Enable experimental ES modules support
📦 Node.js-> Command Line
✨ The Prompt Phrase
node --experimental-modules app.js
💻 Code Preview
📦 All-in-One Code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Enable experimental ES modules support - Interactive Tutorial</title>
<link href="https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600;700;900&family=Fira+Code:wght@400;500;600&display=swap" rel="stylesheet">
<style>
:root {
--bg-primary: #0a0e27;
--bg-secondary: #151932;
--bg-card: #1e2139;
--accent-purple: #a855f7;
--accent-blue: #3b82f6;
--accent-green: #10b981;
--accent-red: #ef4444;
--accent-yellow: #f59e0b;
--accent-pink: #ec4899;
--accent-cyan: #06b6d4;
--accent-lime: #84cc16;
--accent-indigo: #6366f1;
--text-primary: #f8fafc;
--text-secondary: #94a3b8;
--gradient-experimental: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
--gradient-modules: linear-gradient(135deg, #ec4899 0%, #f59e0b 100%);
--shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: 'Poppins', sans-serif;
background: var(--bg-primary);
color: var(--text-primary);
line-height: 1.6;
overflow-x: hidden;
}
.container {
max-width: 1200px;
margin: 0 auto;
padding: 20px;
}
.progress-container {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 5px;
background: var(--bg-secondary);
z-index: 1000;
}
.progress-bar {
height: 100%;
background: var(--gradient-experimental);
width: 0%;
transition: width 0.3s ease;
}
.hero {
text-align: center;
padding: 100px 20px;
background: var(--gradient-experimental);
position: relative;
overflow: hidden;
border-radius: 0 0 50px 50px;
}
.hero::before {
content: '';
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="2" fill="white" opacity="0.1"/></svg>');
animation: float 20s linear infinite;
}
@keyframes float {
from { transform: translateY(0); }
to { transform: translateY(-100px); }
}
.hero-content {
position: relative;
z-index: 1;
}
.experimental-icon {
font-size: 5rem;
margin-bottom: 20px;
animation: experimentalSpin 3s ease-in-out infinite;
}
@keyframes experimentalSpin {
0%, 100% { transform: rotate(0deg) scale(1); }
50% { transform: rotate(180deg) scale(1.1); }
}
.command-display {
display: inline-block;
background: rgba(0, 0, 0, 0.4);
padding: 25px 40px;
border-radius: 15px;
font-family: 'Fira Code', monospace;
font-size: 1.2rem;
margin: 30px 0;
border: 3px solid rgba(255, 255, 255, 0.3);
animation: pulse 2s ease-in-out infinite;
color: white;
font-weight: 600;
}
@keyframes pulse {
0%, 100% { transform: scale(1); }
50% { transform: scale(1.05); }
}
.hero h1 {
font-size: 3.5rem;
font-weight: 900;
margin-bottom: 20px;
color: white;
text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}
.hero p {
font-size: 1.4rem;
opacity: 0.95;
color: white;
}
.deprecated-badge {
display: inline-block;
background: var(--accent-red);
color: white;
padding: 8px 16px;
border-radius: 20px;
font-size: 0.9rem;
font-weight: 600;
margin-top: 15px;
}
.section {
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}
.section-title {
font-size: 2.5rem;
margin-bottom: 30px;
background: var(--gradient-experimental);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
background-clip: text;
display: inline-block;
font-weight: 700;
}
.card {
background: var(--bg-card);
border-radius: 20px;
padding: 40px;
margin: 30px 0;
box-shadow: var(--shadow);
border: 1px solid rgba(255, 255, 255, 0.05);
transition: transform 0.3s ease;
}
.card:hover {
transform: translateY(-5px);
}
.code-block {
background: #1e1e1e;
border-radius: 15px;
padding: 25px;
margin: 20px 0;
font-family: 'Fira Code', monospace;
position: relative;
}
.code-header {
display: flex;
justify-content: space-between;
align-items: center;
margin-bottom: 15px;
padding-bottom: 15px;
border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.terminal-dots {
display: flex;
gap: 6px;
}
.terminal-dot {
width: 12px;
height: 12px;
border-radius: 50%;
}
.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }
.copy-btn {
background: var(--accent-purple);
color: white;
border: none;
padding: 8px 16px;
border-radius: 8px;
cursor: pointer;
font-size: 0.9rem;
transition: all 0.3s ease;
}
.copy-btn:hover {
background: var(--accent-blue);
transform: scale(1.05);
}
.copy-btn.copied {
background: var(--accent-green);
}
pre {
margin: 0;
overflow-x: auto;
}
code {
color: #e0e0e0;
font-size: 0.95rem;
line-height: 1.8;
}
.code-comment { color: #6a9955; }
.code-string { color: #ce9178; }
.code-keyword { color: #569cd6; }
.code-property { color: #9cdcfe; }
.code-flag { color: #a855f7; font-weight: 600; }
.code-import { color: #c586c0; }
.steps {
counter-reset: step-counter;
}
.step {
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border-radius: 15px;
padding: 30px;
margin: 20px 0;
position: relative;
padding-left: 100px;
transition: all 0.3s ease;
}
.step:hover {
background: var(--bg-card);
transform: translateX(10px);
}
.step::before {
counter-increment: step-counter;
content: counter(step-counter);
position: absolute;
left: 20px;
top: 50%;
transform: translateY(-50%);
width: 60px;
height: 60px;
background: var(--gradient-experimental);
border-radius: 50%;
display: flex;
align-items: center;
justify-content: center;
font-size: 1.8rem;
font-weight: 900;
color: white;
}
.step h3 {
color: var(--accent-indigo);
margin-bottom: 10px;
font-size: 1.5rem;
}
.feature-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
gap: 25px;
margin: 30px 0;
}
.feature-card {
background: var(--bg-secondary);
padding: 30px;
border-radius: 15px;
text-align: center;
transition: all 0.3s ease;
border: 2px solid transparent;
}
.feature-card:hover {
border-color: var(--accent-purple);
transform: translateY(-10px);
}
.feature-icon {
font-size: 3.5rem;
margin-bottom: 15px;
}
.feature-title {
font-weight: 600;
color: var(--accent-indigo);
margin-bottom: 10px;
font-size: 1.3rem;
}
.demo-container {
background: var(--bg-secondary);
border-radius: 20px;
padding: 40px;
margin: 30px 0;
}
.terminal {
background: #1e1e1e;
border-radius: 15px;
padding: 20px;
font-family: 'Fira Code', monospace;
min-height: 300px;
margin: 20px 0;
overflow-y: auto;
max-height: 500px;
}
.terminal-line {
margin: 10px 0;
}
.terminal-prompt {
color: var(--accent-green);
}
.demo-button {
background: var(--gradient-experimental);
color: white;
border: none;
padding: 15px 40px;
border-radius: 50px;
font-size: 1.1rem;
font-weight: 600;
cursor: pointer;
transition: all 0.3s ease;
display: inline-flex;
align-items: center;
gap: 10px;
margin: 10px;
}
.demo-button:hover {
transform: scale(1.05);
box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
}
.timeline {
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padding: 20px 0;
}
.timeline::before {
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position: absolute;
left: 30px;
top: 0;
bottom: 0;
width: 2px;
background: var(--gradient-experimental);
}
.timeline-item {
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margin-bottom: 30px;
}
.timeline-dot {
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left: 20px;
width: 20px;
height: 20px;
background: var(--accent-purple);
border-radius: 50%;
border: 4px solid var(--bg-primary);
}
.timeline-content {
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padding: 20px;
border-radius: 10px;
}
.comparison-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
margin: 30px 0;
}
.comparison-item {
background: var(--bg-secondary);
padding: 25px;
border-radius: 15px;
border: 2px solid transparent;
}
.comparison-item.old {
border-color: var(--accent-red);
}
.comparison-item.new {
border-color: var(--accent-green);
}
.comparison-item h4 {
margin-bottom: 15px;
font-size: 1.3rem;
}
.tabs {
display: flex;
gap: 10px;
margin-bottom: 20px;
flex-wrap: wrap;
}
.tab {
padding: 12px 24px;
background: var(--bg-secondary);
border: none;
border-radius: 10px;
color: var(--text-primary);
cursor: pointer;
transition: all 0.3s ease;
font-size: 1rem;
}
.tab:hover {
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}
.tab.active {
background: var(--gradient-experimental);
color: white;
}
.tab-content {
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}
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}
.accordion-header {
cursor: pointer;
display: flex;
justify-content: space-between;
align-items: center;
padding: 20px;
background: var(--bg-secondary);
border-radius: 12px;
margin: 15px 0;
transition: all 0.3s ease;
}
.accordion-header:hover {
background: var(--bg-card);
}
.accordion-icon {
transition: transform 0.3s ease;
font-size: 1.2rem;
}
.accordion-icon.active {
transform: rotate(180deg);
}
.accordion-content {
max-height: 0;
overflow: hidden;
transition: max-height 0.3s ease;
}
.accordion-content.active {
max-height: 2000px;
}
.accordion-body {
padding: 20px;
background: var(--bg-secondary);
border-radius: 12px;
margin-top: 5px;
}
.tip, .warning, .success, .info {
padding: 20px;
border-radius: 10px;
margin: 20px 0;
}
.tip {
background: rgba(59, 130, 246, 0.1);
border-left: 4px solid var(--accent-blue);
}
.tip::before { content: '💡 '; font-size: 1.5rem; }
.warning {
background: rgba(239, 68, 68, 0.1);
border-left: 4px solid var(--accent-red);
}
.warning::before { content: '⚠️ '; font-size: 1.5rem; }
.success {
background: rgba(16, 185, 129, 0.1);
border-left: 4px solid var(--accent-green);
}
.success::before { content: '✅ '; font-size: 1.5rem; }
.info {
background: rgba(236, 72, 153, 0.1);
border-left: 4px solid var(--accent-pink);
}
.info::before { content: '🔍 '; font-size: 1.5rem; }
.quiz-container {
background: var(--bg-card);
border-radius: 20px;
padding: 40px;
margin: 30px 0;
}
.quiz-question {
margin: 30px 0;
}
.quiz-question h3 {
color: var(--accent-purple);
margin-bottom: 20px;
font-size: 1.3rem;
}
.quiz-options {
display: flex;
flex-direction: column;
gap: 15px;
}
.quiz-option {
background: var(--bg-secondary);
padding: 20px;
border-radius: 12px;
cursor: pointer;
transition: all 0.3s ease;
border: 2px solid transparent;
}
.quiz-option:hover {
border-color: var(--accent-blue);
transform: translateX(10px);
}
.quiz-option.correct {
border-color: var(--accent-green);
background: rgba(16, 185, 129, 0.1);
}
.quiz-option.incorrect {
border-color: var(--accent-red);
background: rgba(239, 68, 68, 0.1);
}
.quiz-feedback {
margin-top: 15px;
padding: 15px;
border-radius: 10px;
display: none;
}
.quiz-feedback.show {
display: block;
}
.quiz-feedback.correct {
background: rgba(16, 185, 129, 0.1);
border-left: 4px solid var(--accent-green);
}
.quiz-feedback.incorrect {
background: rgba(239, 68, 68, 0.1);
border-left: 4px solid var(--accent-red);
}
.cheat-sheet {
background: var(--gradient-experimental);
border-radius: 20px;
padding: 40px;
margin: 30px 0;
color: white;
}
.cheat-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
gap: 20px;
margin-top: 30px;
}
.cheat-item {
background: rgba(255, 255, 255, 0.15);
backdrop-filter: blur(10px);
padding: 20px;
border-radius: 15px;
border: 1px solid rgba(255, 255, 255, 0.2);
}
.cheat-item h4 {
color: white;
margin-bottom: 10px;
font-weight: 600;
}
.cheat-item code {
background: rgba(0, 0, 0, 0.3);
padding: 4px 8px;
border-radius: 5px;
font-size: 0.9rem;
color: white;
}
.highlight {
color: var(--accent-yellow);
font-weight: 600;
}
.footer {
text-align: center;
padding: 40px 20px;
background: var(--bg-secondary);
margin-top: 80px;
border-radius: 20px;
}
.footer p {
color: var(--text-secondary);
margin: 10px 0;
}
.badge {
display: inline-block;
padding: 6px 12px;
background: var(--gradient-experimental);
border-radius: 20px;
font-size: 0.85rem;
font-weight: 600;
margin: 5px;
}
.confetti {
position: fixed;
width: 10px;
height: 10px;
background: var(--accent-purple);
animation: confetti-fall 3s linear forwards;
z-index: 9999;
}
@keyframes confetti-fall {
to {
transform: translateY(100vh) rotate(360deg);
opacity: 0;
}
}
@media (max-width: 768px) {
.hero h1 { font-size: 2rem; }
.command-display { font-size: 0.9rem; padding: 15px 20px; }
.section-title { font-size: 1.8rem; }
.card { padding: 25px; }
.step { padding-left: 80px; }
.step::before { width: 50px; height: 50px; font-size: 1.5rem; }
.comparison-grid { grid-template-columns: 1fr; }
}
</style>
</head>
<body>
<div class="progress-container">
<div class="progress-bar" id="progressBar"></div>
</div>
<div class="hero">
<div class="hero-content">
<div class="experimental-icon">🧪</div>
<h1>ES Modules Experimental!</h1>
<div class="command-display">node --experimental-modules app.js</div>
<p>Enable cutting-edge module support! 🚀</p>
<div class="deprecated-badge">⚠️ DEPRECATED - Use modern approach instead!</div>
</div>
</div>
<div class="container">
<!-- What Is It -->
<section class="section">
<h2 class="section-title">🤔 What Is This Command?</h2>
<div class="card">
<p style="font-size: 1.2rem; margin-bottom: 20px;">
This command was used to enable <span class="highlight">ES Modules (ESM)</span> support in older versions of Node.js when it was still <strong>experimental</strong>! 🧪
</p>
<div class="warning">
<strong>Important Update:</strong> This flag is <strong>DEPRECATED</strong> and no longer needed in Node.js 13.2.0+! Modern Node.js has native ESM support built-in.
</div>
<p style="margin: 20px 0;">
Think of it like training wheels for ES Modules! 🚲 Back in the day (Node.js 8.5.0 - 13.1.0), this flag told Node.js: "Hey, I want to use modern <code>import</code>/<code>export</code> syntax instead of old-school <code>require()</code>!"
</p>
<div class="info">
<strong>Breaking It Down:</strong>
<ul style="margin-left: 30px; margin-top: 10px; line-height: 2;">
<li><code>node</code> - The Node.js runtime</li>
<li><code class="code-flag">--experimental-modules</code> - Flag to enable ESM (old way)</li>
<li><code>app.js</code> - Your JavaScript file</li>
<li>Required <code>.mjs</code> extension or <code>"type": "module"</code> in package.json</li>
</ul>
</div>
<div style="margin-top: 30px;">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">What are ES Modules? 🔍</h3>
<p>ES Modules are the modern JavaScript standard for organizing code into reusable pieces using <code>import</code> and <code>export</code> - cleaner than CommonJS <code>require()</code>!</p>
</div>
</div>
</section>
<!-- Timeline -->
<section class="section">
<h2 class="section-title">📅 Historical Timeline</h2>
<div class="card">
<div class="timeline">
<div class="timeline-item">
<div class="timeline-dot"></div>
<div class="timeline-content">
<h4 style="color: var(--accent-purple);">Node.js 8.5.0 (2017)</h4>
<p>Flag introduced as experimental feature</p>
</div>
</div>
<div class="timeline-item">
<div class="timeline-dot"></div>
<div class="timeline-content">
<h4 style="color: var(--accent-blue);">Node.js 12.x (2019)</h4>
<p>Still experimental, required .mjs files</p>
</div>
</div>
<div class="timeline-item">
<div class="timeline-dot"></div>
<div class="timeline-content">
<h4 style="color: var(--accent-green);">Node.js 13.2.0 (2019)</h4>
<p>Flag removed! ESM support became stable</p>
</div>
</div>
<div class="timeline-item">
<div class="timeline-dot"></div>
<div class="timeline-content">
<h4 style="color: var(--accent-yellow);">Today (Node.js 14+)</h4>
<p>Native ESM support - no flag needed!</p>
</div>
</div>
</div>
</div>
</section>
<!-- Why Use It -->
<section class="section">
<h2 class="section-title">✨ Why Was It Used?</h2>
<div class="card">
<div class="feature-grid">
<div class="feature-card">
<div class="feature-icon">📦</div>
<div class="feature-title">Modern Syntax</div>
<p style="color: var(--text-secondary);">Use import/export!</p>
</div>
<div class="feature-card">
<div class="feature-icon">🔬</div>
<div class="feature-title">Early Access</div>
<p style="color: var(--text-secondary);">Test new features!</p>
</div>
<div class="feature-card">
<div class="feature-icon">🌐</div>
<div class="feature-title">Browser Compatibility</div>
<p style="color: var(--text-secondary);">Same syntax everywhere!</p>
</div>
<div class="feature-card">
<div class="feature-icon">🚀</div>
<div class="feature-title">Future-Ready</div>
<p style="color: var(--text-secondary);">Prepare for standard!</p>
</div>
<div class="feature-card">
<div class="feature-icon">🔄</div>
<div class="feature-title">Static Analysis</div>
<p style="color: var(--text-secondary);">Better tree-shaking!</p>
</div>
<div class="feature-card">
<div class="feature-icon">✅</div>
<div class="feature-title">Async Loading</div>
<p style="color: var(--text-secondary);">Top-level await!</p>
</div>
</div>
</div>
</section>
<!-- How It Works -->
<section class="section">
<h2 class="section-title">⚙️ How Did It Work?</h2>
<div class="card">
<div class="steps">
<div class="step">
<h3>Step 1: Enable Flag</h3>
<p>Run Node.js with --experimental-modules flag.</p>
</div>
<div class="step">
<h3>Step 2: Use .mjs Extension</h3>
<p>Rename files to .mjs or set "type": "module" in package.json.</p>
</div>
<div class="step">
<h3>Step 3: Write ES Module Code</h3>
<p>Use import/export syntax instead of require().</p>
</div>
<div class="step">
<h3>Step 4: Node.js Parses</h3>
<p>V8 engine recognizes and loads ES modules.</p>
</div>
<div class="step">
<h3>Step 5: Module Resolution</h3>
<p>Resolves imports using ESM algorithm.</p>
</div>
<div class="step">
<h3>Step 6: Execution</h3>
<p>Runs your modern JavaScript code! 🎉</p>
</div>
</div>
</div>
</section>
<!-- Live Demo -->
<section class="section">
<h2 class="section-title">🎮 Old vs New Approach</h2>
<div class="demo-container">
<h3 style="margin-bottom: 20px; font-size: 1.5rem;">See The Evolution! 🚀</h3>
<div style="margin-top: 30px;">
<button class="demo-button" onclick="simulateOldWay()">
<span>🕰️</span>
<span>Old Way (Experimental)</span>
</button>
<button class="demo-button" onclick="simulateNewWay()">
<span>✨</span>
<span>Modern Way (Stable)</span>
</button>
<button class="demo-button" onclick="simulateComparison()">
<span>🔄</span>
<span>Side-by-Side</span>
</button>
</div>
<div class="terminal" id="terminal">
<div class="terminal-line">
<span class="terminal-prompt">$</span>
<span style="color: var(--text-secondary);"> Ready to explore ES Modules...</span>
</div>
</div>
</div>
</section>
<!-- Code Breakdown -->
<section class="section">
<h2 class="section-title">💻 Code Examples</h2>
<div class="card">
<div class="tabs">
<button class="tab active" onclick="switchTab('old')">Old Way (Deprecated)</button>
<button class="tab" onclick="switchTab('modern')">Modern Way (Use This!)</button>
<button class="tab" onclick="switchTab('commonjs')">CommonJS vs ESM</button>
<button class="tab" onclick="switchTab('migration')">Migration Guide</button>
</div>
<div id="old" class="tab-content active">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">Old Experimental Way (Don't Use!)</h3>
<div class="code-block">
<div class="code-header">
<div class="terminal-dots">
<div class="terminal-dot dot-red"></div>
<div class="terminal-dot dot-yellow"></div>
<div class="terminal-dot dot-green"></div>
</div>
<button class="copy-btn" onclick="copyCode('old-code')">📋 Copy</button>
</div>
<pre><code id="old-code"><span class="code-comment"># Old way (Node.js 8.5 - 13.1)</span>
node --experimental-modules app.mjs
<span class="code-comment"># Required .mjs extension</span>
<span class="code-comment">// app.mjs</span>
<span class="code-keyword">import</span> { greet } <span class="code-keyword">from</span> <span class="code-string">'./utils.mjs'</span>;
greet(<span class="code-string">'World'</span>);
<span class="code-comment">// utils.mjs</span>
<span class="code-keyword">export</span> <span class="code-keyword">function</span> greet(name) {
console.log(<span class="code-string">`Hello, ${name}!`</span>);
}</code></pre>
</div>
<div class="warning" style="margin-top: 15px;">
<strong>Deprecated:</strong> This approach is outdated and no longer recommended!
</div>
</div>
<div id="modern" class="tab-content">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">Modern Way (Recommended!)</h3>
<div class="code-block">
<div class="code-header">
<div class="terminal-dots">
<div class="terminal-dot dot-red"></div>
<div class="terminal-dot dot-yellow"></div>
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<pre><code id="modern-code"><span class="code-comment"># Modern way (Node.js 13.2+)</span>
node app.js <span class="code-comment"># No flag needed!</span>
<span class="code-comment">// package.json</span>
{
<span class="code-string">"type"</span>: <span class="code-string">"module"</span> <span class="code-comment">// Enable ESM</span>
}
<span class="code-comment">// app.js (regular .js extension!)</span>
<span class="code-keyword">import</span> { greet } <span class="code-keyword">from</span> <span class="code-string">'./utils.js'</span>;
greet(<span class="code-string">'World'</span>);
<span class="code-comment">// utils.js</span>
<span class="code-keyword">export</span> <span class="code-keyword">function</span> greet(name) {
console.log(<span class="code-string">`Hello, ${name}!`</span>);
}</code></pre>
</div>
<div class="success" style="margin-top: 15px;">
<strong>Recommended:</strong> This is the modern, stable approach!
</div>
</div>
<div id="commonjs" class="tab-content">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">CommonJS vs ES Modules</h3>
<div class="comparison-grid">
<div class="comparison-item old">
<h4 style="color: var(--accent-red);">CommonJS (Old)</h4>
<div class="code-block" style="margin-top: 15px;">
<pre><code><span class="code-comment">// Exporting</span>
module.exports = { greet };
<span class="code-comment">// Importing</span>
<span class="code-keyword">const</span> { greet } = <span class="code-keyword">require</span>(<span class="code-string">'./utils'</span>);
<span class="code-comment">// Synchronous loading</span>
<span class="code-comment">// Dynamic require possible</span></code></pre>
</div>
</div>
<div class="comparison-item new">
<h4 style="color: var(--accent-green);">ES Modules (Modern)</h4>
<div class="code-block" style="margin-top: 15px;">
<pre><code><span class="code-comment">// Exporting</span>
<span class="code-keyword">export</span> { greet };
<span class="code-comment">// Importing</span>
<span class="code-keyword">import</span> { greet } <span class="code-keyword">from</span> <span class="code-string">'./utils.js'</span>;
<span class="code-comment">// Asynchronous loading</span>
<span class="code-comment">// Static imports (better optimization)</span></code></pre>
</div>
</div>
</div>
</div>
<div id="migration" class="tab-content">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">Migration Guide</h3>
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<pre><code id="migration-code"><span class="code-comment"># Step 1: Update package.json</span>
{
<span class="code-string">"type"</span>: <span class="code-string">"module"</span>
}
<span class="code-comment"># Step 2: Replace require with import</span>
<span class="code-comment">// Before:</span>
<span class="code-keyword">const</span> fs = <span class="code-keyword">require</span>(<span class="code-string">'fs'</span>);
<span class="code-comment">// After:</span>
<span class="code-keyword">import</span> fs <span class="code-keyword">from</span> <span class="code-string">'fs'</span>;
<span class="code-comment"># Step 3: Replace module.exports</span>
<span class="code-comment">// Before:</span>
module.exports = { myFunc };
<span class="code-comment">// After:</span>
<span class="code-keyword">export</span> { myFunc };
<span class="code-comment"># Step 4: Add .js extensions to imports</span>
<span class="code-keyword">import</span> { util } <span class="code-keyword">from</span> <span class="code-string">'./util.js'</span>; <span class="code-comment">// Required!</span></code></pre>
</div>
</div>
</div>
</section>
<!-- Common Mistakes -->
<section class="section">
<h2 class="section-title">❌ Common Mistakes</h2>
<div class="card">
<div class="accordion">
<div class="accordion-item">
<div class="accordion-header" onclick="toggleAccordion(this)">
<span><strong>1. Using Flag in Modern Node.js</strong></span>
<span class="accordion-icon">▼</span>
</div>
<div class="accordion-content">
<div class="accordion-body">
<div class="warning">
<strong>Problem:</strong> Using --experimental-modules in Node.js 13.2+!
</div>
<div class="success" style="margin-top: 15px;">
<strong>Solution:</strong> Remove the flag! Just use <code>"type": "module"</code> in package.json.
</div>
</div>
</div>
</div>
<div class="accordion-item">
<div class="accordion-header" onclick="toggleAccordion(this)">
<span><strong>2. Missing File Extensions</strong></span>
<span class="accordion-icon">▼</span>
</div>
<div class="accordion-content">
<div class="accordion-body">
<div class="warning">
<strong>Problem:</strong> <code>import utils from './utils'</code> without .js extension!
</div>
<div class="success" style="margin-top: 15px;">
<strong>Solution:</strong> Always include: <code>import utils from './utils.js'</code>
</div>
</div>
</div>
</div>
<div class="accordion-item">
<div class="accordion-header" onclick="toggleAccordion(this)">
<span><strong>3. Mixing CommonJS and ESM</strong></span>
<span class="accordion-icon">▼</span>
</div>
<div class="accordion-content">
<div class="accordion-body">
<div class="warning">
<strong>Problem:</strong> Using require() in ESM files or vice versa!
</div>
<div class="success" style="margin-top: 15px;">
<strong>Solution:</strong> Choose one system per file. Use .cjs for CommonJS if needed.
</div>
</div>
</div>
</div>
</div>
</div>
</section>
<!-- Pro Tips -->
<section class="section">
<h2 class="section-title">🚀 Pro Tips</h2>
<div class="card">
<div class="tip">
<strong>Check Node.js version</strong> - Run <code>node --version</code>. If 13.2+, skip the flag!
</div>
<div class="tip">
<strong>Use "type": "module"</strong> - Add to package.json for project-wide ESM support!
</div>
<div class="tip">
<strong>File extensions matter</strong> - .mjs = always ESM, .cjs = always CommonJS, .js = depends on package.json
</div>
<div class="tip">
<strong>Top-level await</strong> - ESM allows <code>await</code> at the top level (no async wrapper needed)!
</div>
<div class="tip">
<strong>Dynamic imports</strong> - Use <code>await import('./module.js')</code> for conditional loading!
</div>
<div class="tip">
<strong>Named exports preferred</strong> - <code>export { func }</code> is better than <code>export default</code> for tree-shaking!
</div>
</div>
</section>
<!-- Quiz -->
<section class="section">
<h2 class="section-title">🎯 Knowledge Check Quiz</h2>
<div class="quiz-container">
<p style="margin-bottom: 30px; font-size: 1.1rem;">Test your understanding! 🧠</p>
<div class="quiz-question">
<h3>Question 1: Is --experimental-modules still needed?</h3>
<div class="quiz-options">
<div class="quiz-option" onclick="checkAnswer(this, false, 1)">A) Yes, always required</div>
<div class="quiz-option" onclick="checkAnswer(this, true, 1)">B) No, deprecated in Node.js 13.2+</div>
<div class="quiz-option" onclick="checkAnswer(this, false, 1)">C) Only for .mjs files</div>
</div>
<div class="quiz-feedback" id="feedback1"></div>
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<div class="quiz-question">
<h3>Question 2: How to enable ESM in modern Node.js?</h3>
<div class="quiz-options">
<div class="quiz-option" onclick="checkAnswer(this, false, 2)">A) Use --experimental-modules flag</div>
<div class="quiz-option" onclick="checkAnswer(this, true, 2)">B) Add "type": "module" to package.json</div>
<div class="quiz-option" onclick="checkAnswer(this, false, 2)">C) Rename all files to .mjs</div>
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<h3>Question 3: What's required in ESM imports?</h3>
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<div class="quiz-option" onclick="checkAnswer(this, false, 3)">A) Nothing special</div>
<div class="quiz-option" onclick="checkAnswer(this, true, 3)">B) File extensions (.js) must be included</div>
<div class="quiz-option" onclick="checkAnswer(this, false, 3)">C) Use require() instead</div>
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</section>
<!-- Summary Card -->
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<h2 class="section-title">📚 Quick Reference</h2>
<div class="cheat-sheet">
<h3 style="margin-bottom: 20px; font-size: 2rem;">ES Modules Cheat Sheet! 🔖</h3>
<div class="cheat-grid">
<div class="cheat-item">
<h4>🕰️ Old Way</h4>
<p><code>node --experimental-modules app.mjs</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">DEPRECATED</p>
</div>
<div class="cheat-item">
<h4>✨ Modern Way</h4>
<p><code>"type": "module"</code> in package.json</p>
<p style="font-size: 0.85rem; margin-top: 5px;">Recommended!</p>
</div>
<div class="cheat-item">
<h4>📦 Import Syntax</h4>
<p><code>import { x } from './file.js'</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">Include .js!</p>
</div>
<div class="cheat-item">
<h4>📤 Export Syntax</h4>
<p><code>export { myFunc }</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">Named exports</p>
</div>
<div class="cheat-item">
<h4>🔄 Dynamic Import</h4>
<p><code>await import('./module.js')</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">Conditional loading</p>
</div>
<div class="cheat-item">
<h4>⏱️ Top-level Await</h4>
<p><code>const data = await fetch(url)</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">No wrapper needed</p>
</div>
<div class="cheat-item">
<h4>📄 File Extensions</h4>
<p>.mjs = ESM, .cjs = CommonJS</p>
<p style="font-size: 0.85rem; margin-top: 5px;">.js depends on type</p>
</div>
<div class="cheat-item">
<h4>✅ Node Version</h4>
<p>13.2.0+ for stable ESM</p>
<p style="font-size: 0.85rem; margin-top: 5px;">No flag needed</p>
</div>
</div>
</div>
</section>
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<h2 style="font-size: 2rem; margin-bottom: 20px; color: var(--accent-pink);">🎉 Congratulations!</h2>
<p style="font-size: 1.2rem; margin-bottom: 20px;">You now understand <strong>ES Modules history</strong>! 🚀</p>
<div style="margin: 30px 0;">
<span class="badge">🧪 Experimental Expert</span>
<span class="badge">📦 Module Master</span>
<span class="badge">✨ Modern Dev</span>
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