Angular和RxJs - 为什么整个RxJs lib被webpack / CLI引入bundle

Question

我正在使用RxJs开发一个Angular应用程序。

我一直小心避免使用

import 'rxjs'

我只是做

等导入

import 'rxjs/add/operator/map';

不幸的是，当我通过

创建分发包时

ng build --prod

我通过 webpack-bundle-analyzer 看到整个 RxJs 库已导入最终捆绑包中。 这有什么明显的原因吗？ 一般来说，是否可以通过查看 stats.json 来了解哪个模块负责导入另一个模块？

这是我的package.json，如果可以提供帮助

{
  "name": "client",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e",
    "bundle-report": "webpack-bundle-analyzer dist/stats.json"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^4.4.3",
    "@angular/cdk": "^2.0.0-beta.11",
    "@angular/common": "^4.0.0",
    "@angular/compiler": "^4.0.0",
    "@angular/core": "^4.0.0",
    "@angular/flex-layout": "^2.0.0-beta.9",
    "@angular/forms": "^4.0.0",
    "@angular/http": "^4.0.0",
    "@angular/material": "^2.0.0-beta.11",
    "@angular/platform-browser": "^4.0.0",
    "@angular/platform-browser-dynamic": "^4.0.0",
    "@angular/router": "^4.0.0",
    "core-js": "^2.4.1",
    "hammerjs": "^2.0.8",
    "rxjs": "^5.4.1",
    "web-animations-js": "^2.3.1",
    "zone.js": "^0.8.14"
  },
  "devDependencies": {
    "@angular/cli": "1.2.4",
    "@angular/compiler-cli": "^4.0.0",
    "@angular/language-service": "^4.0.0",
    "@types/jasmine": "~2.5.53",
    "@types/jasminewd2": "~2.0.2",
    "@types/node": "~6.0.60",
    "codelyzer": "~3.0.1",
    "jasmine-core": "~2.6.2",
    "jasmine-spec-reporter": "~4.1.0",
    "karma": "~1.7.0",
    "karma-chrome-launcher": "~2.1.1",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^1.2.1",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.1.2",
    "ts-node": "~3.0.4",
    "tslint": "~5.3.2",
    "typescript": "~2.3.3",
    "webpack-bundle-analyzer": "^2.9.0"
  }
}