How to view the source code of vue dependencies

Vue.js is a popular JavaScript framework. Although its source code is complex, it is still loved by developers. As a developer, if you want to better understand the internal principles of Vue.js, you not only need to master its API design, but also learn how to read the dependency source code of Vue.js. This article will introduce the steps and methods of how to view the source code of Vue.js dependencies to help developers better understand the underlying implementation of Vue.js.

1. Introduction to dependent source code

When learning Vue.js source code, it is inevitable to involve dependent source code. What is source code dependency? Simply put, dependency source code is the internal dependency library of Vue.js, that is, other libraries that its own core code depends on. These libraries are introduced or called by Vue.js to provide them with a variety of functions and tools to ensure the stability and functional completeness of Vue.js.

Vue.js relies on source code that contains many libraries, which mainly include the following:

1. vue-template-compiler: Vue.js compiler, used to compile templates into Rendering function.
2. vue-server-renderer: Server-side rendering library for Vue.js, used to render Vue.js applications into HTML strings and send them to the client.
3. vue-loader: Used to load Vue components in Webpack, supporting the syntax of Vue single-file components, as well as various CSS preprocessors and JS preprocessors.
4. vuex: Vue.js's state management library provides a global state management mechanism for applications.
5. vue-router: A routing management library for Vue.js, used to implement routing jumps and processing.

2. How to view Vue.js dependent source code

After understanding the concept of Vue.js dependent source code, below we will introduce how to view Vue.js dependent source code.

1. Clone Vue.js source code

First of all, we need to clone the source code of Vue.js before we can happily study and analyze the source code. Search for Vue.js on GitHub and select its official repository to find the source code address of Vue.js.

Use Git command to clone it locally:

git clone https://github.com/vuejs/vue.git

2. Installation dependencies

Since Vue.js has many dependent libraries, we need You must first install the dependencies before you can run the source code of Vue.js correctly locally. Dependencies can be installed via NPM or Yarn.

Use NPM to install:

npm install

Use Yarn to install:

yarn install

3. View the dependency source code

After installing the dependency, we can Learn about the dependent libraries of Vue.js by viewing the source code. Specifically, this can be achieved through the following steps:

1. Open the package.json file in the Vue.js source code root directory to view project dependencies and version information.
2. Enter the node_modules folder and you can see many folders of Vue.js dependent libraries. By opening these folders, you can see the source code implementation of each dependent library.

Take vue-template-compiler as an example. Its source code implementation is distributed in the node_modules/vue-template-compiler folder. Open the folder and we can find its source code implementation, which contains:

src
    ├── errors.js
    ├── module.js
    ├── optimizer.js
    ├── parser.js
    ├── tokenizer.js
    ├── transform-attrs.js
    ├── transform-else-if.js
    ├── transform-for.js
    ├── transform-if.js
    ├── transform-node.js
    ├── transform-slot.js
    ├── transform-text.js
    ├── utils.js
    └── codegen
        ├── generate.js
        └── index.js

These source code files implement each module of the template compilation process, among which the parser.js file implements HTML parsing The transform-if.js and transform-for.js files implement the v-if and v-for in the Vue.js template Function, generate.js file implements the generation of rendering functions and so on.

By reading these source code files, we can gradually gain a deeper understanding of the implementation principles of the compilation process of Vue.js, as well as the implementation methods and functions of internal dependent libraries.

4. View dependent library source code documents and API

In addition to reading source code files, we can also have a deeper understanding of its implementation principles and usage by viewing the documentation of dependent libraries. . In the official documentation, Vue.js provides detailed and clear instructions for its internal dependent libraries, including usage methods, API interfaces, functional changes in different versions, etc.

Take the vue-template-compiler library as an example. Its official document address is: https://vuejs.org/v2/guide/migration-vue-template-compiler.html#Introduction. In this document, we can find the relevant reference methods, API interfaces, functional changes and other detailed information of the library, which is convenient for developers to understand and use.

Summary

Through the above introduction, we can know how to view the source code of Vue.js dependencies. Developers can gain a deeper understanding of the internal implementation principles of Vue.js and the functions and usage of each dependent library by downloading the source code, installing dependencies, viewing dependency source codes, and viewing documentation. This not only helps developers better use Vue.js, but also improves their JavaScript language coding and analysis capabilities.

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