cachebuster-gruntfile.js

//using https://www.npmjs.com/package/grunt-cachebuster
module.exports = function(grunt) {	
  grunt.initConfig({
      cachebuster: {
        //appears you need a sub-task
        'generate-hashes': {
          options: {
            //basedir: 'src/EHRSim.Web'
            //basedir replacement does NOT work on windows, need to handle replacement on your own
            formatter: function(hashes) {
              var output = '{';

              for(var filename in hashes){
                output += '"' + filename.replace('src/EHRSim.Web', '') + '": "' + hashes[filename] + '",';
              }

              output = output.replace(/(,$)/g, '');

              output += '}';
              return output;
            }
          },
          files: { 
            'fileHashes.json': [
              'src/EHRSim.Web/_static/s/**/*',
              'src/EHRSim.Web/_static/c/**/*.css',
              'src/EHRSim.Web/_static/i/**/*',
              'src/EHRSim.Web/_static/f/**/*'
            ] 
          }
        }
      }
    });

  grunt.loadNpmTasks('grunt-cachebuster');

  grunt.registerTask('default', ['foo', 'bar', 'cachebuster']);
};