tsconfig.json

{
  "compilerOptions": {
    /* Basic Options */
    "target": "es5",
    "module": "ESNext",
    "declaration": true,
    "sourceMap": true,
    "removeComments": false,
    "noLib": false,
    "skipLibCheck": true,
    "jsx": "react",
    "types": ["node", "jest"],
    "lib": ["dom", "es2015", "es2016", "es2017", "esnext.asynciterable"],
    "keyofStringsOnly": true,

    /* Strict Type-Checking Options */
    "strict": true,

    /* Additional Checks */
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,

    /* Experimental Options */
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,

    /* Module Resolution Options */
    "esModuleInterop": true,
    "baseUrl": "./",
    "outDir": "dist"
  },
  "include": ["./src/**/*"]
}