tsconfig.json

{
  "compilerOptions": {
    "target": "es2017",
    "outDir": "build",
    "rootDir": "src",
    "module": "commonjs",
    "declaration": true,
    "stripInternal": true,

    "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */,

    "strict": true /* Enable all strict type-checking options. */,

    /* Additional Checks */
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noImplicitReturns": true /* Report error when not all code paths in function return a value. */,
    "noFallthroughCasesInSwitch": true /* Report errors for fallthrough cases in switch statement. */,

    /* Debugging Options */
    "pretty": true /* Stylize errors and messages using color and context. */,
    "resolveJsonModule": true,

    "lib": ["es2017", "esnext.asynciterable"]
  },
  "include": ["src/**/*"]
}