巴别VS巴别核VS巴别装载机VS巴别预置-2015 VS巴别预置反应的VS巴别-填充工具

Question

我建立的WebPack我的阵营项目babel，babel-core，babel-loader，babel-preset-2015和babel-preset-react之间糊涂了。我知道，巴贝尔是需要ES7或ES6代码转换为ES5但在我package.json我已经安装了所有这些依赖关系，除了巴贝尔，他们也为devDependencies。

有人能请解释一下什么是所有这些，为什么所有的人都需要为我的项目有什么区别？难道没有任何单一的依赖全部更换？如果他们是如此重要，为什么他们列为devDependencies？

Answer 1

巴别塔

Babel doesn't do anything,It basically acts like const babel = code => code; 
by parsing the code and then generating the same code back out again.

You will need to add some plugins for Babel to do anything like transpiling es6,JSX.

巴贝尔核心

if you want to use babel in your real project, you need to install babel but 
there's no babel package available.

   babel split it up into two separate packages: babel-cli and babel-core

   **babel-cli** : which can be used to compile files from the command line.

   **babel-core** : if you want to use the Node API you can install babel-
      core, Same as "babel-cli" except you would use it programmatically inside your app.

   use "babel-cli" or "babel-core" to compile your files before production.

在行动前，

预置VS插件：

We can add features(es6,JSX) one at a time with babel plugins(es2015), 
    or 
we can use babel presets to include all the features(es6) of a particular year.

Presets make setup easier.

巴别预置-ES2015

babel-preset-env supports es2015 features and replaces es2015, es2016, 
  es2017 and latest.

So use babel-preset-env, it behaves exactly the same as babel-preset-latest 
 (or babel-preset-es2015, babel-preset-es2016, and babel-preset-es2017 together).

巴别预置反应的

transform JSX into createElement calls like transforming react pure class to 
   function and transform react remove prop-types.

巴别塔，填充工具

Without babel-polyfill, babel only allows you to use features like arrow 
 functions, destructuring, default arguments, and other syntax-specific 
 features introduced in ES6.

The new ES6 built-ins like Set, Map and Promise must be polyfilled

To include the polyfill you need to require it at the top of the entry point 
  to your application. 

巴贝尔装载机

you done with babel-core, babel-cli, and why need preset, plugins and now 
  you are compiling ES6 to ES5 on a file-by-file basis by babel-cli every time.

to get rid-off this, you need to bundle the task/js file. For that you need 
   Webpack.

Loaders are kind of like “tasks”, They gives the ability to leverage 
 webpack's bundling capabilities for all kinds of files by converting them 
 to valid modules that webpack can process.

Webpack has great Babel support through babel-loader

devDependencies

When you deploy your app, modules in dependencies need to be installed or 
your app won't work. Modules in devDependencies don't need to be installed 
on the production server since you're not developing on that machine.

These packages are only needed for development and testing.

难道没有任何单一的依赖全部更换？

as you read the above states, You need some presets and loaders to transpile 
 es2015 or JSX files.

巴贝尔 - > @babel

Since Babel 7 the Babel team switched to scoped packages, so you now 
have to use @babel/core instead of babel-core.

Your dependencies will need to be modified like so:

babel-cli -> @babel/cli. Ex:  babel- with @babel/.