@keplr-ewallet/ewallet-sdk-core/dist/window_msg/send_msg_to_iframe.js

export const EWALLET_ATTACHED_TARGET = "keplr_ewallet_attached";
export function sendMsgToIframe(msg) {
    return new Promise((resolve, reject) => {
        if (this.iframe.contentWindow === null) {
            reject("iframe contentWindow is null");
            return;
        }
        const contentWindow = this.iframe.contentWindow;
        const channel = new MessageChannel();
        channel.port1.onmessage = (obj) => {
            const data = obj.data;
            console.debug("[keplr] reply recv", data);
            if (data.hasOwnProperty("payload")) {
                resolve(data);
            }
            else {
                console.error("[keplr] unknown msg type");
                resolve({
                    target: "keplr_ewallet_sdk",
                    msg_type: "unknown_msg_type",
                    payload: JSON.stringify(data),
                });
            }
        };
        contentWindow.postMessage(msg, this.sdkEndpoint, [channel.port2]);
    });
}
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