function __get__() {
    arguments.varName = arguments[0];
    if (arguments.varName && typeof arguments.varName === "string") {
        return eval(arguments.varName);
    } else {
        throw new TypeError("__get__ expects a non-empty string");
    }
}
This function will be stringified and then injected into every rewired module.
Then you can leak private variables by calling myModule.__get__("myPrivateVar");

All variables within this function are namespaced in the arguments array because every
var declaration could possibly clash with a variable in the module scope.

@param {!String} name name of the variable to retrieve
@throws {TypeError}
@return {*}