tsconfig.json

{
    "include": [
      "src/**/*"
    ],
    "exclude": [
      "node_modules",
      "tests",
      "data",
      "dist",
      "dist.esm"
    ],
    "compilerOptions": {
      "target": "es2015",
      "module": "es2015",
      "lib": [
        "es2017",
        "es7",
        "es6",
        "dom"
      ],
      "moduleResolution": "node",
      "allowSyntheticDefaultImports": true,
      "esModuleInterop": true,
      "emitDeclarationOnly": false,
      "sourceMap": true,
      "strict": false,
      "skipLibCheck": true,
      "noImplicitAny": false,
      "strictNullChecks": false,
      "emitDecoratorMetadata": true,
      "removeComments": false,
      "isolatedModules": false,
      "preserveConstEnums": true,
      "experimentalDecorators": true,
      "resolveJsonModule": true,
      "rootDirs": [
        "src/"
      ],
      "typeRoots": [
        "node_modules/@types"
      ]
    }
}