There’s an easy way to fix the “Uncaught ReferenceError: require is not defined” error message in Node.js, but the require method is no longer default for ES Modules in Node.js. One solution is to use a packager, which compiles your code into one file and removes the require statement. Some bundlers also convert require calls into imports, which most browsers support.
ES Modules in Node >= 14 no longer have require by default
Node versions over 14 no longer use the ES Modules by default. As a result, you no longer need to add require by default to your Node scripts or files. The default modules are stored in /Users/retina/Desktop/es-modules-in-Node/b.js. However, if you wish to use the ES Modules by default, you must replace the require statements with import’s.
If you are building a new NodeJS application, you don’t need to switch to ES Modules right away. CommonJS is a great alternative if you are unable to migrate to ES Modules right away. However, if you have an existing project, you can migrate to CommonJS with ease using tools like Babel or TypeScript. After your new project is ready, you can use ES Modules.
CommonJS does not know which modules are exported until the module is evaluated. ES Modules already parse the imported symbols before the code is evaluated, which creates an internal Module Record. Therefore, Node will not have to worry about require by default when using CJS scripts. The ESM module loader automatically downloads and runs the scripts in order, guaranteeing order and scope.
Another change to the ES Modules API is that the loaders API is being redesigned. Previously, the loaders API had a getGlobalPreloadCode() method, which returns a string that runs as a sloppy-mode script on startup. Now, this API has been replaced with module.createRequire(). The new loader has improved performance.
Exporting functions from ES Modules to CommonJS Modules
You can use both qualified and unqualified import statements. Qualified imports provide direct access to the module export object, while unqualified imports are copies of the exported object. You can split your code into different modules, as long as they share the same import values. Using module folding allows you to group together multiple modules in a single code base, simplifying your development process. In a nutshell, exporting functions from ES Modules to CommonJS Modules is a snap!
Dynamic imports work a bit differently. Dynamic imports require no wrapping scripts or out-of-order execution. Because they’re static, dynamic imports aren’t necessary. And since they’re static, ES Modules don’t require a wrapper script, which means the loader doesn’t need to analyze the module tree and remove dead code.
When exporting functions from ES Modules to CommonJs Modules, you must be careful not to mix module types. Webpack has many features that are specific to modules and it’s important not to mix them. You can use one method or the other for the same export. It’s recommended to use one export method instead of combining the two. This way, your code will be compatible with both.
When exporting functions from ES Modules to CommonJs Modules, you need to be aware of the limitations of each. For example, you can’t export AMD modules into CommonJS Modules. If you’re worried about compatibility, you should consider using polyfills or other libraries that will bring support to older engines. For more information, please visit my GitHub page. The code in this section can be found on GitHub.
To export ES Modules to CommonJS Modules, you must first install webpack and npm. You can also check out the CommonJS code. It uses the IIFE Module Pattern. When creating ES Modules, you need to create a big IIFE Module, which is wrapped inside of another big IIFE. This is the best way to export ES Modules to CommonJS Modules.
In the ES module graph, the scripts are downloaded in parallel and executed in order. However, in the case of ES Modules, the scripts are compiled into ES5 by default. The resulting ES5 code may not be fully compliant with the ES6 spec, so it may not interoperate with native CommonJS and AMD modules. However, Babel complies with the ES6 spec pretty closely.
Fixing uncaught referenceerror require is not defined
In most browsers, the require method doesn’t exist. To get around this problem, you can use a bundler. Bundlers compile your code into a single, compatible file and remove the require statement. Some bundlers also convert require calls to import, which is supported by most browsers. This will prevent you from having to deal with an uncaught referenceerror. If you’re unsure whether your code is using a require statement, check out this helpful guide.