import type { MessageEventLike, PostTarget, Transport, WindowLike } from "./types.js";
/** Native platform detected for the current WebView. */
export type NativePlatform = "ios" | "android";
/**
 * Detect whether the content is running inside a native WebView that exposes the
 * RevenueCat host channel.
 *
 * - iOS if `typeof window.webkit.messageHandlers.rcWebComponents.postMessage === "function"`.
 * - Android if `typeof window.rcWebComponents.postMessage === "function"`.
 * - otherwise `null` (plain web).
 */
export declare function detectNativeHost(win: WindowLike | undefined): NativePlatform | null;
/**
 * Web transport: today's behavior. Listens for `message` events on `self` and
 * posts to a target window/origin. Origin/source are surfaced on each inbound
 * event so the bridge can enforce them.
 */
export declare class WindowTransport implements Transport {
    readonly trustedPeer = false;
    private readonly self;
    private listener;
    constructor(self: WindowLike);
    subscribe(onFrame: (event: MessageEventLike) => void): void;
    post(frame: unknown, target: PostTarget): void;
    destroy(): void;
}
/**
 * Native transport (iOS WKWebView / Android WebView). The native host is the sole
 * trusted peer.
 *
 * - JS -> native: `postMessage(JSON.stringify(frame))` — ALWAYS a string, for
 *   Android `@JavascriptInterface` / `WebMessageListener` compatibility.
 * - native -> JS: native calls the installed global
 *   `window.__rcWebComponentsReceive(data)` with a JSON string or a parsed object.
 */
export declare class NativeTransport implements Transport {
    readonly trustedPeer = true;
    private readonly globals;
    private readonly platform;
    constructor(win: WindowLike, platform?: NativePlatform);
    subscribe(onFrame: (event: MessageEventLike) => void): void;
    post(frame: unknown, _target: PostTarget): void;
    destroy(): void;
}
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