Key methods for analyzing the volume of packages after Vue build include: 1. Use the built-in analysis function of Vue CLI to generate a visual report; 2. Install and configure the webpack-bundle-analyzer plug-in to view the module volume ratio; 3. Check the size of vendor.js and app.js files in the dist directory to judge the volume distribution; 4. Use npm ls, yarn list or source-map-explorer to analyze the dependency tree and specific file contents to find out the redundant introduction and optimization space.
It is actually not difficult to analyze the volume of the package after Vue is built, but many people don’t know where to start at the beginning. The most direct way is to use the report files generated by the construction tool, combined with some visualization tools to quickly locate large-volume dependencies and optimize space.
1. Use the built-in analysis function of Vue CLI
If you are using the project created by Vue CLI, you can generate an analysis report by adding a parameter during construction. implement:
vue-cli-service build --modern
Or more common:
npm run build
Then configure --modern mode in vue.config.js or enable webpack-bundle-analyzer plug-in, and you can automatically generate a visual page after the build is completed to display the volume proportion of each module.
2. Install and use webpack-bundle-analyzer
This plugin is almost a standard tool for analyzing package volume. Install it:
npm install --save-dev webpack-bundle-analyzer
Then add configuration in vue.config.js :
const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer');
module.exports = {
configureWebpack: {
plugins: [
new BundleAnalyzerPlugin()
]
}
}After running the build command again, a local page will automatically open to display all packaged modules and their sizes. This is especially useful in finding out who takes the big part.
3. Check the file structure in the dist directory
After the construction is completed, enter the dist directory and directly looking at the generated .js file size is also a quick way to judge. Especially when looking at the two files vendor.js and app.js , they are usually the largest part.
If you find vendor.js is particularly large, it is most likely because it has introduced too many third-party libraries. At this time, you can consider splitting code, loading on demand, or using a lighter alternative library.
4. Analyze the dependency tree and find out the redundant introduction
Sometimes you don’t take the initiative to introduce many libraries, but the size is still very large. At this time, you need to check the dependency tree. For example, some UI frameworks introduce all components by default, but in fact you only use a few.
You can use npm ls or yarn list to view what dependencies are introduced in the current project, or use source-map-explorer tool to analyze what content is packaged in a specific .js file.
Install source-map-explorer:
npm install --global source-map-explorer
use:
source-map-explorer dist/js/app.somehash.js
It opens a page that clearly displays the source and size of each module in this file.
Basically these methods. The key is to analyze regularly, especially after introducing new dependencies or upgrading the library version, to see if there is any surge in volume. Not complicated but easy to ignore.
The above is the detailed content of How to analyze Vue build bundle size?. For more information, please follow other related articles on the PHP Chinese website!
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