tsconfig.json

{
  "compilerOptions": {
    "allowSyntheticDefaultImports": true,
    "alwaysStrict": true,
    "experimentalDecorators": true,
    "forceConsistentCasingInFileNames": true,
    "lib": [
      "dom.iterable",
      "dom",
      "es2015.collection",
      "es2015.core",
      "es2015.generator",
      "es2015.iterable",
      "es2015.promise",
      "es2015.proxy",
      "es2015.reflect",
      "es2015.symbol.wellknown",
      "es2015.symbol",
      "es2015",
      "es2016.array.include",
      "es2016",
      "es2017.object",
      "es2017.sharedmemory",
      "es2017.string",
      "es2017.typedarrays",
      "es2017",
      "es2018",
      "es5",
      "es6",
      "es7",
      "esnext.array",
      "esnext.asynciterable",
      "esnext"
    ],
    "module": "esnext",
    "moduleResolution": "node",
    "noFallthroughCasesInSwitch": true,
    "noImplicitReturns": true,
    "noImplicitThis": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "pretty": true,
    "removeComments": true,
    "sourceMap": true,
    "strictFunctionTypes": true,
    "strictNullChecks": true,
    "target": "es5",
    "traceResolution": true,
    "typeRoots": ["node_modules/@types"],
    "baseUrl": "."
  }
}