tsconfig.json

{
  "compilerOptions": {
    "baseUrl": ".",
    "outDir": "./build/ts",     // path to output directory
    "sourceMap": true,          // allow sourcemap support
    "strictNullChecks": true,   // enable strict null checks as a best practice
    "module": "es6",            // specify module code generation
    "jsx": "react",             // use typescript to transpile jsx to js
    "target": "es5",            // specify ECMAScript target version
    "moduleResolution": "node",
    "allowSyntheticDefaultImports": true,
    "noImplicitReturns": false,
    "noImplicitAny": true,
    "noImplicitThis": false,
    "noUnusedParameters": true,
    "noUnusedLocals": true,
    "resolveJsonModule": true,
    "typeRoots": [
      "node_modules/musickit-typescript",
      "node_modules/@types",
      "src/app/types"
    ],
    "lib": [
      "es2015",
      "es6",
      "dom",
      "es2017.object"
    ]
  },
  "include": [
    "./src/app/**/*"
  ]
}