title: There is debug.log file created in my angular-cli project. How is it created and what's its use?
body: <p>This is debug.log file:</p>
  
  <blockquote>
    <p>[0110/160818:ERROR:tcp_listen_socket.cc(76)] Could not bind socket to
    127.0.0.1:6004 [0110/160818:ERROR:node_debugger.cc(86)] Cannot start debugger server [0111/233417:ERROR:tcp_listen_socket.cc(76)] Could not
    bind socket to 127.0.0.1:6004 [0111/233417:ERROR:node_debugger.cc(86)]
    Cannot start debugger server
    [0113/120522:ERROR:tcp_listen_socket.cc(76)] Could not bind socket to
    127.0.0.1:6004 [0113/120522:ERROR:node_debugger.cc(86)] Cannot start debugger server [0113/122245:ERROR:tcp_listen_socket.cc(76)] Could not
    bind socket to 127.0.0.1:6004 [0113/122245:ERROR:node_debugger.cc(86)]
    Cannot start debugger server
    [0120/171545:ERROR:tcp_listen_socket.cc(76)] Could not bind socket to
    127.0.0.1:6004 [0120/171545:ERROR:node_debugger.cc(86)] Cannot start debugger server [0207/173408:ERROR:tcp_listen_socket.cc(76)] Could not
    bind socket to 127.0.0.1:6004 [0207/173408:ERROR:node_debugger.cc(86)]
    Cannot start debugger server</p>
  </blockquote>