语法错误：意外令牌'>'

Question

运行Karma + WebPack +茉莉花。

karma.conf.js

var webpackConfig = require('./webpack.test');

module.exports = function (config) {
  var _config = {
    basePath: '../src',

    frameworks: ['jasmine', 'stacktrace', 'es6-shim'],

    files: [
      { pattern: "../config/base.spec.ts" },
    ],

    preprocessors: {
      '../config/base.spec.ts': ['webpack', 'sourcemap']
    },

    webpack: webpackConfig,

    webpackMiddleware: {
      logLevel: 'error'
    },

    webpackServer: {
      noInfo: true
    },

    coverageReporter: {
      type: 'in-memory'
    },

    remapCoverageReporter: {
      'text-summary': null,
      json: './.coverage/coverage.json',
      html: './.coverage/html'
    },

    htmlDetailed: {
      splitResults: false,
      useHostedBootstrap: true,
      dir: '../.reports',
      refreshTimeout: 30000
    },

    reporters: ['progress', 'coverage', 'remap-coverage', 'htmlDetailed'],
    port: 9876,
    colors: true,
    logLevel: config.LOG_INFO,
    autoWatch: true,
    browsers: ['PhantomJS'],
    singleRun: false
  };

  config.set(_config);
};

base.spec.ts

import "core-js";
import "es6-shim";
import "zone.js/dist/zone";
import "zone.js/dist/long-stack-trace-zone";
import "zone.js/dist/proxy";
import "zone.js/dist/sync-test";
import "zone.js/dist/jasmine-patch";
import "zone.js/dist/async-test";
import "zone.js/dist/fake-async-test";

import { TestBed } from "@angular/core/testing";
import { BrowserDynamicTestingModule, platformBrowserDynamicTesting } from "@angular/platform-browser-dynamic/testing";

// Hide stack traces
Error.stackTraceLimit = 0;
// Show stack traces
//Error.stackTraceLimit = Infinity;

TestBed.initTestEnvironment(BrowserDynamicTestingModule, platformBrowserDynamicTesting());


const context = require.context("../src", true, /\.spec\.ts$/);
context.keys().forEach(context);

我的TypeScript代码编译得很好。但是，当我使用import * as sinon from 'sinon';在规范文件中引用sinon时，出现以下错误：

SyntaxError: Unexpected token '>'
  at webpack:///node_modules/sinon/pkg/sinon-esm.js:21406 <- /Users/...

该行包含该文件中的第一个lambda函数。

看来，Karma + WebPack并未将代码转换为ES5，而Phantom也不喜欢lambda函数。如您所见，我正在es6-shim中加载base.spec.js，在业力配置中加载karma-es6-shim。

我该如何解决？