grpc-node/packages/grpc-js/tsconfig.json

{
  "extends": "./node_modules/gts/tsconfig-google.json",
  "compilerOptions": {
    "lib": ["es2017"],
    "outDir": "build",
    "target": "es2017",
    "module": "commonjs",
    "resolveJsonModule": true,
    "incremental": true,
    "types": ["mocha"]
  },
  "include": [
    "src/**/*.ts",
    "test/**/*.ts"
  ]
}