babel vs babel-core vs babel-loader vs babel-preset-2015 vs babel-preset-react vs babel-polyfill

1 回答

• 26

  babel

  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.
  

  babel-core

  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.
  

  继续前进

  preset vs plugin ：

  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.
  

  babel-preset-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).
  

  babel-preset-react

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

  babel-polyfill

  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.
  

  babel-loader

  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.
  

  Isn't there any single dependency to replace them all?

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

  回复于 2024-04-29T17:18:51+08:00