Webpack loader and plugin

debuuuug 2020-11-09 10:50:42
webpack loader plugin


For the conversion of module source code ,loader It describes webpack How to deal with non javascript modular , And in buld These dependencies are introduced in .loader You can put files from different languages ( Such as TypeScript) Convert to JavaScript, Or convert the inline image to data URL. for instance :CSS-Loader,Style-Loader etc. .

loader It's easy to use :

stay webpack.config.js It is specified in loader.module.rules You can specify multiple loader, For each of the projects loader There's an overview .

loader Is running on the NodeJS in , It can be used options Object to configure .plugin It can be for loader Bring more features .loader It can be compressed , pack , Language translation and so on .

loader Parse from template path ,npm install node_modules. You can also customize it loader, name XXX-loader.

Language class processor loader:CoffeeScript,TypeScript,ESNext(Bable),Sass,Less,Stylus. Any development technology stack can use webpack.


The aim is to solve loader Other things that can't be done , Optimize and compress from packaging , To redefine environment variables , Powerful enough to handle a variety of tasks .webpack There are many plug-ins out of the box :CommonChunkPlugin It is mainly used to extract third-party libraries and public modules , Avoid first screen loading bundle file , Or load on demand bundle Too large file size , It takes too long to load , It's a sharp tool for optimization . And in multi page applications , It is also able to create code sharing for applications between each page bundle.

webpack Powerful , The difficulty is its configuration file ,webpack4 No profile is required by default , Can pass mode The options are webpack Some default configurations are specified ,mode It is divided into :development/production, The default is production.

Plug ins can carry parameters , So in plugins Property passed in new example .

【Mode】 Can be in config File configuration , It can also be in CLI Parameter :webpack --mode=production( Usually choose in CLI, That is to say npm scripts Configuration inside ).

stay webpack4 The following versions ,webpack3.XX, adopt plugins Configure environment variables .

【resolve】 modular ,resolver It's a library , help webpack find bundle Module code to be introduced , When the packaging ,webpack Use enhanced-resolve To parse the path . 

 resolve: {
extensions: ['.js', '.vue', '.json'],
alias: { 'vue$': 'vue/dist/vue.esm.js', '@': resolve('src'),

 【Manifest】 Manage the interaction between all modules .runtime Will be able to query the module identifier , Retrieve the corresponding module behind it .

problem 1:webpack By using bundle Calculation content hash As the file name , File modification , new content hash Go to a new document , Invalid cache , But the contents of the document have not been modified , Calculated hash It will still change , because ,runtime and manifest The injection of will change with each build . To solve this file, you can learn more about runtime and manifest.

webpack principle : Start with the list of modules defined by the configuration file , Processing applications , Recursively build a dependency graph from the entry file , Then package all the modules into a small number of bundle, Usually there is only one , It can be loaded by browser .


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