app_for_reddit/Reddit App/Managers/RedditLoginScriptBridge.swift

import WebKit

@MainActor
final class RedditLoginScriptBridge: NSObject, WKScriptMessageHandler {
    static let shared = RedditLoginScriptBridge()

    var onLoginRequested: (() -> Void)?

    private override init() {
        super.init()
    }

    func userContentController(
        _ userContentController: WKUserContentController,
        didReceive message: WKScriptMessage
    ) {
        guard message.name == RedditLoginBridgeStyle.messageHandlerName else { return }
        onLoginRequested?()
    }
}