TypeScript:如何导入 ES6 JavaScript class?

TypeScript: How to import an ES6 JavaScript class?

我有一个 ES6 JavaScript class 命名的 DB 定义如下:

// db.js
"use strict";

export default class DB {
  ...
}

以及如下所示的 TypeScript 文件:

// surgeons.ts
"use strict";

import DB from "./db";

我希望这能正常工作,但我收到以下错误:

Browserify Error { [TypeScript error: app/source/common/surgeons.ts(3,16): Error TS2307: Cannot find module './db'.]
  message: 'app/source/common/surgeons.ts(3,16): Error TS2307: Cannot find module \'./db\'.',
  fileName: 'app/source/common/surgeons.ts',
  line: 3,
  column: 16,
  name: 'TypeScript error' }

我试图按照 here 的描述定义一个 db.d.ts 文件,但这产生了错误:

Browserify Error { [TypeScript error: app/source/common/surgeons.ts(5,16): Error TS2306: File 'app/source/common/db.d.ts' is not a module.]
  message: 'app/source/common/surgeons.ts(5,16): Error TS2306: File \'app/source/common/db.d.ts\' is not a module.',
  fileName: 'app/source/common/surgeons.ts',
  line: 5,
  column: 16,
  name: 'TypeScript error' }

我的tsconfig如下:

{
  "compilerOptions": {
    "module": "es6",
    "target": "es6",
    "moduleResolution": "node",
    "noImplicitAny": true,
    "removeComments": true,
    "preserveConstEnums": true,
    "allowSyntheticDefaultImports": true,
    "sourceMap": true
  },
  "include": [
    "app/source/**/*",
    "test/**/*"
  ],
  "exclude": [
    "node_modules"
  ]
}

根据 Daniel Rosenwasser 的说法,在 tsconfig.json "compilerOptions" 部分设置 "allowJs": true 就可以了。我根本不需要使用 .d.ts 文件。