tsconfig.json

{
  "compilerOptions": {
    "incremental": true,
    "tsBuildInfoFile": "dist/.tsbuildinfo",

    /* Language and Environment */
    "target": "es2016",
    "lib": ["es2016", "DOM"],
    "jsx": "preserve",
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "moduleDetection": "auto",

    /* Modules */
    "module": "commonjs",
    "resolveJsonModule": true,

    /* JavaScript Support */
    "allowJs": true,
    "checkJs": true,

    /* Emit */
    "declaration": true,
    "declarationMap": true,
    "sourceMap": true,
    "outDir": "dist",
    "removeComments": true,

    /* Interop Constraints */
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,

    /* Type Checking */
    "strict": true,
    "noImplicitAny": true,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "noImplicitThis": true,
    "useUnknownInCatchVariables": true,
    "alwaysStrict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noImplicitReturns": true,
    "allowUnusedLabels": false,
    "allowUnreachableCode": false,

    "skipLibCheck": true
  },
  "include": ["./src"],
  "exclude": ["./src/**/__tests__"]
}