tsconfig.json

{
  "compilerOptions": {
      "alwaysStrict": true,
      "allowSyntheticDefaultImports": true,
      "allowUnreachableCode": false,
      "declaration": true,
      "experimentalDecorators": true,
      "forceConsistentCasingInFileNames": true,
      "jsx": "react",
      "jsxFactory": "h",
      "jsxFragmentFactory": "Fragment",
      "lib": ["dom", "es2018", "esnext.array"],
      "module": "esnext",
      "moduleResolution": "node",
      "noImplicitAny": false,
      "noImplicitOverride": true,
      "emitDecoratorMetadata": true,
      "noImplicitReturns": true,
      "noUnusedLocals": true,
      "noUnusedParameters": false,
      "outDir": "build",
      "pretty": true,
      "resolveJsonModule": true,
      "sourceMap": true,
      "target": "ES6",
      "useUnknownInCatchVariables": true,
      "baseUrl": "."
  },
  "exclude": ["**/dist/**"]
}