commonjs es module difference

This article compares CommonJS and ES modules, two distinct module systems in JavaScript, highlighting key differences in syntax, scope, dependency management, build tools, and provides guidance for converting CommonJS modules to ES modules using Bab

What are the key differences between CommonJS and ES modules?

CommonJS and ES modules are two different module systems for JavaScript. The key differences between them are:

• Syntax: CommonJS modules use the require() and module.exports syntax, while ES modules use the import and export syntax.
require() and module.exports syntax, while ES modules use the import and export syntax.
• Scope: CommonJS modules are wrapped in a function scope, while ES modules are not. This means that variables and functions in a CommonJS module are not accessible outside of the module, while variables and functions in an ES module are.
• Dependencies: CommonJS modules use a synchronous require() system to load dependencies, while ES modules use a asynchronous import() system to load dependencies.
• Build tools: CommonJS modules are typically bundled using a build tool such as Webpack or Rollup, while ES modules can be bundled using a build tool or loaded directly in the browser.

How do CommonJS and ES modules handle dependencies?

CommonJS modules use a synchronous require() system to load dependencies. This means that when a CommonJS module requires another module, the required module is loaded immediately and its exports are returned.

ES modules use an asynchronous import() system to load dependencies. This means that when an ES module imports another module, the imported module is not loaded immediately. Instead, the import()

Scope:

CommonJS modules are wrapped in a function scope, while ES modules are not. This means that variables and functions in a CommonJS module are not accessible outside of the module, while variables and functions in an ES module are.

Dependencies:

CommonJS modules use a synchronous require() system to load dependencies, while ES modules use a asynchronous import() system to load dependencies.

Build tools:🎜 CommonJS modules are typically bundled using a build tool such as Webpack or Rollup, while ES modules can be bundled using a build tool or loaded directly in the browser.🎜How do CommonJS and ES modules handle dependencies?🎜🎜CommonJS modules use a synchronous require() system to load dependencies. This means that when a CommonJS module requires another module, the required module is loaded immediately and its exports are returned.🎜🎜ES modules use an asynchronous import() system to load dependencies. This means that when an ES module imports another module, the imported module is not loaded immediately. Instead, the import() statement returns a Promise that resolves to the imported module's exports.🎜🎜How can I convert a CommonJS module to an ES module?🎜🎜There are a few ways to convert a CommonJS module to an ES module. One way is to use a build tool such as Babel. Babel is a JavaScript compiler that can convert CommonJS modules to ES modules.🎜🎜Another way to convert a CommonJS module to an ES module is to use a module wrapper. A module wrapper is a function that takes a CommonJS module as an argument and returns an ES module.🎜

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