tsconfig.json

{
    "compilerOptions": {
      "module": "esnext",
      "outDir": "lib",
      "rootDir": "src",
      "baseUrl": ".",
      "target": "es5",
      "lib": [
        "dom",
        "es2015",
        "es2016",
        "es2017",
        "esnext"
      ],
      "sourceMap": true,
      "jsx": "react",
      "strict": true,
      "composite": true,
      "declaration": true,
      "declarationMap": true,
      "moduleResolution": "node",
      "allowSyntheticDefaultImports": true,
      "esModuleInterop": true,
      "forceConsistentCasingInFileNames": true,
      "downlevelIteration": true,
      "noImplicitReturns": true,
      "noImplicitThis": true,
      "noImplicitAny": true,
      "preserveSymlinks": true,
      "importHelpers": true,
      "strictNullChecks": true,
      "suppressImplicitAnyIndexErrors": true,
      "noUnusedLocals": true,
      "resolveJsonModule": true
    },
    "include": ["./src/**/*"]
  }