tsconfig.client.json

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "moduleResolution": "node",
    "strict": true,
    "noImplicitReturns": true,
    "forceConsistentCasingInFileNames": true,
    "outDir": "out",
    "declaration": true,
    "importHelpers": true
  },
  "include": [
    "./src/client",
    "./src/common",
    "./src/index.ts"
  ]
}