vant/packages/vant-area-data/tsconfig.json

{
  "compilerOptions": {
    "target": "ES2019",
    "outDir": "./lib",
    "module": "ES2015",
    "strict": true,
    "declaration": true,
    "skipLibCheck": true,
    "esModuleInterop": true,
    "lib": ["esnext"]
  },
  "include": ["src/**/*"]
}