title: Visual Studio Code: "'tslib' cannot be found" error in Angular project
body: <p>Basically, all I'm doing is starting a new Angular project and loading it into a workspace. It doesn't look as if VS Code can do any linting or code sense because of this error. It's spitting up this error data:</p>
  
  <pre><code>{
      "resource": "/Users/&lt;snip!&gt;/angular-project/src/app/app.module.ts",
      "owner": "typescript",
      "code": "2354",
      "severity": 8,
      "message": "This syntax requires an imported helper but module 'tslib' cannot be found.",
      "source": "ts",
      "startLineNumber": 13,
      "startColumn": 1,
      "endLineNumber": 26,
      "endColumn": 3
  }
  </code></pre>
  
  <p>I found an old bug somewhere that said <code>moduleResolution</code> of <code>tsconfig.json</code> had to be set to <code>node</code>, but Angular CLI has already done that for me...</p>
  
  <pre><code>{
    "compileOnSave": false,
    "compilerOptions": {
      "baseUrl": "./",
      "outDir": "./dist/out-tsc",
      "sourceMap": true,
      "declaration": false,
      "module": "esnext",
      "moduleResolution": "node",
      "emitDecoratorMetadata": true,
      "experimentalDecorators": true,
      "importHelpers": true,
      "target": "es2015",
      "typeRoots": [
        "node_modules/@types"
      ],
      "lib": [
        "es2018",
        "dom"
      ]
    }
  }
  </code></pre>
  
  <p>Edit: Steps I took to get here (using version 8 as of this writing):</p>
  
  <ol>
  <li>Install Angular CLI: <code>$ npm install -g @angular/cli</code> </li>
  <li>Create the project: <code>$ ng new angular-project</code> </li>
  <li>Serve the project: <code>$ ng serve</code></li>
  </ol>
  
  <p>Does anyone know how to solve this?</p>