Detailed explanation of core concepts of Webpack framework

Webpack is a front-end packaging tool (not a library or framework). It can use various resources, such as JS (including JSX), coffee, css (including less/sass), images, etc. as modules. Handling and use. This article mainly introduces the core concepts of the Webpack framework (compilation of knowledge points). Friends in need can refer to it. I hope it can help everyone.

1. Basic knowledge points

　1.1 webpack is a module packager for modern JavaScript applications (module bundler). When webpack processes an application, it recursively builds a dependency graph that contains every module the application needs, and then packages all these modules into one or more bundles.

1.2 The four core concepts of webpack:

1.2.1 entry: entry point, entry starting point (there can be multiple), webpack will start from this starting point to find out which The file is what the entry file depends on, so as to build an internal dependency graph and process it and output it to a file called bundles

　1.2.2 output (output): Specify the bundle file processed by the entry point The output path (path) and name (filename) of Packaging and other processing; webpack loader essentially converts all types of files into modules that can be directly referenced by the application's dependency graph. It has two goals:

　　　1.2.3.1 Use the test attribute to identify the corresponding Convertible files for loader

　　1.2.3.2 Use the use attribute to convert these files so that they are added to the dependency graph and eventually added to the bundle

　　If you want to use webpack When defining loader in the configuration, it must be defined in module.rules instead of rules

　1.2.4 plugins: from packaging optimization and compression to redefining variables in the environment. The plug-in interface is extremely powerful and can handle a variety of tasks

　 To use a plug-in, you only need to require() it and then add it to the plugins array. Most plugins can be customized through options. You can also use the same plug-in multiple times for different purposes in a configuration file. In this case, you need to create an instance of it by using the new operator.

　　　 Webpack provides many plugins available out of the box! Check the plug-in list for more information. For more detailed pictures and texts, please refer to the official documentation https://doc.webpack-china.org/concepts/.

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