cobalt/demos/content/media-element-demo/tsconfig.json

{
  "compilerOptions": {
    "outDir": "./dist/",
    "sourceMap": true,
    "noImplicitAny": true,
    "module": "es6",
    "target": "es5",
    "allowJs": true,
    "strict": true,
    "lib": [
      "esnext",
      "dom"
    ],
  }
}