tsconfig.json

{
  "compilerOptions": {
    "allowJs": true,
    "esModuleInterop": true,
    "module": "commonjs",
    "lib": ["DOM", "ES2017"],
    "noImplicitAny": true,
    "sourceMap": true,
    "strict": true,
    "target": "es2017",
    "types": ["mocha", "node"],
  },
}