tsconfig.json

{
  "compilerOptions": {
    "paths": { "*": ["types/*"] },
    "module": "commonjs",
    "target": "ES6",
    "typeRoots": [
      "./types",
      "../../node_modules/@types/"
    ],
    "lib": [
      "es5",
      "es2015.promise",
      "es6",
      "es7",
      "es2017",
      "dom"
    ],
    "baseUrl": ".",
    "outDir": "lib/cjs",
    "allowJs": false,
    "moduleResolution": "node",
    "forceConsistentCasingInFileNames": true,
    "noImplicitReturns": true,
    "noImplicitThis": true,
    "noImplicitAny": true,
    "strictNullChecks": true,
    "suppressImplicitAnyIndexErrors": true,
    "noUnusedLocals": true,
    "declaration": true,
    "allowSyntheticDefaultImports": true,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "skipLibCheck": true,
    "esModuleInterop": true,
    "strict": true,
    "resolveJsonModule": true,
    "isolatedModules": false,
    "sourceMap": true
  },
}