@vue/cli-service/types/tsconfig.json

{
  "files": [
    "cli-service-test.ts",
    "index.d.ts",
    "ProjectOptions.d.ts"
  ],
  "compilerOptions": {
    "module": "commonjs",
    "lib": [
      "es6"
    ],
    "noImplicitAny": true,
    "noImplicitThis": true,
    "strictNullChecks": true,
    "esModuleInterop": true,
    "strictFunctionTypes": true,
    "types": [],
    "noEmit": true,
    "forceConsistentCasingInFileNames": true,
    "baseUrl": "."
  }
}