tsconfig.json

{
  "compilerOptions": {
    "baseUrl": "src",
    "target": "esnext",
    "jsx": "react",
    "lib": [
      "es5",
      "es6",
      "esnext",
      "DOM",
      "DOM.Iterable",
      "WebWorker"
    ],
    "resolveJsonModule": true,
    "moduleResolution": "node",
    "experimentalDecorators": true,
    "allowJs": true,
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "skipLibCheck": true,
    "strictPropertyInitialization": false,
    // strict flag sets to true next flags:
    // - alwaysStrict
    // - noImplicitAny
    // - strictNullChecks
    // - strictFunctionTypes,
    // - strictPropertyInitialization
    // - noImplicitThis
    // - strictBindCallApply
    "strict": true,
    "incremental": true,
    // TODO: remove useUnknownInCatchVariables from config
    "useUnknownInCatchVariables": false
  },
  "include": [
    "src/",
    "test/"
  ],
  "exclude": [
    "src/**/*.js"
  ]
}