How to use 'express res.sendfile' in JavaScript

86
function sendFile(filePath: string, response: http.ServerResponse,
87
                  alternatePath: string = "", isDynamic: boolean = false) {
88
  var extension = path.extname(filePath);
89
  var contentType = CONTENT_TYPES[extension.toLowerCase()] || 'application/octet-stream';
90
91
  getContent(filePath, function(error, content) {
92
    if (error) {
93
      logging.getLogger().error(error, 'Unable to send static file: %s', filePath);
94
95
      if (alternatePath != "") {
96
        sendDataLabFile(alternatePath, response);
97
      } else {
98
        response.writeHead(500);
99
        response.end();
100
      }
101
    }
102
    else {
103
      if (isDynamic) {
104
        response.removeHeader('Cache-Control');
105
        response.setHeader('Cache-Control', 'no-cache');
106
      }
107
      response.writeHead(200, { 'Content-Type': contentType });
108
      response.end(content);
109
    }
110
  }, isDynamic);
111
}