less/tsconfig.json

{
  "compilerOptions": {
    "outDir": "./lib",
    "rootDir": "./src",
    "allowJs": true,
    "sourceMap": true,
    "inlineSources": true,
    "esModuleInterop": true,
    "importHelpers": true,
    "target": "ES5"
  },
  "include": ["src/**/*"],
  "exclude": ["node_modules"]
}