/**
 * Widevine CDM hint-file seeding for persistent contexts.
 * Mirrors Python cloakbrowser/widevine.py.
 *
 * CloakBrowser's binary supports Widevine but ships no CDM (proprietary, can't
 * redistribute). Users sideload it by copying a `WidevineCdm/` directory from a
 * real Chrome install next to the binary (see issue #96). Chromium reads a
 * "hint file" from the user-data-dir at early startup to register the CDM, but
 * on a fresh profile it doesn't exist yet, and Playwright disables the component
 * updater that would write it. This seeds the hint file before launch so a
 * sideloaded CDM works on the first run. It never bundles, downloads, or copies
 * the CDM — only writes the hint when a user-provided CDM is already present.
 *
 * Linux only: Chromium's hint-file mechanism is Linux/ChromeOS-specific.
 */
/**
 * Locate a sideloaded Widevine CDM directory, or null if absent.
 *
 * Resolution order:
 *   1. If CLOAKBROWSER_WIDEVINE_CDM is set, it is used exclusively (overrides
 *      auto-detection). An invalid value (no `manifest.json`) skips seeding.
 *   2. `<dir of the chrome binary>/WidevineCdm` — a manual sideload, per version.
 *   3. `<cache dir>/WidevineCdm` (`~/.cloakbrowser/WidevineCdm`) — the
 *      version-independent location the Docker auto-fetch and fetch-widevine.py
 *      write to. This fallback lets one fetched CDM serve any binary (free or
 *      Pro, any version) with no env var — the CDM `.so` is arch- not version-specific.
 *
 * A directory counts only if it contains `manifest.json`. The returned path is
 * absolute and symlink-resolved (mirrors Python's Path.resolve()).
 * @internal Exported for testing.
 */
export declare function resolveWidevineCdmDir(binaryPath: string): string | null;
/**
 * Write the Widevine CDM hint file into a persistent profile before launch.
 * `binaryPath` is the resolved chrome executable; the CDM is looked for next to
 * it. No-op on non-Linux, when disabled via CLOAKBROWSER_WIDEVINE, or when no
 * sideloaded CDM is present. Never throws — a failure must not break launch.
 */
export declare function seedWidevineHint(userDataDir: string, binaryPath: string): void;
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