Windows 10 11082 WEBPAGE.JS

(function (nativeMsBrowser) {
    nativeJSON = window.JSON;
    Object.defineProperty(window, "msBrowser", {
        get: delayInitMsBrowser,
        configurable: true,
        enumerable: true
    });

    function delayInitMsBrowser() {
        var wrapMsBrowser = Object.defineProperties({}, {
            "runtime": {
                get: delayInitRuntime,
                configurable: true,
                enumerable: true
            }
        });

        // Replace delayInit with the initialized object to avoid repeated calls to delayInit.
        Object.defineProperty(window, "msBrowser", {
            value: wrapMsBrowser,
            configurable: true,
            enumerable: true
        });

        return wrapMsBrowser;
    }

    function delayInitRuntime() {
        var wrapRuntime = {};

        Object.defineProperties(wrapRuntime, {
            "sendMessage": {
                value: sendMessageIndirect.bind(nativeMsBrowser.runtime),
                configurable: true,
                enumerable: true
            }
        });

        function sendMessageIndirect(/* optional string extensionId, any message, optional object options, optional function responseCallback */) {

            if (arguments.length < 1) {
                return null;
            }

            var index = arguments.length - 1;

            var responseCallback = null;
            if (typeof arguments[index] === "function") {
                responseCallback = responseCallbackIndirect(arguments[index]);
                --index;
            }

            var options = null;
            if (index >= 2) {
                // More than two arguments remain so options param must  present.
                options = arguments[index];
                --index;
            }
            else if (index === 2) {
                // The logic: assume that the first param is the optional extension id if it is present and is a string, hence no options argument in this case.
                if (!(arguments[0] === null || typeof arguments[0] === "string")) {
                    options = arguments[index];
                    --index;
                }
            }

            var message = arguments[index]; // Must be present.
            --index;

            var extensionId = null;
            if (index >= 0) {
                extensionId = arguments[index];
                --index;
            }

            if (index !== -1) {
                // Requires exact number of arguments, no extra arguments allowed.
                return null;
            }
            else {
                // Always stringify on sendMessage side and always parse on the callback side.
                // Otherwise, callback cannot distinuish between a message sending an object and another message sending its string equivalent.
                return nativeMsBrowser.runtime.sendMessage(extensionId, nativeJSON.stringify(message), options, responseCallback);
            }
        };

        // Replace delayInit with the initialized object to avoid repeated calls to delayInit.
        Object.defineProperty(window.msBrowser, "runtime", {
            value: wrapRuntime,
            configurable: true,
            enumerable: true
        });
        return wrapRuntime;
    }
})(window.msBrowser);

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