Share the detailed steps for installing two different versions of dependencies in the Vue project

In a Vue project, different versions of dependencies may need to be installed. For example, you use a Vue component library in your project. Some components of this component library require Vue version 2.x, but your project uses Vue 3.x version. At this time, you need to install two different versions of Vue in the project at the same time.

The following are the detailed steps on how to install two different versions of dependencies in the Vue project:

1. Execute the following command in the project root directory to install the npm module yarn:

npm install -g yarn

2. Execute the following command in the project root directory to initialize the project:

yarn init

3. Create a new one named packages in the project root directory Folder used to store dependent source code.
4. Create two new subdirectories in the packages directory, vue2 and vue3, for installing Vue 2.x and Vue 3.x respectively. rely.
5. Enter the vue2 directory and execute the following command to install the dependencies of Vue 2.x:

yarn add vue@2.x.x

Among them, 2.x.x is you The Vue 2.x version number that needs to be installed.

6. Enter the vue3 directory and execute the following command to install the dependencies of Vue 3.x:

yarn add vue@^3.0.0

Among them, ^3.0.0 is the Vue 3.x version number you need to install.

7. Add the following code to the package.json file in the project root directory to configure the module path alias:

{
  "name": "my-project",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "modules": {
    "vue2": {
      "paths": [
        "packages/vue2/node_modules"
      ]
    },
    "vue3": {
      "paths": [
        "packages/vue3/node_modules"
      ]
    }
  }
}

Among them, vue2 and vue3 are the directory names where you install Vue 2.x and Vue 3.x.

8. Create a new vue.config.js file in the project root directory and add the following code:

module.exports = {
  chainWebpack: (config) => {
    config.resolve.alias
      .set('vue', 'vue2')
      .set('vue3', 'vue') 
  },
}

Among them, configure set ('vue', 'vue2') is to set the default path of Vue to the directory where Vue 2.x is installed.

Configuration set('vue3', 'vue') is to set the path of Vue 3.x to the vue3 directory.

In this way, when you reference Vue in a component, Webpack will find the corresponding version of Vue dependency based on the configured alias path.

9. Reference different versions of Vue dependencies in the component as follows:

import Vue2 from 'vue2'
import Vue3 from 'vue3'

At this point, you have successfully installed two different versions of dependencies in the Vue project. . When you need to use the features of Vue 2.x and Vue 3.x in your components, you only need to reference the dependencies of the corresponding versions as mentioned above.

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