tsconfig.json

{
  "compilerOptions": {
      "incremental": true,
      "target": "ESNEXT",
      "module": "commonjs",
      "declaration": true,
      "declarationMap": true,
      "sourceMap": true,
      "outDir": "build",
      "rootDir": "./src",
      "strict": true,
      "noImplicitAny": true,
      "strictNullChecks": true,
      "strictFunctionTypes": true,
      "strictBindCallApply": true,
      "strictPropertyInitialization": true,
      "noImplicitThis": true,
      "alwaysStrict": true,
      "noUnusedLocals": false,
      "noUnusedParameters": false,
      "noImplicitReturns": true,
      "noFallthroughCasesInSwitch": true,
      "allowSyntheticDefaultImports": true,
      "esModuleInterop": true,
      "experimentalDecorators": true,
      "emitDecoratorMetadata": true,
      "baseUrl": "./",
      "resolveJsonModule": true,
      "moduleResolution": "node"
  },
  "include": [
      "./src/**/*",
      "./declarations/**/*"
  ],
  "exclude": [
      "node_modules",
      "build",
      "__tests__"
  ]
}