tsconfig.json

{
  "compilerOptions": {
    "target": "es2018",
    "rootDir": "src",
    "outDir": "dist",
    "module": "commonjs",
    "moduleResolution": "node",
    "esModuleInterop": true,
    "resolveJsonModule": true,
    "allowJs": true,
    "forceConsistentCasingInFileNames": true,
    "noImplicitReturns": true,
    "strict": false,
    "noUnusedLocals": true,
    "removeComments": true,
    "declaration": true,
    "sourceMap": true,
    "inlineSources": true,
    "typeRoots": [
      "./types.ts",
      "./node_modules/@types",
      "@types/jest"
    ],
    "types": ["jest"],
    "stripInternal": true,
    "noImplicitAny": false,
    "preserveConstEnums": true,
    "experimentalDecorators": true,                   /* Enable experimental support for TC39 stage 2 draft decorators. */
    "emitDecoratorMetadata": true,                    /* Emit design-type metadata for decorated declarations in source files. */
  },
  "include": [
    "src/**/*"
  ]
}