After ES6 is compiled into Es5, why is the code so huge?

DWQA Questions › Category: Program › After ES6 is compiled into Es5, why is the code so huge?

colinapks asked 3 hours ago

class Foo {
  constructor(...args) {
    this.args = args;
  }
  * [Symbol.iterator]() {
    for (let arg of this.args) {
      yield arg;
    }
  }
}

for (let x of new Foo('hello', 'world')) {
  console.log(x);
}

I compiled the above section of ES6 code with Babel loader in webpack, and the compiled file has more than 20000 lines! It really surprised me. Is there something wrong with my configuration? I dare not use ES6. I hope you can help me answer it. Thank you!
图片描述
The screenshot of the webpack configuration file is as follows:
,React hot is probably because of this thing. Hotmodulereplacementplugin will also add a lot of code to the bundle,1.Iterators + For..OfBabel Polyfill must be introduced. It’s on this official document
2.entryThe first two in are used in development, and the production environment should be removed.
3. The final generated file includes the CSS code. You need to evaluate how big it is (you can take a look at the extracted CSS code)extract-text-webpack-plugin)
4. Webpack itself will add some code to support modularization
5. From your screenshot,reactThe code is packaged,reactRelatively large.

Question Tags: es6, webpack

joyqi replied 3 hours ago

I’ll delete it if I don’t add any more

joyqi replied 3 hours ago

Please use the comment function

joyqi replied 3 hours ago

Questions should be put in comments, not in answers.

joyqi replied 3 hours ago

@fenYes, it is executed at the terminal

joyqi replied 3 hours ago

Please ignore this article

joyqi replied 3 hours ago

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joyqi replied 3 hours ago

2 Answers

0 Vote Up Vote Down

chemzqm answered 3 hours ago

React hot is probably because of this thing. Hotmodulereplacementplugin will also add a lot of code to the bundle

0 Vote Up Vote Down

God pig_ uuid answered 3 hours ago

1.Iterators + For..OfBabel Polyfill must be introduced. It’s on this official document
2.entryThe first two in are used in development, and the production environment should be removed.
3. The final generated file includes the CSS code. You need to evaluate how big it is (you can take a look at the extracted CSS code)extract-text-webpack-plugin)
4. Webpack itself will add some code to support modularization
5. From your screenshot,reactThe code is packaged,reactRelatively large.