message: perf(@vant/popperjs): add sideEffects false flag
diff: {
  "name": "@vant/popperjs",
  "version": "1.1.0",
  - "description": "Precompiled popperjs core",
  + "description": "Pre-compiled popperjs core",
  "main": "dist/cjs/index.js",
  "module": "dist/esm/index.js",
  "types": "dist/index.d.ts",
  + "sideEffects": false,
  "files": [
  "dist"
  ],
  