Gruntfile.js

const sass = require('sass');

module.exports = function(grunt) {

  grunt.initConfig({
    pkg: grunt.file.readJSON('package.json'),

    // imagemin: {
      // media: {
      //   files: [{
      //     expand: true,
      //     cwd: 'media/images/',
      //     src: '{,*/}*.{png,jpg,jpeg,gif}',
      //     dest: 'media/images'
      //   }]
      // },
    //   static: {
    //     files: [{
    //       expand: true,
    //       cwd: 'publichealth/static/images',
    //       src: '{,*/}*.{png,jpg,jpeg,gif}',
    //       dest: 'publichealth/static/images'
    //     }]
    //   }
    // },

    watch: {
      sass: {
        files: "publichealth/static/**/*.scss",
        tasks: ['sass:dev']
      }
    },

    sass: {                              // Task
      dev: {                            // Target
        options: {                       // Target options
          implementation: sass,
          sourcemap: false
        },
        files: {                         // Dictionary of files
          "./assets/css/main.css": "publichealth/static/css/main.scss"
        }
      },
      dist: {
        options: {
          outputStyle: 'compressed',
          implementation: sass,
          sourcemap: true
        },
        files: {
          "./assets/css/main.min.css": "publichealth/static/css/main.scss"
        }
      }
    },

    bgShell: {
      _defaults: {
        bg: true,
        stdout: false,
        stderr: false,
      },
      runDjango: {
        cmd: 'python manage.py runserver'
      },
    },

    browserSync: {
      dev: {
        bsFiles: {
          src: [
            "./assets/css/*.css",
            "./*.html"
          ]
        },
        options: {
          watchTask: true,
          proxy:  "localhost:8000"
        }
      }
    }
  });

  // grunt.loadNpmTasks('grunt-contrib-imagemin');
  grunt.loadNpmTasks('grunt-contrib-watch');
  grunt.loadNpmTasks('grunt-bg-shell');
  grunt.loadNpmTasks('grunt-browser-sync');
  grunt.loadNpmTasks('grunt-sass');
  grunt.registerTask('default', ['sass']); // 'imagemin',
  grunt.registerTask('browser-sync', [
    'bgShell',
    'browserSync',
    'watch'
  ]);
};