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The content covers the three basics of HTML/CSS/JS/TS, modular development, mainstream frameworks (Vue, React, Angular, Svelte), build tools, browser plug-in development, Node.js backend practice, Next.js/Nest.js and other popular technologies.
The strategy of incrementally adopting TypeScript in front-end projects usually includes: Introducing TypeScript If we have a simple JavaScript module utils.js, which contains a function for calculating the sum of two numbers: // utils.js export func...
Progressive Web Apps (PWAs) utilize offline storage strategies to provide an offline experience, enabling access to some content even when the network is unavailable. The two primary offline storage t
WebGL (Web Graphics Library) is a JavaScript API that enables hardware-accelerated 3D graphics rendering in any compatible web browser without the need for plugins. Based on the OpenGL standard, it in
Deno, as a modern alternative to Node.js, offers numerous improvements and innovations, particularly in security, module systems, and developer experience. Although still in development, Deno is a com
React Query is a powerful state management library designed for handling data fetching, caching, and updating, particularly suited for API interactions. It offers advanced features such as automatic caching, offline state management, data expiration,...
Generics In TypeScript, generics are a powerful tool that allow us to write reusable components capable of adapting to multiple types. 1. Generic Constraints Generics can be constrained to a specific type or interface, ensuring that the types passed ...
Webpack 5 implements long-term caching through deterministic Chunk IDs, module IDs, and export IDs, which means that the same input will always produce the same output. In this way, when your users visit the updated website again, the browser can reuse the old cache instead of re-downloading all resources.
// webpack.config.js
module.exports = {
// ...
output: {
// Use contenthash to ensure that the file name is associated with the content
filename: '[name].[contenthash].js',
chunkFilename: '[name].[contenthash].chunk.js',
// Configure the asset hash to ensure long-term caching
assetModuleFilename: '[name].[contenthash][ext][query]',
// Use file system cache
cache: {
type: 'filesystem',
},
},
// ...
};
Webpack 5 enhances the efficiency of Tree Shaking, especially the support for ESM.
// package.json
{
"sideEffects": false, // Tell Webpack that this package has no side effects and can safely remove unreferenced code
}
// library.js
export function myLibraryFunction() {
// ...
}
// main.js
import { myLibraryFunction } from './library.js';
The concatenateModules option of Webpack 5 can combine small modules to reduce the number of HTTP requests. However, this feature may increase memory consumption, so it is necessary to use it with a trade-off:
// webpack.config.js
module.exports = {
// ...
optimization: {
concatenateModules: true, // Defaults to true, but may need to be turned off in some cases
},
// ...
};
Webpack 5 no longer automatically injects polyfills for Node.js core modules. Developers need to manually import them according to the target environment:
// If you need to be compatible with older browsers, you need to manually import polyfills
import 'core-js/stable';
import 'regenerator-runtime/runtime';
// Or use babel-polyfill
import '@babel/polyfill';
Use cache: Configure cache.type:'filesystem' to use the file system cache to reduce repeated builds.
SplitChunks optimization: Adjust optimization.splitChunks according to project requirements, for example:
// webpack.config.js
module.exports = {
// ...
optimization: {
splitChunks: {
chunks: 'all',
minSize: 10000, // Adjust the appropriate size threshold
maxSize: 0, // Allow code chunks of all sizes to be split
},
},
// ...
};
Module resolution optimization: Reduce the overhead of module resolution through resolve.mainFields and resolve.modules configurations.
Parallel compilation: Use threads-loader or worker-loader to process tasks in parallel and speed up compilation.
Code splitting: Use dynamic import (import()) to load code on demand and reduce initial loading time.
// main.js
import('./dynamic-feature.js').then((dynamicFeature) => {
dynamicFeature.init();
});
// webpack.config.js
module.exports = {
// ...
experiments: {
outputModule: true, // Enable output module support
},
// ...
};
Although Webpack 5 itself has optimized Tree shaking, developers can further improve its effect through some strategies. Make sure your code follows the following principles:
Avoid global variable pollution: Global variables prevent Tree shaking from identifying unused code.
Use pure functions: Make sure the function has no side effects so that Webpack can safely remove uncalled functions.
Explicit exports: Using explicit exports (export const func = ... instead of export default func) helps Tree shaking work more accurately.
Dead Code Elimination: Combined with ESLint's no-unused-vars rule, ensure that there are no unused imports.
Reduce Loader usage: Each Loader will increase build time. Use Loaders only when necessary and consider whether the functions of some Loaders can be merged.
Loader cache: Make sure that the Loader supports and enables caching, for example, using the cacheDirectory option.
Choose efficient plugins: Some plugins may have a greater impact on performance. Evaluate and choose better-performing alternatives, or adjust their configuration to reduce overhead.
Source Map is essential for debugging, but it also increases build time and output size. You can adjust the Source Map type according to the environment:
// webpack.config.js
module.exports = {
// ...
devtool: isProduction ? 'source-map' : 'cheap-module-source-map', // Use a smaller Source Map in production environment
// ...
};
Asset Modules: Webpack 5 introduces Asset Modules, which can directly process images and other static resources without additional configuration of Loader. This feature can simplify configuration and improve performance.module.exports = {
// ...
module: {
rules: [
{
test: /\.(png|jpe?g|gif|svg)$/i,
type: 'asset/resource', // Automatic resource processing
},
],
},
// ...
};
image-webpack-loader to automatically compress images during build to reduce file size.Use Webpack Bundle Analyzer: This is a powerful visualization tool that helps you understand the composition of the output package, identify large modules, and then optimize them.
Regularly review dependencies: Use tools such as npm audit or yarn audit to check the security and update status of dependencies, and promptly remove packages that are no longer used or upgrade to lighter alternatives.