search
HomeWeb Front-endFront-end Q&ACan the es module be executed in node?

The es module can be executed in node; node has supported the native es module since version 8.5.2. This function can be turned on through the command line option. The es module, also known as the ECMAScript module, is a JavaScript code reuse mechanism. , but require() cannot be used in the es module.

Can the es module be executed in node?

The operating environment of this article: Windows 10 system, nodejs version 12.19.0, Dell G3 computer.

es modules can be executed in node

Starting from version 8.5.0, Node.js begins to support native ES modules, and this feature can be turned on through command line options. The new features are largely due to Bradley Farias.

1. Demonstration

The code directory structure of this example is as follows:

esm-demo/
 lib.mjs
 main.mjs

lib.mjs:

export function add(x, y) {
 return x + y;
}

main.mjs:

import {add} from './lib.mjs';
console.log('Result: '+add(2, 3));

Run the demo:

$ node --experimental-modules main.mjs
Result: 5

2. Checklist: Things to note

ES module:

·You cannot import modules dynamically. However, work on dynamic import() is in progress and support should be available soon.

·No meta variables such as __dirname and __filename. However, there is a proposal for a similar function: "import.meta". It might look like this:

console.log(import.meta.url);

·Now all module identifiers are URLs (this part is new in Node.js) :

·File - relative path with file extension: ../util/tools.mjs

·Library - no file extension and no path lodash

· How to better make npm libraries available in browsers (without using bundler) remains to be seen. One possibility is to introduce RequireJS-style configuration data that maps paths to actual paths. Currently, it is illegal to use bare path module identifiers in browsers.

Interoperability with CJS modules

You can import CJS modules, but they always only have the default export - that is, the value of module.exports. Making CJS modules support named exports is already being worked on, but may take a while. If you can help, you can do it.

import fs1 from 'fs';
console.log(Object.keys(fs1).length); // 86
import * as fs2 from 'fs';
console.log(Object.keys(fs2)); // ['default']

· You cannot use require() in ES modules. The main reason is:

· Path resolution works slightly differently: ESM does not support NODE_PATH and require.extensions. Also, the fact that its identifier is always a URL causes some slight differences.

· ES modules are always loaded asynchronously, which ensures maximum compatibility with the web. This loading style cannot be mixed with synchronous loading of CJS modules via require().

· Disabling synchronous module loading also leaves a fallback path for Top-level await imports of ES modules (a feature currently under consideration).

Recommended learning: "nodejs video tutorial"

The above is the detailed content of Can the es module be executed in node?. For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
The Benefits of React: Performance, Reusability, and MoreThe Benefits of React: Performance, Reusability, and MoreApr 15, 2025 am 12:05 AM

React’s popularity includes its performance optimization, component reuse and a rich ecosystem. 1. Performance optimization achieves efficient updates through virtual DOM and diffing mechanisms. 2. Component Reuse Reduces duplicate code by reusable components. 3. Rich ecosystem and one-way data flow enhance the development experience.

React: Creating Dynamic and Interactive User InterfacesReact: Creating Dynamic and Interactive User InterfacesApr 14, 2025 am 12:08 AM

React is the tool of choice for building dynamic and interactive user interfaces. 1) Componentization and JSX make UI splitting and reusing simple. 2) State management is implemented through the useState hook to trigger UI updates. 3) The event processing mechanism responds to user interaction and improves user experience.

React vs. Backend Frameworks: A ComparisonReact vs. Backend Frameworks: A ComparisonApr 13, 2025 am 12:06 AM

React is a front-end framework for building user interfaces; a back-end framework is used to build server-side applications. React provides componentized and efficient UI updates, and the backend framework provides a complete backend service solution. When choosing a technology stack, project requirements, team skills, and scalability should be considered.

HTML and React: The Relationship Between Markup and ComponentsHTML and React: The Relationship Between Markup and ComponentsApr 12, 2025 am 12:03 AM

The relationship between HTML and React is the core of front-end development, and they jointly build the user interface of modern web applications. 1) HTML defines the content structure and semantics, and React builds a dynamic interface through componentization. 2) React components use JSX syntax to embed HTML to achieve intelligent rendering. 3) Component life cycle manages HTML rendering and updates dynamically according to state and attributes. 4) Use components to optimize HTML structure and improve maintainability. 5) Performance optimization includes avoiding unnecessary rendering, using key attributes, and keeping the component single responsibility.

React and the Frontend: Building Interactive ExperiencesReact and the Frontend: Building Interactive ExperiencesApr 11, 2025 am 12:02 AM

React is the preferred tool for building interactive front-end experiences. 1) React simplifies UI development through componentization and virtual DOM. 2) Components are divided into function components and class components. Function components are simpler and class components provide more life cycle methods. 3) The working principle of React relies on virtual DOM and reconciliation algorithm to improve performance. 4) State management uses useState or this.state, and life cycle methods such as componentDidMount are used for specific logic. 5) Basic usage includes creating components and managing state, and advanced usage involves custom hooks and performance optimization. 6) Common errors include improper status updates and performance issues, debugging skills include using ReactDevTools and Excellent

React and the Frontend Stack: The Tools and TechnologiesReact and the Frontend Stack: The Tools and TechnologiesApr 10, 2025 am 09:34 AM

React is a JavaScript library for building user interfaces, with its core components and state management. 1) Simplify UI development through componentization and state management. 2) The working principle includes reconciliation and rendering, and optimization can be implemented through React.memo and useMemo. 3) The basic usage is to create and render components, and the advanced usage includes using Hooks and ContextAPI. 4) Common errors such as improper status update, you can use ReactDevTools to debug. 5) Performance optimization includes using React.memo, virtualization lists and CodeSplitting, and keeping code readable and maintainable is best practice.

React's Role in HTML: Enhancing User ExperienceReact's Role in HTML: Enhancing User ExperienceApr 09, 2025 am 12:11 AM

React combines JSX and HTML to improve user experience. 1) JSX embeds HTML to make development more intuitive. 2) The virtual DOM mechanism optimizes performance and reduces DOM operations. 3) Component-based management UI to improve maintainability. 4) State management and event processing enhance interactivity.

React Components: Creating Reusable Elements in HTMLReact Components: Creating Reusable Elements in HTMLApr 08, 2025 pm 05:53 PM

React components can be defined by functions or classes, encapsulating UI logic and accepting input data through props. 1) Define components: Use functions or classes to return React elements. 2) Rendering component: React calls render method or executes function component. 3) Multiplexing components: pass data through props to build a complex UI. The lifecycle approach of components allows logic to be executed at different stages, improving development efficiency and code maintainability.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
1 months agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

SublimeText3 English version

SublimeText3 English version

Recommended: Win version, supports code prompts!

Safe Exam Browser

Safe Exam Browser

Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment

Dreamweaver Mac version

Dreamweaver Mac version

Visual web development tools

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools