tsconfig.json

{
  "compilerOptions": {
    "allowJs": false,
    "preserveConstEnums": true,
    "declaration": true,
    "declarationMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "importHelpers": true,
    "sourceMap": true,
    "module": "commonjs",
    "moduleResolution": "node",
    "noImplicitReturns": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "outDir": "lib",
    "skipLibCheck": true,
    "strict": true,
    "suppressExcessPropertyErrors": true,
    "suppressImplicitAnyIndexErrors": true,
    "downlevelIteration": true,
    "target": "es5",
    "jsx": "react",
    "lib": [
      "dom",
      "dom.iterable",
      "es5",
      "es2015",
      "es2016",
      "es2017"
    ]
  }
}