tsconfig.json

{
  "compilerOptions": {
    "allowSyntheticDefaultImports": true,
    "allowUnreachableCode": false,
    "baseUrl": "./src",
    "declaration": true,
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "lib": ["dom", "esnext"],
    "module": "ESnext",
    "moduleResolution": "node",
    "noImplicitAny": true,
    "noImplicitReturns": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "outDir": "dist",
    "strict": true,
    "strictNullChecks": true,
    "target": "ESNext",
    "types": ["node", "jest"]
  },
  "ts-node": {
    // these options are overrides used only by ts-node
    // same as our --compilerOptions flag and our TS_NODE_COMPILER_OPTIONS environment variable
    "compilerOptions": {
      "module": "commonjs"
    }
  },
  "include": ["packages/**/*", "demo/**/*", "**/*.spec.ts"],
  "exclude": ["node_modules", "dist"]
}