Cannot resolve module 'istanbul-instrumenter-loader'

gistfile1.js

var cwd = process.cwd(),
    path = require('path');

module.exports = function (config) {
  config.set({
    basePath: cwd,
    browsers: [
      'Chrome'
    ],
    files: [
      'test/spec/**/*'
    ],
    preprocessors: {
      'test/spec/**/*.js': ['webpack', 'sourcemap']
    },
    frameworks: [
      'jasmine'
    ],
    reporters: [
      'coverage',
      'junit',
      'progress'
    ],
    coverageReporter: {
      dir: 'report/karma-coverage',
      reporters: [{
        type: 'cobertura'
      }, {
        type: 'html'
      }, {
        type: 'text-summary'
      }]
    },
    junitReporter: {
      outputFile: 'report/karma-unit.xml'
    },
    webpack: {
      resolve: {
        extensions: ['', '.js'],
        modulesDirectories: [path.join(cwd, 'bower_components'), path.join(cwd, 'node_modules')]
      },
      devtool: 'inline-source-map',
      module: {
        postLoaders: [{
          test: /\.js$/,
          exclude: /(test|node_modules|bower_components)\//,
          loader: 'istanbul-instrumenter-loader'
        }]
      }
    },
    plugins: [
      'karma-chrome-launcher',
      'karma-coverage',
      'karma-jasmine',
      'karma-junit-reporter',
      'karma-sourcemap-loader',
      'karma-webpack',
      'istanbul-instrumenter-loader'
    ],
    logLevel: config.LOG_INFO
  });
};