fileCreateInfo = new SP.FileCreationInformation();
            fileCreateInfo.set_overwrite(true);
            fileCreateInfo.set_url(filename);
            fileCreateInfo.set_content(content); /*the content is generated somewhere else, it's not important in this question*/

            this.newFile = oList.get_rootFolder().get_files().add(fileCreateInfo);

            clientContext.load(this.newFile);