Multi-page application packaging configuration

The main difference between Multi-Page Applications (MPA) and Single-Page Applications (SPA) is that each page in an MPA has its own independent HTML file. Webpack needs to generate corresponding output files for each entry file. A typical MPA project structure includes multiple page directories, with each page having its own JS and HTML files. The core of Webpack configuration involves defining multiple entry points, where each page corresponds to an entry file. The HtmlWebpackPlugin is used to generate HTML files for each page, while the SplitChunksPlugin extracts shared dependencies. Static resources such as images and fonts are also configured. The Webpack Dev Server is set up to support multi-page applications, distinguishing between development and production environments. Dynamic discovery of page directories avoids manual configuration. CSS files are processed as separate files, and build performance is optimized through caching and parallel processing. For production environments, route redirection is configured, and page-specific configuration overrides are implemented. Different deployment strategies are also considered.

Persistent cache configuration solution

In web application performance optimization, persistent caching achieves precise control through content hashing, ensuring browsers fetch the latest version when resources are updated while maximizing cache utilization. Webpack offers multiple hashing strategies, with `contenthash` being the most effective as it is based on file content changes. Configuration examples demonstrate how to set `contenthash` for resources like JS, images, and fonts. Runtime chunk splitting and module stabilization strategies enhance cache hit rates. Service Worker integration enables advanced caching strategies, while hashing algorithm optimization and cache group configuration significantly improve build efficiency and long-term caching. Multi-environment differentiation applies distinct strategies for development and production, and versioned file cleanup prevents deployment directory bloat. The combined application of these solutions can substantially boost web application performance.

The role of Scope Hoisting and how to enable it.

Scope Hoisting is an optimization feature introduced in Webpack 3 that analyzes module dependencies and merges modules into the same scope to reduce code size and improve runtime efficiency. Traditional bundling wraps each module in a separate function closure, while Scope Hoisting eliminates unnecessary closures. Its main benefits include reducing function declarations, decreasing bundle size, and enhancing execution speed. Webpack implements this via the ModuleConcatenationPlugin, with conditions for merging including: modules must be ES6 modules, dependencies must be statically analyzable, and modules must not be multiply referenced or dynamically required. It is enabled by default in production mode but can also be manually configured. When combined with Tree Shaking, it yields better results, but compatibility issues with CommonJS modules, dynamic imports, side effects, and third-party libraries should be noted. Effectiveness can be verified through various methods, and pairing it with other optimization strategies amplifies its impact. In real-world projects, challenges like module merge warnings, environment differences, and Babel configuration may arise. Advanced configuration techniques include forced merging, module exclusion, and custom strategies.

Implementation principles and configuration of Tree Shaking

Tree Shaking is a technique in modern JavaScript bundlers used to eliminate dead code by statically analyzing the import/export relationships of ES6 modules, identifying and removing unused code. Webpack implements this technology through three key points: ES6 module syntax, static analysis, and minification tools. When configuring, attention should be paid to the `usedExports` and `sideEffects` options, as production mode automatically enables optimizations. When using Babel, it’s essential to preserve ES6 module syntax. Third-party libraries need to be imported on-demand, and CSS can be optimized via specific plugins. Modules with side effects require special declarations. Advanced techniques include inline imports and scope hoisting. Debugging can be assisted with analysis tools. Compared to other tools, Rollup was the first to implement it, while ESBuild is faster. Large projects can benefit from layered optimizations, and dynamic imports also contribute. Future development directions include more precise side-effect analysis and support for new features.

Packaging volume optimization solution

Optimizing the bundle size in Webpack is crucial for improving page load speed and user experience. First, analyze the current build output using tools like Webpack Bundle Analyzer or stats.json. Code splitting can be achieved through dynamic imports and configuring SplitChunks to reasonably split the code. Tree-shaking helps remove unused code, requiring ES modules and proper configuration. Code compression, including JavaScript, CSS, and image optimization, can be done using tools like TerserPlugin and CssMinimizerWebpackPlugin. On-demand loading of third-party libraries like Lodash and Ant Design can significantly reduce size. Extracting common dependencies and using lightweight alternatives are also effective strategies. Gzip compression and cache optimization further reduce transfer size. In production, remove development code and optimize source maps. Multi-threaded builds and ESBuild can speed up the build process. Continuously monitor bundle size changes to ensure optimization effectiveness.

Build speed optimization strategy

To address the increasing build time caused by project scaling, a systematic solution for optimizing Webpack build speed is proposed. First, use `speed-measure-webpack-plugin` to analyze build bottlenecks, identifying time-consuming steps such as file parsing, loader processing, and plugin execution. Next, reduce the scope of file processing, leverage caching, and enable multi-process parallel builds to improve efficiency. Properly configure SourceMap and optimize resolution lookups to further accelerate the process. Code splitting and dependency upgrades are also effective strategies. In development environments, sacrificing certain features for speed is acceptable. Custom plugins and continuous monitoring ensure performance does not degrade. Advanced techniques like `DLLPlugin` for precompilation and environment tuning are suitable for large projects. Finally, integrate optimizations into daily workflows by regularly analyzing build times, setting time budgets, monitoring performance, and establishing benchmarks for continuous improvement. Focus on optimizing key-path loaders and plugins.

Configuration of proxy server

The Vite development server by default can only handle requests for local files. In actual development, frequent interaction with backend APIs is required, and the browser's same-origin policy restrictions can lead to cross-origin issues. Configuring a proxy server can resolve this problem. The basic proxy configuration is implemented in vite.config.js through the `server.proxy` option. The simplest setup only requires the target address, and path rewriting functionality can modify API path prefixes. Multi-target proxy support allows connecting to different backend services. Advanced configuration options include modifying request headers, proxying WebSocket, and more. Environment variable integration enables proxy targets to vary with the environment. WebSocket proxy support facilitates real-time communication, while custom middleware handles complex scenarios. Common issues include path matching and configuration effectiveness problems. Performance optimization recommendations include consolidating API paths and avoiding overly broad matching. When integrating with other tools, configuration adjustments may be necessary. Dynamic proxy support allows routing to different targets based on request conditions.

Path alias and resolution configuration

Configuring path aliases in a Vite project can improve code maintainability by setting `resolve.alias` in `vite.config.ts`, while path mappings must also be added in `tsconfig.json`. Dynamic imports should use explicit path formats for static analysis. Paths in environment variable files require special handling, such as conversion via `path.resolve`. Custom resolvers can address unique path requirements, like Markdown documents. Module extensions must be explicitly declared. In monorepo projects, path configurations need cross-package resolution. Runtime validation ensures alias correctness. TypeScript projects can enhance type hints. Production builds must handle static resource paths. Plugin development should leverage Vite's utility methods for path resolution. Browser compatibility may require polyfills for older environments. Path caching optimizes performance. Test environments need separate path mappings. Debug configurations must correctly map source paths. Multi-environment path strategies should be dynamically generated. CSS path aliases require a tilde prefix. Third-party libraries may need path redirection. Path normalization tools improve code consistency.

CSS/preprocessor integration configuration

Vite provides out-of-the-box CSS support and integrates mainstream preprocessors like Sass, Less, and Stylus, which can be used with simple configuration by installing the corresponding dependencies. It recognizes file formats and supports CSS modularization through the `.module.css` suffix. Global style variable injection is also supported via `vite.config`. PostCSS is built-in, and creating a `postcss.config.js` file allows plugin configuration. For production builds, CSS files are automatically extracted, and the CSS module class name format can be customized. Modern CSS features like variables and nesting are supported, with deep integration into frameworks like Vue and React, providing style processing solutions. Performance optimization techniques are included, such as on-demand imports and build-time optimizations. Common issues like preprocessor failures or class name conflicts are addressed. Advanced configuration options are available, such as development environment sourcemaps and maximum worker threads. It also introduces integration methods with Tailwind CSS, including installation, configuration, and usage.

Static resource handling strategy

The Vite configuration file, located at `vite.config.js` in the project root directory, allows customization of build behavior, plugins, server options, and more. Common configurations include the project root directory, public base path, static assets folder, development server options, build options, and an array of plugins. Vite employs a unique approach to handling static assets, supporting various import methods such as direct imports, explicit URL imports, raw string imports, and WebWorker imports. Files in the public directory are not processed but are directly copied to the output directory. Assets smaller than the specified threshold are inlined as base64 URLs. JSON files can be imported directly and are automatically parsed. Imported CSS files are automatically injected into the page, with support for CSS modules via specific suffixes. During the build process, Vite automatically performs code splitting and generates hashed filenames. It also supports pre-building dependencies to improve performance. Additionally, Vite handles WebAssembly, WebWorkers, binary assets, and multi-page applications by allowing multiple entry points—each HTML file corresponds to a separate entry, with automatic dependency resolution.