Karma Typescript helloworld示例失败

Uncaught ReferenceError: define is not defined

示例项目-我认为这是演示问题最简单的配置:

package.json:

{
  "name": "HelloWorld",
  "scripts": {
    "build": "tsc -p ts",
    "test": "./node_modules/karma/bin/karma start karma.conf.js"
  },
  "devDependencies": {
    "typescript": "~2.4.1"
    ,"jasmine-core": "2.6.4"
    ,"jasmine": "2.6.0"
    ,"@types/jasmine": "2.5.53"
    ,"karma": "1.7.0"
    ,"karma-chrome-launcher": "^2.2.0"
    ,"karma-jasmine": "^1.1.0"
  }
}

module.exports = function(config) {
  config.set({
    frameworks: ['jasmine'],
    files: ['js/*.spec.js'],
    reporters: ['progress'],
    port: 9876,
    colors: true,
    logLevel: config.LOG_INFO,
    autoWatch: true,
    browsers: ['Chrome'],
    singleRun: false,
    concurrency: Infinity
  })
}

{
  "compilerOptions": {
    "target": "es5"
    ,"module": "amd"
    ,"lib": [ "es2015", "dom" ]
    ,"outDir": "../js"
  }
}

ts/helloworld.ts

function returnHello() : string {
  return "Hello";
}

export default returnHello;

ts/helloworld.spec.ts

import returnHello from "helloworld";

describe("Some Test", function() {
  it("passes", () => expect(returnHello()).toEqual("Hello"));
});