Babel没有内联源图

Question

我有index.js文件：

'use strict';

import prompt from 'prompt';

async function test() {
  let i = 0;

  await new Promise((resolve) => {
    setTimeout(() => {
      i++;
      resolve();
    }, 2000);
  });

  i++;
}

test().then(() => {
  console.log('done!');
});

我使用以下命令运行它：node --harmony-async-await -r babel-register --debug-brk=5858 /home/karl/dev/node/test/index.js

我有.babelrc文件：

{
  "presets": [
    "es2015"
  ]
}

当我运行调试器时，它会转换为以下内容：

(function (exports, require, module, __filename, __dirname) { 'use strict';

var _prompt = require('prompt');

var _prompt2 = _interopRequireDefault(_prompt);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

async function test() {
  var i = 0;

  await new Promise(function (resolve) {
    setTimeout(function () {
      i++;
      resolve();
    }, 2000);
  });

  i++;
}

test().then(function () {
  console.log('done!');
});
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});

我不知道为什么它没有为导入功能铺设源地图？