Gruntjs with grunt-nodemon, watch and jshint

Question

I'm trying to run GruntJS with those 3 plugins so it can watch for changes and first: lint the file and then reload express server. My problem with the config below is that if jshint lint the file, nodemon doesn't run and vice versa.

// Gruntfile.js

// our wrapper function (required by grunt and its plugins)
// all configuration goes inside this function
module.exports = function(grunt) {

  // ===========================================================================
  // CONFIGURE GRUNT ===========================================================
  // ===========================================================================
  grunt.initConfig({

    // get the configuration info from package.json ----------------------------
    // this way we can use things like name and version (pkg.name)
    pkg: grunt.file.readJSON('package.json'),

    // all of our configuration will go here

    // configure jshint to validate js files -----------------------------------
  jshint: {
      options: {
        reporter: require('jshint-stylish') // use jshint-stylish to make our errors look and read good
      },

    // when this task is run, lint the Gruntfile and all js files in src
      build: ['Grunfile.js', 'routes/*.js']
    },

    watch: {

      // for scripts, run jshint and uglify
      scripts: {
        files: 'routes/*.js',
        tasks: ['jshint']
      }
    },

    concurrent: {
      dev: {

        tasks: ['jshint', 'nodemon', 'watch'],
        options: {
          logConcurrentOutput: true
        }
      }
    }, // concurrent

    nodemon: {
      dev: {
        script: './server.js'
      }
    } // nodemon


  });

  // ===========================================================================
  // LOAD GRUNT PLUGINS ========================================================
  // ===========================================================================
  // we can only load these if they are in our package.json
  // make sure you have run npm install so our app can find these
  grunt.loadNpmTasks('grunt-contrib-jshint');
  grunt.loadNpmTasks('grunt-contrib-watch');
  grunt.loadNpmTasks('grunt-nodemon');


      grunt.registerTask('default', '', function() {
    var taskList = [
        'jshint',
        'nodemon',
        'watch'
    ];
    grunt.task.run(taskList);
});

};

EDIT (clarification):

The first time that I ran grunt, jshint lint the files, then nodemon start and jshint doesn't lint anymore.

Output:

grunt
Running "default" task

Running "jshint:build" (jshint) task

✔︎ No problems


Running "nodemon:dev" (nodemon) task
[nodemon] v1.2.1
[nodemon] to restart at any time, enter `rs`
[nodemon] watching: *.*
[nodemon] starting `node ./server.js`
Express server listening on port 3000

Answer 1

Try running it as a function task:

grunt.registerTask('default', '', function() {
    var taskList = [
        'jshint',
        'nodemon',
        'watch'
    ];
    grunt.task.run(taskList);
});

EDIT: Another method I've used to achieve the goal of auto rerunning tasks including express, using grunt-express-server, applied to your setup:

module.exports = function(grunt) {
    grunt.initConfig({
        pkg: grunt.file.readJSON("package.json"),
        watch: {
            express: {
                files: ['routes/*.js'],
                tasks: ['jshint', 'express:dev'],
                options: {
                    spawn: false
                }
            }
        },
        express: {
            dev: {
                options: {
                    script: 'app.js',
                }
            }
        },
        jshint: {
            options: {
                node: true
            },
            all: {
                src: ['routes/*.js']
            }
        }
    });

    grunt.loadNpmTasks('grunt-express-server');
    grunt.loadNpmTasks('grunt-contrib-jshint');

    grunt.registerTask('default', '', function() {
        var taskList = [
            'jshint',
            'express:dev',
            'watch'
        ];
        grunt.task.run(taskList);
    });
};