tsconfig.json

{
  "compilerOptions": {
    "allowJs": true,
    "allowSyntheticDefaultImports": true,
    "types": ["react", "jest", "webpack-env"],
    "baseUrl": "./src",
    "declaration": false,
    "emitDecoratorMetadata": true,
    "esModuleInterop": true,
    "experimentalDecorators": true,
    "forceConsistentCasingInFileNames": true,
    "incremental": true,
    "jsx": "react-jsx",
    "lib": ["ESNext", "DOM", "ES5", "DOM.Iterable"],
    "module": "commonjs",
    "moduleResolution": "node",
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "outDir": "./dist",
    "pretty": true,
    "removeComments": true,
    "resolveJsonModule": true,
    "skipLibCheck": true,
    "sourceMap": true,
    "strict": true,
    "target": "es5",
    "downlevelIteration": true
  },
  "include": ["src/**/*.ts", "src/**/*.tsx", "custom.d.ts"],
  "exclude": ["node_modules", "build", "src/*.json"]
}