tsconfig.json

{
  "exclude": ["node_modules", "dist"],
  "include": ["**/*.ts", "**/*.js"],
  "compilerOptions": {
    "target": "esnext",
    "module": "commonjs",
    "lib": ["esnext", "esnext.asynciterable", "dom"],
    "declaration": true,
    "outDir": "dist",
    "strict": true,
    "esModuleInterop": true,
    "moduleResolution": "node",
    "sourceMap": true,
    "strictNullChecks": true,
    "typeRoots": ["types", "node_modules/@types"],
    "types": ["@types/node"],
    "allowSyntheticDefaultImports": true /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */,
    "noImplicitReturns": true /* Report error when not all code paths in function return a value. */,
    "noFallthroughCasesInSwitch": true /* Report errors for fallthrough cases in switch statement. */,
    "experimentalDecorators": true /* Enables experimental support for ES7 decorators. */
  }
}