/**
 * Capture a PNG screenshot of an Electron app via Playwright over CDP.
 *
 * Targeting precedence (matches `electron_*` tools that share `targetId` /
 * `windowTitle` — see `src/commands/shared/window-target.ts`):
 *   1. `targetId` — exact CDP target match across every running app.
 *   2. `windowTitle` — first app with a target whose title matches (case-
 *      insensitive substring).
 *   3. neither — first app returned by `scanForElectronApps`.
 *
 * Without `targetId`, parallel Electron apps (skills-desktop on :9222 and
 * qa-fixture on :9223, for example) can collide on `apps[0]` and silently
 * return the wrong app's screenshot — that's the bug fixed in #18.
 *
 * @param options.outputPath  Optional path to save the PNG (and an
 *   `.encrypted` companion). When omitted, returns base64 only.
 * @param options.windowTitle Case-insensitive substring matched against page
 *   titles. Used both to pick the app and to pick the right page within it.
 * @param options.targetId    Exact CDP target ID. Wins over `windowTitle`.
 */
export declare function takeScreenshot(options: {
    outputPath?: string;
    windowTitle?: string;
    targetId?: string;
}): Promise<{
    filePath?: string;
    base64: string;
    data: string;
    error?: string;
}>;