tsconfig.json

{
  "compilerOptions": {
    "baseUrl": ".",
    "outDir": "build",
    "module": "esnext",
    "target": "es5",
    "lib": ["es6", "dom", "es2015", "es2016", "es2017"],
    "allowJs": false,
    "allowSyntheticDefaultImports": true,
    "jsx": "react",
    "declaration": true,
    "moduleResolution": "node",
    "forceConsistentCasingInFileNames": true,
    "noImplicitReturns": true,
    "noImplicitThis": false,
    "noImplicitAny": true,
    "resolveJsonModule": true,
    "strictNullChecks": true,
    "suppressImplicitAnyIndexErrors": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "types": [
      "jest"
    ],
  },
  "include": [
    "./src/**/*.ts",
    "./src/**/*.tsx"
  ],
  "exclude": ["build", "rollup.config.js", "node_modules"]
}