tsconfig.json

{
  "compilerOptions": {
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,
    "target": "es5",
    "downlevelIteration": true,
    "importHelpers": true,
    "sourceMap": true,
    "module": "esnext",
    "moduleResolution": "node",
    "jsx": "react-jsx",
    "resolveJsonModule": true,
    "allowJs": false,
    "checkJs": false,
    "lib": ["dom", "es2015", "es2016", "es2017", "esnext"],
    "forceConsistentCasingInFileNames": true,
    "experimentalDecorators": true,
    "noImplicitAny": false,
    "noUnusedParameters": false,
    "noImplicitReturns": true,
    "noImplicitThis": true,
    "noUnusedLocals": false,
    "skipLibCheck": true,
    "strictNullChecks": true,
    "suppressImplicitAnyIndexErrors": true,
    "types": ["jest", "node"],
    "baseUrl": ".",
    "strict": true,
    "isolatedModules": true,
    "noEmit": true,
    "noFallthroughCasesInSwitch": true
  },
  "exclude": ["./node_modules/"],
  "include": ["src"]
}