title: index.ts is missing from the TypeScript compilation
body: <p>I got following error when running 'ng serve'. </p>
  
  <blockquote>
    <p>node_modules/angular2-indexeddb/index.ts is missing from the
    TypeScript compilation. Please make sure it is in your tsconfig via
    the 'files' or 'include' property. The missing file seems to be part
    of a third party library. TS files in published libraries are often a
    sign of a badly packaged library. Please open an issue in the library
    repository to alert its author and ask them to package the library
    using the Angular Package Format (<a href="https://docs.google.com/document/d/1CZC2rcpxffTDfRDs6p1cfbmKNLA6x5O-NtkJglDaBVs/preview" rel="nofollow noreferrer">https://docs.google.com/document/d/1CZC2rcpxffTDfRDs6p1cfbmKNLA6x5O-NtkJglDaBVs/preview</a>).</p>
  </blockquote>
  
  <p>I guess the issue is that angular2-indexeddb is not taken into compilation by tsconfig.
  <a href="https://github.com/gilf/angular2-indexeddb" rel="nofollow noreferrer">https://github.com/gilf/angular2-indexeddb</a></p>
  
  <p>I think there should be a temporary work around by editting the following configuration in tslint.json, but I need a solution to work through it. </p>
  
  <pre><code>  "include": [
      "**/*.spec.ts",
      "**/*.d.ts"
    ] 
  </code></pre>
  
  <p>Is it because angular2-indexeddb doesn't provide a good packaged library? In fact, I don't think a popular published library should have this issue. Or I missed something for configuration or compilation? Can I use package compilation tools/library to compile it into d.ts or spec.ts?</p>
  
  <h1>update:</h1>
  
  <p>In fact, I see *.d.ts file in the directory:</p>
  
  <pre><code>ls node_modules/angular2-indexeddb/
  LICENSE                                 angular2-indexeddb.metadata.json        index.js
  README.md                               angular2-indexeddb.min.js               index.js.map
  angular2-indexeddb.d.ts                 angular2-indexeddb.min.js.map           index.ts
  angular2-indexeddb.js                   angular2-indexeddb.ts                   package.json
  angular2-indexeddb.js.map               index.d.ts
  </code></pre>
  
  <p><strong>Content in tsconfig.json:</strong></p>
  
  <pre><code>{
    "compileOnSave": false,
    "compilerOptions": {
      "outDir": "./dist/out-tsc",
      "sourceMap": true,
      "declaration": false,
      "moduleResolution": "node",
      "emitDecoratorMetadata": true,
      "experimentalDecorators": true,
      "target": "es5",
      "typeRoots": [
        "node_modules/@types"
      ],
      "lib": [
        "es2017",
        "dom"
      ]
    }
  }
  </code></pre>