Common FuseBox Issues and Solutions

1. Module Not Found Errors

FuseBox fails to resolve certain modules, resulting in build failures.

Root Causes:

• Incorrect module paths or missing dependencies.
• Incompatible module resolution strategies.
• Typo in import statements.

Solution:

Ensure required dependencies are installed:

npm install module-name

Use absolute paths where necessary:

import myModule from "@app/utils";

Configure the correct alias in fuse.js:

const { fusebox } = require("fuse-box");fusebox({    target: "browser",    alias: {        "@app": "./src/app"    }}).runDev();

2. Slow Build Performance

FuseBox builds take too long, especially for large projects.

Root Causes:

• Unoptimized bundling configuration.
• Too many unnecessary files being bundled.
• Lack of caching or incremental builds.

Solution:

Enable caching for faster builds:

fusebox({    cache: true}).runDev();

Exclude unnecessary files from bundling:

fusebox({    entry: "src/index.ts",    instructions: "!> [index.ts] +src/** -**/*.test.ts"}).runDev();

Use watch mode for incremental builds:

fusebox({    watch: true}).runDev();

3. Tree Shaking Not Working

Unused code is not removed, leading to larger bundle sizes.

Root Causes:

• Tree shaking disabled in configuration.
• Code structure prevents dead code elimination.
• Third-party libraries not supporting ES modules.

Solution:

Ensure tree shaking is enabled:

fusebox({    target: "browser",    treeShaking: true}).runProd();

Ensure ES module imports are used:

import { myFunction } from "./utils";

Check for unused exports:

fusebox({    showWarnings: true}).runProd();

4. Plugin Not Working Properly

FuseBox plugins fail to execute or produce incorrect results.

Root Causes:

• Plugin configuration errors.
• Incompatible versions of plugins.
• Incorrect usage of plugin syntax.

Solution:

Ensure the correct plugin configuration:

const { pluginSass } = require("fuse-box/plugins");fusebox({    plugins: [pluginSass()]}).runDev();

Update plugins to the latest versions:

npm update fuse-box

Verify plugin execution in logs:

fusebox({    logging: { level: "verbose" }}).runDev();

5. Output Bundles Not Loading in Browser

Compiled bundles do not execute correctly in the browser.

Root Causes:

• Incorrect public path configuration.
• Bundle file not linked correctly in index.html.
• Cross-origin errors preventing script execution.

Solution:

Ensure the correct output directory:

fusebox({    output: "dist/$name.js"}).runDev();

Ensure correct script inclusion in HTML:

<script src="/./dist/index.js"></script>

Check browser console for errors and adjust CORS settings if necessary.

Best Practices for FuseBox Development

• Enable caching and watch mode for faster development builds.
• Use tree shaking to remove dead code and reduce bundle size.
• Optimize dependency resolution with aliasing.
• Keep plugins updated and correctly configured.
• Test output bundles in different environments before production.

Conclusion

By troubleshooting module resolution failures, slow builds, tree shaking issues, plugin failures, and bundle loading problems, developers can effectively manage FuseBox for JavaScript and TypeScript applications. Implementing best practices improves build performance and reduces output size.

FAQs

1. Why is my FuseBox build failing with a module not found error?

Ensure dependencies are installed, use correct import paths, and configure aliases properly.

2. How do I improve build performance in FuseBox?

Enable caching, use watch mode for incremental builds, and exclude unnecessary files from bundling.

3. Why is tree shaking not reducing my bundle size?

Ensure tree shaking is enabled, use ES module imports, and remove unused exports.

4. How do I fix plugin-related errors in FuseBox?

Check plugin configuration, update plugins to the latest versions, and enable verbose logging.

5. Why is my bundled JavaScript not loading in the browser?

Verify the output directory, check script inclusion in HTML, and troubleshoot CORS-related issues.