     missing (issue #19).
 *
 * Patchright bundles its own Chromium build, which avoids both. We let users
 * pick explicitly via `BROWSER_CHANNEL` / `NOTEBOOKLM_BROWSER_CHANNEL` and
 * fall back to bundled Chromium if Chrome refuses to launch.
 */
export type BrowserChannel = "chrome" | "chromium";
export declare function getPreferredChannel(): BrowserChannel;
export declare function isChannelFailure(error: unknown): boolean;
/**
 * Wrap an existing launch options object with the chosen channel. `chromium`
 * means "no channel" — the bundled binary is selected by omitting the field.
 */
export declare function withChannel<T extends Record<string, unknown>>(options: T, channel: BrowserChannel): T;
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